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Corrected vulnerabilities (CVE's) versus ITS# number
by claude.cheret＠external.thalesgroup.com 21 Jun '19

21 Jun '19

Full_Name: Claude CHERET Version: 2.4.46 OS: Linux URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (92.163.84.130) Hi, Can you tel me where I can find information about corrected CVE versus OpenLdap version ? Bests Regards. -- Claude Chéret claude.cheret(a)external.thalesgroup.com

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Re: (ITS#9037) observing crash in mdb_cursor_put()
by myk＠mykzilla.org 21 Jun '19

21 Jun '19

myk(a)mykzilla.org wrote on 2019-06-20 23:39: > myk(a)mykzilla.org wrote on 2019-06-20 23:35: >> I'm unsure if it's related, but with this change to mdb.c, the following >> test program (which resembles Firefox's usage) asserts in >> mdb_cursor_init because rc is MDB_NOTFOUND. > Erm, here's the program without the errant characters: My apologies, I'm unsure why the characters appeared the second time as well. (I tested first by manually removing them, sending the message to myself, and then confirming they didn't appear.) I've saved the program to this GitHub gist: https://gist.github.com/mykmelez/ac75a7ab0a0d09a7d709be63806d01d7 -myk

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Re: (ITS#9037) observing crash in mdb_cursor_put()
by myk＠mykzilla.org 21 Jun '19

21 Jun '19

myk(a)mykzilla.org wrote on 2019-06-20 23:35: > I'm unsure if it's related, but with this change to mdb.c, the following > test program (which resembles Firefox's usage) asserts in > mdb_cursor_init because rc is MDB_NOTFOUND. Erm, here's the program without the errant characters: #include <stdio.h> #include <stdlib.h> #include "lmdb.h" #define E(expr) CHECK((rc = (expr)) == MDB_SUCCESS, #expr) #define CHECK(test, msg) ((test) ? (void)0 : ((void)fprintf(stderr, \ "%s:%d: %s: %s\n", __FILE__, __LINE__, msg, mdb_strerror(rc)), abort())) int main(int argc,char * argv[]) { int rc; MDB_env *env; MDB_dbi dbi; MDB_val key, data; MDB_txn *txn; char sval[] = "foo"; char dval[] = "bar"; E(mdb_env_create(&env)); E(mdb_env_set_maxdbs(env, 2)); E(mdb_env_open(env, "./mytestdb", 0, 0664)); E(mdb_txn_begin(env, NULL, 0, &txn)); E(mdb_dbi_open(txn, "subdb", MDB_CREATE, &dbi)); E(mdb_txn_commit(txn)); key.mv_size = 3; key.mv_data = sval; data.mv_size = 3; data.mv_data = dval; E(mdb_txn_begin(env, NULL, 0, &txn)); E(mdb_put(txn, dbi, &key, &data, 0)); E(mdb_txn_commit(txn)); mdb_dbi_close(env, dbi); mdb_env_close(env); return 0; }

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Re: (ITS#9037) observing crash in mdb_cursor_put()
by myk＠mykzilla.org 21 Jun '19

21 Jun '19

hyc(a)symas.com wrote on 2019-06-19 09:55: > Maybe. For testing purposes you could try something like this > diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c > index 692feaa38b..e41f3bc36a 100644 > --- a/libraries/liblmdb/mdb.c > +++ b/libraries/liblmdb/mdb.c > @@ -7620,7 +7620,8 @@ mdb_cursor_init(MDB_cursor *mc, MDB_txn *txn, MDB_dbi dbi, MDB_xcursor *mx) > mc->mc_xcursor = NULL; > } > if (*mc->mc_dbflag & DB_STALE) { > - mdb_page_search(mc, NULL, MDB_PS_ROOTONLY); > + int rc = mdb_page_search(mc, NULL, MDB_PS_ROOTONLY); > + mdb_cassert(mc, !rc); > } > } I'm unsure if it's related, but with this change to mdb.c, the following test program (which resembles Firefox's usage) asserts in mdb_cursor_init because rc is MDB_NOTFOUND. #include <stdio.h> #include <stdlib.h> #include "lmdb.h" #define E(expr) CHECK((rc = (expr)) == MDB_SUCCESS, #expr) #define CHECK(test, msg) ((test) ? (void)0 : ((void)fprintf(stderr, \ "%s:%d: %s: %s\n", __FILE__, __LINE__, msg, mdb_strerror(rc)), abort())) int main(int argc,char * argv[]) { int rc; MDB_env *env; MDB_dbi dbi; MDB_val key, data; MDB_txn *txn; char sval[] = "foo"; char dval[] = "bar"; E(mdb_env_create(&env)); E(mdb_env_set_maxdbs(env, 2)); E(mdb_env_open(env, "./mytestdb", 0, 0664)); E(mdb_txn_begin(env, NULL, 0, &txn)); E(mdb_dbi_open(txn, "subdb", MDB_CREATE, &dbi)); E(mdb_txn_commit(txn)); key.mv_size = 3; key.mv_data = sval; data.mv_size = 3; data.mv_data = dval; E(mdb_txn_begin(env, NULL, 0, &txn)); E(mdb_put(txn, dbi, &key, &data, 0)); E(mdb_txn_commit(txn)); mdb_dbi_close(env, dbi); mdb_env_close(env); return 0; } Without the change to mdb.c, however, the program appears to work correctly. -myk

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Re: (ITS#9039) key corruption using mdb_put and differing data
by hyc＠symas.com 20 Jun '19

20 Jun '19

lmdb(a)pluckeye.net wrote: > Full_Name: Jonny Wilkes > Version: 2.4.2 > OS: Linux > URL: ftp://ftp.openldap.org/incoming/ > Submission from: (NULL) (67.160.82.31) > > > The following code shows key corruption. Yes, because you've misused the API. > > I am probably using the API wrong, but I don't see how. I apologize in advance > for not having a clue. Read the Note http://www.lmdb.tech/doc/group__mdb.html#ga8bf10cd91d3f3a83a34d04ce6b07992d Further comments below. > And now, on to the test. It can be compiled and run like so: > > gcc t1.c -llmdb && ./a.out > > --------- t1.c starts here --------- > /* > > The output of this program using liblmdb0 v0.9.21-1 on Ubuntu is: > > --- dump --- > key12345 > key67890 > --- dump --- > key12345 > y12345 > > Why? What happened to key67890? > > */ > > #include <lmdb.h> > #if USE_SOURCE > #include "midl.c" > #include "mdb.c" > #endif > #include <stdio.h> > #include <string.h> > #include <unistd.h> > > #define P(K) printf("%s\n", (char *)K.mv_data) > > #define X(x) do { int _x = x; if (_x) fprintf(stderr, "%d %s\n", _x, > mdb_strerror(_x)); } while (0) > > const char *path = "/tmp/lmdb-why.tmp"; > MDB_env *env; > > /* > * setup creates /tmp/lmdb-why.tmp with 2 keys with the data "hey": > * > * 1. key12345 : hey > * 2. key67890 : hey > */ > int > setup(void) > { > unlink(path); > if (!env) { > X(mdb_env_create(&env)); > X(mdb_env_open(env, path, MDB_NOSUBDIR, 0664)); > } > > MDB_txn *txn; X(mdb_txn_begin(env, NULL, 0, &txn)); > MDB_dbi dbi; X(mdb_dbi_open(txn, NULL, 0, &dbi)); > > const char *keys[] = { > "key12345", > "key67890" > }; > for (unsigned i = 0; i < 2; ++i) { > MDB_val key, data; > key.mv_data = (void *)keys[i]; > key.mv_size = strlen(keys[i])+1; > data.mv_data = "hey"; > data.mv_size = 4; > X(mdb_put(txn, dbi, &key, &data, 0)); > } > X(mdb_txn_commit(txn)); > return 0; > } > > int > dump(void) > { > printf("--- dump ---\n"); > > MDB_txn *txn; X(mdb_txn_begin(env, NULL, 0, &txn)); > MDB_dbi dbi; X(mdb_dbi_open(txn, NULL, 0, &dbi)); > MDB_cursor *cursor; X(mdb_cursor_open(txn, dbi, &cursor)); > > MDB_val key; > int rc; > while ((rc = mdb_cursor_get(cursor, &key, NULL, MDB_NEXT)) == 0) { > P(key); > } > > mdb_cursor_close(cursor); > if (MDB_NOTFOUND != rc) > return rc; > mdb_txn_abort(txn); > return 0; > } > > /* > * change_data change the data for each key to "there" using mdb_put. > * After it completes, the keys are corrupt. > */ > int > change_data(void) > { > MDB_txn *txn; X(mdb_txn_begin(env, NULL, 0, &txn)); > MDB_dbi dbi; X(mdb_dbi_open(txn, NULL, 0, &dbi)); > MDB_cursor *cursor; X(mdb_cursor_open(txn, dbi, &cursor)); > > MDB_val key; > int rc; > while ((rc = mdb_cursor_get(cursor, &key, NULL, MDB_NEXT)) == 0) { > MDB_val data; > data.mv_data = (void *)"there"; > data.mv_size = 6; /* ! */ > X(mdb_put(txn, dbi, &key, &data, 0)); As documented, the key returned by mdb_cursor_get is only valid until the next update operation. Since you've called mdb_put here, the key is altered while the put is executing, and so you get your corruption. You have to copy the key if you want this particular code to work. But even so, you're not using the API optimally. Since you have a cursor already, you should be using mdb_cursor_put instead. > } > mdb_cursor_close(cursor); > if (MDB_NOTFOUND != rc) > return rc; > > X(mdb_txn_commit(txn)); > return 0; > } > > int main(void) > { > X(setup()); > X(dump()); > X(change_data()); > X(dump()); > return 0; > } Closing this ITS. -- -- Howard Chu CTO, Symas Corp. http://www.symas.com Director, Highland Sun http://highlandsun.com/hyc/ Chief Architect, OpenLDAP http://www.openldap.org/project/

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(ITS#9039) key corruption using mdb_put and differing data
by lmdb＠pluckeye.net 20 Jun '19

20 Jun '19

Full_Name: Jonny Wilkes Version: 2.4.2 OS: Linux URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (67.160.82.31) The following code shows key corruption. I am probably using the API wrong, but I don't see how. I apologize in advance for not having a clue. And now, on to the test. It can be compiled and run like so: gcc t1.c -llmdb && ./a.out --------- t1.c starts here --------- /* The output of this program using liblmdb0 v0.9.21-1 on Ubuntu is: --- dump --- key12345 key67890 --- dump --- key12345 y12345 Why? What happened to key67890? */ #include <lmdb.h> #if USE_SOURCE #include "midl.c" #include "mdb.c" #endif #include <stdio.h> #include <string.h> #include <unistd.h> #define P(K) printf("%s\n", (char *)K.mv_data) #define X(x) do { int _x = x; if (_x) fprintf(stderr, "%d %s\n", _x, mdb_strerror(_x)); } while (0) const char *path = "/tmp/lmdb-why.tmp"; MDB_env *env; /* * setup creates /tmp/lmdb-why.tmp with 2 keys with the data "hey": * * 1. key12345 : hey * 2. key67890 : hey */ int setup(void) { unlink(path); if (!env) { X(mdb_env_create(&env)); X(mdb_env_open(env, path, MDB_NOSUBDIR, 0664)); } MDB_txn *txn; X(mdb_txn_begin(env, NULL, 0, &txn)); MDB_dbi dbi; X(mdb_dbi_open(txn, NULL, 0, &dbi)); const char *keys[] = { "key12345", "key67890" }; for (unsigned i = 0; i < 2; ++i) { MDB_val key, data; key.mv_data = (void *)keys[i]; key.mv_size = strlen(keys[i])+1; data.mv_data = "hey"; data.mv_size = 4; X(mdb_put(txn, dbi, &key, &data, 0)); } X(mdb_txn_commit(txn)); return 0; } int dump(void) { printf("--- dump ---\n"); MDB_txn *txn; X(mdb_txn_begin(env, NULL, 0, &txn)); MDB_dbi dbi; X(mdb_dbi_open(txn, NULL, 0, &dbi)); MDB_cursor *cursor; X(mdb_cursor_open(txn, dbi, &cursor)); MDB_val key; int rc; while ((rc = mdb_cursor_get(cursor, &key, NULL, MDB_NEXT)) == 0) { P(key); } mdb_cursor_close(cursor); if (MDB_NOTFOUND != rc) return rc; mdb_txn_abort(txn); return 0; } /* * change_data change the data for each key to "there" using mdb_put. * After it completes, the keys are corrupt. */ int change_data(void) { MDB_txn *txn; X(mdb_txn_begin(env, NULL, 0, &txn)); MDB_dbi dbi; X(mdb_dbi_open(txn, NULL, 0, &dbi)); MDB_cursor *cursor; X(mdb_cursor_open(txn, dbi, &cursor)); MDB_val key; int rc; while ((rc = mdb_cursor_get(cursor, &key, NULL, MDB_NEXT)) == 0) { MDB_val data; data.mv_data = (void *)"there"; data.mv_size = 6; /* ! */ X(mdb_put(txn, dbi, &key, &data, 0)); } mdb_cursor_close(cursor); if (MDB_NOTFOUND != rc) return rc; X(mdb_txn_commit(txn)); return 0; } int main(void) { X(setup()); X(dump()); X(change_data()); X(dump()); return 0; }

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Re: (ITS#9037) observing crash in mdb_cursor_put()
by hyc＠symas.com 19 Jun '19

19 Jun '19

myk(a)mykzilla.org wrote: > hyc(a)symas.com wrote on 2019-06-18 01:30: >> There is no issue with mdb_cursor_put then. The question is why didn't mdb_page_search find the DBI's root node? > Would it be useful for mdb_cursor_init to return the result code of > mdb_page_search, and for mdb_put to then return that code if it isn't > MDB_SUCCESS? Maybe. For testing purposes you could try something like this diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c index 692feaa38b..e41f3bc36a 100644 --- a/libraries/liblmdb/mdb.c +++ b/libraries/liblmdb/mdb.c @@ -7620,7 +7620,8 @@ mdb_cursor_init(MDB_cursor *mc, MDB_txn *txn, MDB_dbi dbi, MDB_xcursor *mx) mc->mc_xcursor = NULL; } if (*mc->mc_dbflag & DB_STALE) { - mdb_page_search(mc, NULL, MDB_PS_ROOTONLY); + int rc = mdb_page_search(mc, NULL, MDB_PS_ROOTONLY); + mdb_cassert(mc, !rc); } } I suspect the problem will simply be that you've used an invalid DBI. > > That wouldn't resolve the problem, but it might avoid the crash and > provide some insight into the failure (if mdb_page_search is actually > returning a failure code when it doesn't find the DBI's root node). > > -myk > > > > > -- -- Howard Chu CTO, Symas Corp. http://www.symas.com Director, Highland Sun http://highlandsun.com/hyc/ Chief Architect, OpenLDAP http://www.openldap.org/project/

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Re: (ITS#9037) observing crash in mdb_cursor_put()
by myk＠mykzilla.org 19 Jun '19

19 Jun '19

hyc(a)symas.com wrote on 2019-06-18 01:30: > There is no issue with mdb_cursor_put then. The question is why didn't mdb_page_search find the DBI's root node? Would it be useful for mdb_cursor_init to return the result code of mdb_page_search, and for mdb_put to then return that code if it isn't MDB_SUCCESS? That wouldn't resolve the problem, but it might avoid the crash and provide some insight into the failure (if mdb_page_search is actually returning a failure code when it doesn't find the DBI's root node). -myk

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Re: (ITS#9037) observing crash in mdb_cursor_put()
by grobins＠pulsesecure.net 18 Jun '19

18 Jun '19

--_000_MN2PR06MB55017A7261FA27380778753BAFEA0MN2PR06MB5501namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable <repost since the previous message came as 64 encoded, apologies> Hello Howard, we are not able to reproduce the issue consistently so test code is not ava= ilable at this time, and I do believe this issue will be present in the lat= est code as well since Myk also reported the same.. Attaching analysis fro= m our side, hope it helps. The call stack what we have seen is, #0 0x0011b62e in mdb_cursor_put (mc=3D0xffe52d18, key=3D0xffe52e74, dat= a=3D0xffe52e6c, flags=3D0) at mdb.c:6688 #1 0x0011c8ec in mdb_put (txn=3D0xdc13f008, dbi=3D2, key=3D0xffe52e74, = data=3D0xffe52e6c, flags=3D0) at mdb.c:8771 #2 0x00b792b8 in LMDB::LMDBContext::createSession (this=3D0x80ca418, si= d=3D0x8297be4 "sidebf3708f0fd9fcb8e062529da47adf51402dfc4600000000+") at lm= dbint.cc:460 #3 0x08053564 in updateLMDB (request=3D..., forward=3D@0xffe5315f) at s= essionserver.cc:1075 #4 processRequestWithoutResponse (request=3D..., forward=3D@0xffe5315f)= at sessionserver.cc:1160 #5 0x08056a80 in processRequest (this=3D0x80b2ac0, fd=3D33) at sessions= erver.cc:1189 #6 readFromSock (this=3D0x80b2ac0, fd=3D33) at sessionserver.cc:1342 #7 SockHandler::ioReady (this=3D0x80b2ac0, fd=3D33) at sessionserver.cc= :1455 #8 0x00ba2592 in runCoreDispatcher (default_t=3D<value optimized out>, = flags=3D-1) at fds.cc:889 #9 0x00ba2ff7 in DSEvntFds::runDispatcher () at fds.cc:945 #10 0x080559c6 in main () at sessionserver.cc:1739 Here it is helpful to examine frames #0 and #1 in detail in relation to the= relevant source code /libraries/liblmdb/mdb.c. Frame #1 #1 0x0011c8ec in mdb_put (txn=3D0xdc13f008, dbi=3D2, key=3D0xffe52e74, dat= a=3D0xffe52e6c, flags=3D0) at mdb.c:8771 mc =3D {mc_next =3D 0x0, mc_backup =3D 0x0, mc_xcursor =3D 0x0, mc_= txn =3D 0xdc13f008, mc_dbi =3D 2, mc_db =3D 0xdc13f088, mc_dbx =3D 0xe12150= 38, mc_dbflag =3D 0xdc1cf09a "\033", '\032' <repeats 51 times>, mc_snum =3D= 0, mc_top =3D 0, mc_flags =3D 0, mc_pg =3D {0x0, 0x80b2ac0, 0xffe52d68, 0x= 28afce, 0xdc13f008, 0x80ce9b0, 0xffe52dc8, 0x4c5ff4, 0x2b, 0x80b2ac0, 0xffe= 52d98, 0x49209a, 0x2b, 0x4c5ff4, 0x2121cb, 0x21576c, 0x8297d34, 0x3497af, 0= x21576c, 0x21316a, 0x8297d34, 0x80ac7b0, 0x1e, 0x46eed6, 0x2b, 0x0, 0x80ce9= b0, 0x4c5ff4, 0x80ac7b0, 0x8297d34, 0xffe52df8, 0x46fb96}, mc_ki =3D {0, 20= 89, 51120, 2058, 30, 0, 16796, 17, 11760, 65509, 3, 0, 32040, 2089, 30, 0, = 0, 0, 0, 0, 3, 0, 24564, 76, 51120, 2058, 10944, 2059, 11800, 65509, 64758,= 70}} <-------- mx =3D {mx_cursor =3D {mc_next =3D 0x38, mc_backup =3D 0x3, mc_xcur= sor =3D 0x0, mc_txn =3D 0x0, mc_dbi =3D 0, mc_db =3D 0x28, mc_dbx =3D 0x0, = mc_dbflag =3D 0x0, mc_snum =3D 3, mc_top =3D 0, mc_flags =3D 17, mc_pg =3D = {0x3a93d8, 0x10, 0x0, 0x18, 0x3a93a0, 0x0, 0x3a93d0, 0x289abe, 0x3a93a0, 0x= ffe52d3f, 0xffe52c68, 0x28afce, 0xffe52dbc, 0xffe52db4, 0x3, 0x4c5ff4, 0x11= , 0x36c99b, 0x6e, 0x77, 0x7c, 0x5b, 0x38, 0x289abe, 0x0, 0x0, 0x0, 0x28, 0x= 0, 0x0, 0x3, 0x10}, mc_ki =3D {37848, 58, 51611, 54, 110, 0, 119, 0, 124, 0= , 91, 0, 58, 0, 39614, 40, 0, 0, 0, 0, 0, 0, 160, 0, 0, 0, 2, 0, 18, 0, 136= , 0}}, mx_db =3D {md_pad =3D 3838936, md_flags =3D 51611, md_depth =3D 54, = md_branch_pages =3D 110, md_leaf_pages =3D 119, md_overflow_pages =3D 124, = md_entries =3D 91, md_root =3D 56}, mx_dbx =3D {md_name =3D {mv_size =3D 6,= mv_data =3D 0x0}, md_cmp =3D 0, md_dcmp =3D 0, md_rel =3D 0x40, md_relctx = =3D 0x0}, mx_dbflag =3D 0 '\000'} rc =3D 0 And source code for mdb_put() is from mdb.c int mdb_put(MDB_txn *txn, MDB_dbi dbi, MDB_val *key, MDB_val *data, unsigned int flags) { MDB_cursor mc; MDB_xcursor mx; int rc; if (!key || !data || !TXN_DBI_EXIST(txn, dbi, DB_USRVALID)) return EINVAL; if (flags & ~(MDB_NOOVERWRITE|MDB_NODUPDATA|MDB_RESERVE|MDB= _APPEND|MDB_APPENDDUP)) return EINVAL; if (txn->mt_flags & (MDB_TXN_RDONLY|MDB_TXN_BLOCKED)) return (txn->mt_flags & MDB_TXN_RDONLY) ? E= ACCES : MDB_BAD_TXN; mdb_cursor_init(&mc, txn, dbi, &mx); <-------- see source c= ode below mc.mc_next =3D txn->mt_cursors[dbi]; txn->mt_cursors[dbi] =3D &mc; rc =3D mdb_cursor_put(&mc, key, data, flags); <-------- see= Frame #0 txn->mt_cursors[dbi] =3D mc.mc_next; return rc; } Source Code For mdb_cursor_init() From mdb.c /** Initialize a cursor for a given transaction and database. */ static voi= d mdb_cursor_init(MDB_cursor *mc, MDB_txn *txn, MDB_dbi dbi, MDB_xcursor *m= x) { mc->mc_next =3D NULL; mc->mc_backup =3D NULL; mc->mc_dbi =3D dbi; mc->mc_txn =3D txn; mc->mc_db =3D &txn->mt_dbs[dbi]; mc->mc_dbx =3D &txn->mt_dbxs[dbi]; mc->mc_dbflag =3D &txn->mt_dbflags[dbi]; mc->mc_snum =3D 0; <-------- mc->mc_top =3D 0; <-------- mc->mc_pg[0] =3D 0; <-------- mc->mc_ki[0] =3D 0; mc->mc_flags =3D 0; if (txn->mt_dbs[dbi].md_flags & MDB_DUPSORT) { mdb_tassert(txn, mx !=3D NULL); mc->mc_xcursor =3D mx; mdb_xcursor_init0(mc); } else { mc->mc_xcursor =3D NULL; } if (*mc->mc_dbflag & DB_STALE) { <-------- false *mc->mc_db= flag =3D 27, DB_STALE =3D 0x02 /**< Named-DB record is old= er than txnID */ mdb_page_search(mc, NULL, MDB_PS_ROOTONLY); } } >From this we know that when mdb_cursor_put() is called, the following value= s remain assigned: mc->mc_snum =3D 0; <-------- mc->mc_top =3D 0; <-------- mc->mc_pg[0] =3D 0; <-------- and its noted these two values still have their initial values at the time = of the segmentation fault. (gdb) fr 0 #0 0x0011b62e in mdb_cursor_put (mc=3D0xffe52d18, key=3D0xffe52e74, data=3D= 0xffe52e6c, flags=3D0) at mdb.c:6688 6688 in mdb.c (gdb) p mc->mc_top $1 =3D 0 (gdb) p mc->mc_pg[mc->mc_top] $19 =3D (MDB_page *) 0x0 Let us consider how the path taken through mdb_cursor_put() could account f= or these null variable values which result in a segmentation fault. Frame #0 #0 0x0011b62e in mdb_cursor_put (mc=3D0xffe52d18, key=3D0xffe52e74, data= =3D0xffe52e6c, flags=3D0) at mdb.c:6688 <-------- flags =3D 0 env =3D 0x80ce9b0 leaf =3D <value optimized out> fp =3D <value optimized out> mp =3D 0x38 sub_root =3D 0x0 fp_flags =3D <value optimized out> xdata =3D {mv_size =3D 3838880, mv_data =3D 0xdc1cf09a} rdata =3D 0xffe52e6c dkey =3D {mv_size =3D 0, mv_data =3D 0x3a93cc} olddata =3D {mv_size =3D 22, mv_data =3D 0x36c820} dummy =3D {md_pad =3D 22, md_flags =3D 11128, md_depth =3D 65509, m= d_branch_pages =3D 16, md_leaf_pages =3D 1507329, md_overflow_pages =3D 0, = md_entries =3D 3838928, md_root =3D 3833844} do_sub =3D 0 insert_key =3D -30798 <-------- #define MDB_NOTFOUND (-307= 98) insert_data =3D -30798 <-------- #define MDB_NOTFOUND (-3079= 8) mcount =3D 0 dcount =3D 0 nospill =3D 0 <-------- nsize =3D <value optimized out> rc =3D 0 rc2 =3D <value optimized out> nflags =3D 0 <-------- __func__ =3D "mdb_cursor_put" We know that mc->mc_top and mc->mc_pg[0] were initialized to 0 in mdb_curso= r_init(). As my annotations of the source code below suggest, careful analy= sis reveals that the paths actually taken through mdb_cursor_put() do not m= odify these assignments. Excerpted Source Code For mdb_cursor_put() From mdb.c int mdb_cursor_put(MDB_cursor *mc, MDB_val *key, MDB_val *data, unsigned int flags) { MDB_env *env; MDB_node *leaf =3D NULL; MDB_page *fp, *mp, *sub_root =3D NULL; uint16_t fp_flags; MDB_val xdata, *rdata, dkey, o= lddata; MDB_db dummy; int do_sub =3D 0, insert_key, insert_data; unsigned int mcount =3D 0, dcount =3D 0, nospill; size_t nsize; int rc, rc2; unsigned int nflags; DKBUF; if (mc =3D=3D NULL || key =3D=3D NULL) return EINVAL; env =3D mc->mc_txn->mt_env; /* Check this first so counter will always be zero on any * early failures. */ if (flags & MDB_MULTIPLE) { dcount =3D data[1].mv_size; data[1].mv_size =3D 0; if (!F_ISSET(mc->mc_db->md_flags, MDB_DUPFI= XED)) return MDB_INCOMPATIBLE; } nospill =3D flags & MDB_NOSPILL; flags &=3D ~MDB_NOSPILL; if (mc->mc_txn->mt_flags & (MDB_TXN_RDONLY|MDB_TXN_BLOCKED)= ) return (mc->mc_txn->mt_flags & MDB_TXN_RDON= LY) ? EACCES : MDB_BAD_TXN; if (key->mv_size-1 >=3D ENV_MAXKEY(env)) return MDB_BAD_VALSIZE; #if SIZE_MAX > MAXDATASIZE if (data->mv_size > ((mc->mc_db->md_flags & MDB_DUPSORT) ? = ENV_MAXKEY(env) : MAXDATASIZE)) return MDB_BAD_VALSIZE; #else if ((mc->mc_db->md_flags & MDB_DUPSORT) && data->mv_size > = ENV_MAXKEY(env)) return MDB_BAD_VALSIZE; #endif DPRINTF(("=3D=3D> put db %d key [%s], size %"Z"u, data size= %"Z"u", DDBI(mc), DKEY(key), key ? key->mv_size : 0= , data->mv_size)); dkey.mv_size =3D 0; if (flags =3D=3D MDB_CURRENT) { <-------- false flags =3D 0 if (!(mc->mc_flags & C_INITIALIZED)) return EINVAL; rc =3D MDB_SUCCESS; } else if (mc->mc_db->md_root =3D=3D P_INVALID) { <--------= false, mc->mc_db->md_root =3D 68 /* new database, cursor has nothing to poin= t to */ mc->mc_snum =3D 0; mc->mc_top =3D 0; mc->mc_flags &=3D ~C_INITIALIZED; rc =3D MDB_NO_ROOT; } else { <-------- executed int exact =3D 0; MDB_val d2; if (flags & MDB_APPEND) { <-------- false f= lags =3D 0 MDB_val k2; rc =3D mdb_cursor_last(mc, = &k2, &d2); if (rc =3D=3D 0) { rc =3D mc->= mc_dbx->md_cmp(key, &k2); if (rc > 0)= { = rc =3D MDB_NOTFOUND; = mc->mc_ki[mc->mc_top]++; } else { = /* new key is <=3D last key */ = rc =3D MDB_KEYEXIST; } } } else {<-------- executed rc =3D mdb_cursor_set(mc, k= ey, &d2, MDB_SET, &exact); <-------- returns -30798 which is MDB_NOTFOUND }<-------- executed if ((flags & MDB_NOOVERWRITE) && rc =3D=3D = 0) { <-------- false flags =3D 0 DPRINTF(("duplicate key [%s= ]", DKEY(key))); *data =3D d2; return MDB_KEYEXIST; } if (rc && rc !=3D MDB_NOTFOUND) <-------- f= alse rc =3D MDB_NOTFOUND return rc; }<-------- executed if (mc->mc_flags & C_DEL) mc->mc_flags ^=3D C_DEL; /* Cursor is positioned, check for room in the dirty list *= / if (!nospill) { <-------- true if (flags & MDB_MULTIPLE) { rdata =3D &xdata; xdata.mv_size =3D data->mv_= size * dcount; } else { rdata =3D data; <-------- e= xecuted } if ((rc2 =3D mdb_page_spill(mc, key, rdata)= )) <-------- returned 0 or would have returned return rc2; }<-------- executed if (rc =3D=3D MDB_NO_ROOT) { <-------- false MDB_page *np; /* new database, write a root leaf page */ DPUTS("allocating new root leaf page"); if ((rc2 =3D mdb_page_new(mc, P_LEAF, 1, &n= p))) { return rc2; } mdb_cursor_push(mc, np); mc->mc_db->md_root =3D np->mp_pgno; mc->mc_db->md_depth++; *mc->mc_dbflag |=3D DB_DIRTY; if ((mc->mc_db->md_flags & (MDB_DUPSORT|MDB= _DUPFIXED)) =3D=3D MDB_DUPFIXED) np->mp_flags |=3D P_LEAF2; mc->mc_flags |=3D C_INITIALIZED; } else { /* make sure all cursor pages are writable = */ rc2 =3D mdb_cursor_touch(mc); <-------- is = this called and returns 0 because it does not return if (rc2) return rc2; } <-------- executed insert_key =3D insert_data =3D rc; <-------- rc =3D -30798 = or MDB_NOTFOUND! if (insert_key) { <-------- true /* The key does not exist */ DPRINTF(("inserting key at index %i", mc->m= c_ki[mc->mc_top])); if ((mc->mc_db->md_flags & MDB_DUPSORT) && LEAFSIZE(key, data) > env->= me_nodemax) <-------- false since mc->mc_db->md_flags =3D 0 { /* Too big for a node, inse= rt in sub-DB. Set up an empty * "old sub-page" for prep_s= ubDB to expand to a full page. */ fp_flags =3D P_LEAF|P_DIRTY= ; fp =3D env->me_pbuf; fp->mp_pad =3D data->mv_siz= e; /* used if MDB_DUPFIXED */ fp->mp_lower =3D fp->mp_upp= er =3D (PAGEHDRSZ-PAGEBASE); olddata.mv_size =3D PAGEHDR= SZ; goto prep_subDB; } <-------- this was not executed, and the = very long external else contingency below should be skipped! } else { /* there's only a key anyway, so this is a = no-op */ if (IS_LEAF2(mc->mc_pg[mc->mc_top])) { char *ptr; unsigned int ksize =3D mc->= mc_db->md_pad; if (key->mv_size !=3D ksize= ) return MDB_= BAD_VALSIZE; ptr =3D LEAF2KEY(mc->mc_pg[= mc->mc_top], mc->mc_ki[mc->mc_top], ksize); memcpy(ptr, key->mv_data, k= size); fix_parent: /* if overwriting slot 0 of= leaf, need to * update branch key if ther= e is a parent page */ if (mc->mc_top && !mc->mc_k= i[mc->mc_top]) { unsigned sh= ort dtop =3D 1; mc->mc_top-= -; /* slot 0 i= s always an empty key, find real slot */ while (mc->= mc_top && !mc->mc_ki[mc->mc_top]) { = mc->mc_top--; = dtop++; } if (mc->mc_= ki[mc->mc_top]) = rc2 =3D mdb_update_key(mc, key); else = rc2 =3D MDB_SUCCESS; mc->mc_top = +=3D dtop; if (rc2) = return rc2; } return MDB_SUCCESS; } more: leaf =3D NODEPTR(mc->mc_pg[mc->mc_top], mc-= >mc_ki[mc->mc_top]); olddata.mv_size =3D NODEDSZ(leaf); olddata.mv_data =3D NODEDATA(leaf); /* DB has dups? */ if (F_ISSET(mc->mc_db->md_flags, MDB_DUPSOR= T)) { /* Prepare (sub-)page/sub-D= B to accept the new item, * if needed. fp: old sub-p= age or a header faking * it. mp: new (sub-)page. = offset: growth in page * size. xdata: node data w= ith new page or DB. */ unsigned i, off= set =3D 0; mp =3D fp =3D xdata.mv_data= =3D env->me_pbuf; mp->mp_pgno =3D mc->mc_pg[m= c->mc_top]->mp_pgno; /* Was a single item before= , must convert now */ if (!F_ISSET(leaf->mn_flags= , F_DUPDATA)) { MDB_cmp_fun= c *dcmp; /* Just ove= rwrite the current item */ if (flags = =3D=3D MDB_CURRENT) = goto current; dcmp =3D mc= ->mc_dbx->md_dcmp; #if UINT_MAX < SIZE_MAX if (dcmp = =3D=3D mdb_cmp_int && olddata.mv_size =3D=3D sizeof(size_t)) = dcmp =3D mdb_cmp_clong; #endif /* does dat= a match? */ if (!dcmp(d= ata, &olddata)) { = if (flags & (MDB_NODUPDATA|MDB_APPENDDUP)) = return MDB_KEYEXIST; = /* overwrite it */ = goto current; } /* Back up = original data item */ dkey.mv_siz= e =3D olddata.mv_size; dkey.mv_dat= a =3D memcpy(fp+1, olddata.mv_data, olddata.mv_size); /* Make sub= -page header for the dup items, with dummy body */ fp->mp_flag= s =3D P_LEAF|P_DIRTY|P_SUBP; fp->mp_lowe= r =3D (PAGEHDRSZ-PAGEBASE); xdata.mv_si= ze =3D PAGEHDRSZ + dkey.mv_size + data->mv_size; if (mc->mc_= db->md_flags & MDB_DUPFIXED) { = fp->mp_flags |=3D P_LEAF2; = fp->mp_pad =3D data->mv_size; = xdata.mv_size +=3D 2 * data->mv_size; /* leave space for 2 more *= / } else { = xdata.mv_size +=3D 2 * (sizeof(indx_t) + NODESIZE) + = (dkey.mv_size & 1) + (data->mv_size & 1); } fp->mp_uppe= r =3D xdata.mv_size - PAGEBASE; olddata.mv_= size =3D xdata.mv_size; /* pretend olddata is fp */ } else if (leaf->mn_flags &= F_SUBDATA) { /* Data is = on sub-DB, just store it */ flags |=3D = F_DUPDATA|F_SUBDATA; goto put_su= b; } else { /* Data is = on sub-page */ fp =3D oldd= ata.mv_data; switch (fla= gs) { default: = if (!(mc->mc_db->md_flags & MDB_DUPFIXED)) { = offset =3D EVEN(NODESIZE + sizeof(indx_t) + = data->mv_size); = break; = } = offset =3D fp->mp_pad; = if (SIZELEFT(fp) < offset) { = offset *=3D 4; /* space for 4 more */ = break; = } = /* FALLTHRU: Big enough MDB_DUPFIXED sub-page */ case MDB_CU= RRENT: = fp->mp_flags |=3D P_DIRTY; = COPY_PGNO(fp->mp_pgno, mp->mp_pgno); = mc->mc_xcursor->mx_cursor.mc_pg[0] =3D fp; = flags |=3D F_DUPDATA; = goto put_sub; } xdata.mv_si= ze =3D olddata.mv_size + offset; } fp_flags =3D fp->mp_flags; if (NODESIZE + NODEKSZ(leaf= ) + xdata.mv_size > env->me_nodemax) { = /* Too big for a sub-page, convert to sub-DB */ = fp_flags &=3D ~P_SUBP; prep_subDB: = if (mc->mc_db->md_flags & MDB_DUPFIXED) { = fp_flags |=3D P_LEAF2; = dummy.md_pad =3D fp->mp_pad; = dummy.md_flags =3D MDB_DUPFIXED; = if (mc->mc_db->md_flags & MDB_INTEGERDUP) = dummy.md_flags |=3D MDB_INTEGERKEY; = } else { = dummy.md_pad =3D 0; = dummy.md_flags =3D 0; = } = dummy.md_depth =3D 1; = dummy.md_branch_pages =3D 0; = dummy.md_leaf_pages =3D 1; = dummy.md_overflow_pages =3D 0; = dummy.md_entries =3D NUMKEYS(fp); = xdata.mv_size =3D sizeof(MDB_db); = xdata.mv_data =3D &dummy; = if ((rc =3D mdb_page_alloc(mc, 1, &mp))) = return rc; = offset =3D env->me_psize - olddata.mv_size; = flags |=3D F_DUPDATA|F_SUBDATA; = dummy.md_root =3D mp->mp_pgno; = sub_root =3D mp; } if (mp !=3D fp) { mp->mp_flag= s =3D fp_flags | P_DIRTY; mp->mp_pad = =3D fp->mp_pad; mp->mp_lowe= r =3D fp->mp_lower; mp->mp_uppe= r =3D fp->mp_upper + offset; if (fp_flag= s & P_LEAF2) { = memcpy(METADATA(mp), METADATA(fp), NUMKEYS(fp) * fp->mp_pad); } else { = memcpy((char *)mp + mp->mp_upper + PAGEBASE, (char *)fp + fp->mp_upper= + PAGEBASE, = olddata.mv_size - fp->mp_upper - PAGEBASE); = for (i=3D0; i<NUMKEYS(fp); i++) = mp->mp_ptrs[i] =3D fp->mp_ptrs[i] + offset; } } rdata =3D &xdata; flags |=3D F_DUPDATA; do_sub =3D 1; if (!insert_key) mdb_node_de= l(mc, 0); goto new_sub; } current: /* LMDB passes F_SUBDATA in 'flags' to writ= e a DB record */ if ((leaf->mn_flags ^ flags) & F_SUBDATA) return MDB_INCOMPATIBLE; /* overflow page overwrites need special ha= ndling */ if (F_ISSET(leaf->mn_flags, F_BIGDATA)) { <= -------- is this taken? MDB_page *omp; pgno_t pg; int level, ovpages, dpages = =3D OVPAGES(data->mv_size, env->me_psize); memcpy(&pg, olddata.mv_data= , sizeof(pg)); if ((rc2 =3D mdb_page_get(m= c->mc_txn, pg, &omp, &level)) !=3D 0) return rc2; ovpages =3D omp->mp_pages; /* Is the ov page large eno= ugh? */ if (ovpages >=3D dpages) { if (!(omp->mp_flags & P_D= IRTY) && (level ||= (env->me_flags & MDB_WRITEMAP))) { rc =3D mdb_= page_unspill(mc->mc_txn, omp, &omp); <-------- is this taken? if (rc) = return rc; level =3D 0= ; /* dirty in this txn or clean */ } /* Is it dirty? */ if (omp->mp_flags & P_DIR= TY) { /* yes, ove= rwrite it. Note in this case we don't * bother to= try shrinking the page if the new data * is smalle= r than the overflow threshold. */ if (level >= 1) { = /* It is writable only in a parent txn */ = size_t sz =3D (size_t) env->me_psize * ovpages, off; = MDB_page *np =3D mdb_page_malloc(mc->mc_txn, ovpages); = MDB_ID2 id2; = if (!np) = return ENOMEM; = id2.mid =3D pg; = id2.mptr =3D np; = /* Note - this page is already counted in parent's dirty_room */ = rc2 =3D mdb_mid2l_insert(mc->mc_txn->mt_u.dirty_list, &id2); = mdb_cassert(mc, rc2 =3D=3D 0); = if (!(flags & MDB_RESERVE)) { = /* Copy end of page, adjusting alignment so = * compiler may copy words instead of bytes. = */ = off =3D (PAGEHDRSZ + data->mv_size) & -sizeof(size_t); = memcpy((size_t *)((char *)np + off), = (size_t *)((char *)omp + off), sz - of= f); = sz =3D PAGEHDRSZ; = } = memcpy(np, omp, sz); /* Copy beginning of page */ = omp =3D np; } SETDSZ(leaf= , data->mv_size); if (F_ISSET= (flags, MDB_RESERVE)) = data->mv_data =3D METADATA(omp); else = memcpy(METADATA(omp), data->mv_data, data->mv_size); return MDB_= SUCCESS; } } if ((rc2 =3D mdb_ovpage_fre= e(mc, omp)) !=3D MDB_SUCCESS) return rc2; } else if (data->mv_size =3D=3D olddata.mv_= size) { /* same size, just replace = it. Note that we could * also reuse this node if t= he new data is smaller, * but instead we opt to shr= ink the node in that case. */ if (F_ISSET(flags, MDB_RESE= RVE)) data->mv_da= ta =3D olddata.mv_data; else if (!(mc->mc_flags & C= _SUB)) memcpy(oldd= ata.mv_data, data->mv_data, data->mv_size); else { memcpy(NODE= KEY(leaf), key->mv_data, key->mv_size); goto fix_pa= rent; } return MDB_SUCCESS; } mdb_node_del(mc, 0); } <-------- This entire else contingency was likely skipped= !! rdata =3D data; new_sub: nflags =3D flags & NODE_ADD_FLAGS; nsize =3D IS_LEAF2(mc->mc_pg[mc->mc_top]) ? key->mv_size : = mdb_leaf_size(env, key, rdata); <-------- SEGV ... This may be an identifiable bug in mdb_cursor_put() as It does not safely h= andle the case when the noted call to mdb_cursor_set() returns MDB_NOTFOUND= (-30798)! It explicitly fails to preemptively exit by returning an error in this case= . The value of -30798 is in turn assigned to insert_key, which is therefore n= on-null in the condition of the subsequent if statement. insert_key =3D insert_data =3D rc; <-------- insert_key =3D= -30798 or MDB_NOTFOUND! if (insert_key) { <-------- true /* The key does not exist */ DPRINTF(("inserting key at index %i", mc->m= c_ki[mc->mc_top])); if ((mc->mc_db->md_flags & MDB_DUPSORT) && LEAFSIZE(key, data) > env->= me_nodemax) <-------- false since mc->mc_db->md_flags =3D 0 { /* Too big for a node, inse= rt in sub-DB. Set up an empty * "old sub-page" for prep_s= ubDB to expand to a full page. */ fp_flags =3D P_LEAF|P_DIRTY= ; fp =3D env->me_pbuf; fp->mp_pad =3D data->mv_siz= e; /* used if MDB_DUPFIXED */ fp->mp_lower =3D fp->mp_upp= er =3D (PAGEHDRSZ-PAGEBASE); olddata.mv_size =3D PAGEHDR= SZ; goto prep_subDB; } <-------- this was not executed, and the = very long else contingency below is skipped! } else { Since mc->mc_db->md_flags =3D 0, the contingency in the embedded if stateme= nt fails. The segmentation fault occurs due to the call of IS_LEAF2 on the null point= er mc->mc_pg[0]. rdata =3D data; new_sub: nflags =3D flags & NODE_ADD_FLAGS; nsize =3D IS_LEAF2(mc->mc_pg[mc->mc_top]) ? key->mv_size : = mdb_leaf_size(env, key, rdata); <-------- SEGV Regards, Robins. --_000_MN2PR06MB55017A7261FA27380778753BAFEA0MN2PR06MB5501namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable <html xmlns:v=3D"urn:schemas-microsoft-com:vml" xmlns:o=3D"urn:schemas-micr= osoft-com:office:office" xmlns:w=3D"urn:schemas-microsoft-com:office:word" = xmlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml" xmlns=3D"http:= //www.w3.org/TR/REC-html40"> <head> <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"= > <meta name=3D"Generator" content=3D"Microsoft Word 15 (filtered medium)"> <style></style> </head> <body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72"> <div class=3D"WordSection1"> <repost since the previous message came as 64 = encoded, apologies><o:p></o:p> <o:p> </o:p> Hello Howard,<o:p></o:p> we are not able to reproduce the issue consistent= ly so test code is not available at this time, and I do believe this issue = will be present in the latest code as well since Myk also reported the same= ..  Attaching analysis from our side, hope it helps.<o:p></o:p> <o:p> </o:p> The call stack what we have seen is,<o:p></o:p></= p> <o:p> </o:p>     #0 0x0011b62e in mdb_cursor_pu= t (mc=3D0xffe52d18, key=3D0xffe52e74, data=3D0xffe52e6c, flags=3D0) at mdb.= c:6688<o:p></o:p>     #1 0x0011c8ec in mdb_put (txn= =3D0xdc13f008, dbi=3D2, key=3D0xffe52e74, data=3D0xffe52e6c, flags=3D0) at = mdb.c:8771<o:p></o:p>     #2 0x00b792b8 in LMDB::LMDBCon= text::createSession (this=3D0x80ca418, sid=3D0x8297be4 "sidebf3708f0fd= 9fcb8e062529da47adf51402dfc4600000000+") at lmdbint.cc:460<o:p></o= :p>     #3 0x08053564 in updateLMDB (r= equest=3D..., forward=3D@0xffe5315f) at sessionserver.cc:1075<o:p></o:p></p= >     #4 processRequestWithoutRespon= se (request=3D..., forward=3D@0xffe5315f) at sessionserver.cc:1160<o:p></o:= p>     #5 0x08056a80 in processReques= t (this=3D0x80b2ac0, fd=3D33) at sessionserver.cc:1189<o:p></o:p>     #6 readFromSock (this=3D0x80b2= ac0, fd=3D33) at sessionserver.cc:1342<o:p></o:p>     #7 SockHandler::ioReady (this= =3D0x80b2ac0, fd=3D33) at sessionserver.cc:1455<o:p></o:p>     #8 0x00ba2592 in runCoreDispat= cher (default_t=3D<value optimized out>, flags=3D-1) at fds.cc:889<o:= p></o:p>     #9 0x00ba2ff7 in DSEvntFds::ru= nDispatcher () at fds.cc:945<o:p></o:p>     #10 0x080559c6 in main () at s= essionserver.cc:1739<o:p></o:p> <o:p> </o:p> Here it is helpful to examine frames #0 and #1 in= detail in relation to the relevant source code /libraries/liblmdb/mdb.c.<o= :p></o:p> <o:p> </o:p> Frame #1<o:p></o:p> <o:p> </o:p> #1  0x0011c8ec in mdb_put (txn=3D0xdc13f008,= dbi=3D2, key=3D0xffe52e74, data=3D0xffe52e6c, flags=3D0) at mdb.c:8771<o:p= ></o:p>         mc =3D= {mc_next =3D 0x0, mc_backup =3D 0x0, mc_xcursor =3D 0x0, mc_txn =3D 0xdc13= f008, mc_dbi =3D 2, mc_db =3D 0xdc13f088, mc_dbx =3D 0xe1215038, mc_dbflag = =3D 0xdc1cf09a "\033", '\032' <repeats 51 times>, mc_snum = =3D 0, mc_top =3D 0, mc_flags =3D 0, mc_pg =3D {0x0, 0x80b2ac0, 0xffe52d68, 0x28afce, 0xdc13f008, 0x80ce9b0, 0x= ffe52dc8, 0x4c5ff4, 0x2b, 0x80b2ac0, 0xffe52d98, 0x49209a, 0x2b, 0x4c5ff4, = 0x2121cb, 0x21576c, 0x8297d34, 0x3497af, 0x21576c, 0x21316a, 0x8297d34, 0x8= 0ac7b0, 0x1e, 0x46eed6, 0x2b, 0x0, 0x80ce9b0, 0x4c5ff4, 0x80ac7b0, 0x8297d34, 0xffe52df8, 0x46fb96}, mc_ki = =3D {0, 2089, 51120, 2058, 30, 0, 16796, 17, 11760, 65509, 3, 0, 32040, 208= 9, 30, 0, 0, 0, 0, 0, 3, 0, 24564, 76, 51120, 2058, 10944, 2059, 11800, 655= 09, 64758, 70}} <--------<o:p></o:p>         &= nbsp;       <o:p></o:p>         mx =3D= {mx_cursor =3D {mc_next =3D 0x38, mc_backup =3D 0x3, mc_xcursor =3D 0x0, m= c_txn =3D 0x0, mc_dbi =3D 0, mc_db =3D 0x28, mc_dbx =3D 0x0, mc_dbflag =3D = 0x0, mc_snum =3D 3, mc_top =3D 0, mc_flags =3D 17, mc_pg =3D {0x3a93d8, 0x1= 0, 0x0, 0x18, 0x3a93a0, 0x0, 0x3a93d0, 0x289abe, 0x3a93a0, 0xffe52d3f, 0xffe52c68, 0x28afce, 0xffe= 52dbc, 0xffe52db4, 0x3, 0x4c5ff4, 0x11, 0x36c99b, 0x6e, 0x77, 0x7c, 0x5b, 0= x38, 0x289abe, 0x0, 0x0, 0x0, 0x28, 0x0, 0x0, 0x3, 0x10}, mc_ki =3D {37848,= 58, 51611, 54, 110, 0, 119, 0, 124, 0, 91, 0, 58, 0, 39614, 40, 0, 0, 0, 0, 0, 0, 160, 0, 0, 0, 2, 0, 18, 0, 1= 36, 0}}, mx_db =3D {md_pad =3D 3838936, md_flags =3D 51611, md_depth =3D 54= , md_branch_pages =3D 110, md_leaf_pages =3D 119, md_overflow_pages =3D 124= , md_entries =3D 91, md_root =3D 56}, mx_dbx =3D {md_name =3D {mv_size =3D 6, mv_data =3D 0x0}, md_cmp =3D 0, md_dcmp =3D 0, md_rel = =3D 0x40, md_relctx =3D 0x0}, mx_dbflag =3D 0 '\000'}<o:p></o:p>         rc =3D= 0 <o:p></o:p> <o:p> </o:p> And source code for mdb_put() is from mdb.c<o:p><= /o:p> <o:p> </o:p> int<o:p></o:p> mdb_put(MDB_txn *txn, MDB_dbi dbi,<o:p></o:p>     MDB_val *key, MDB_val *data, u= nsigned int flags) {<o:p></o:p>         &= nbsp;       MDB_cursor mc;<o:p></o:p>         &= nbsp;       MDB_xcursor mx;<o:p></o:p>         &= nbsp;       int rc;<o:p></o:p> <o:p> </o:p>         &= nbsp;       if (!key || !data || !TXN_DBI_EXI= ST(txn, dbi, DB_USRVALID))<o:p></o:p>         &= nbsp;           &nbs= p;           return EINVA= L;<o:p></o:p> <o:p> </o:p>         &= nbsp;       if (flags & ~(MDB_NOOVERWRITE= |MDB_NODUPDATA|MDB_RESERVE|MDB_APPEND|MDB_APPENDDUP))<o:p></o:p>         &= nbsp;           &nbs= p;           return EINVA= L;<o:p></o:p> <o:p> </o:p>         &= nbsp;       if (txn->mt_flags & (MDB_T= XN_RDONLY|MDB_TXN_BLOCKED))<o:p></o:p>         &= nbsp;           &nbs= p;           return (txn-= >mt_flags & MDB_TXN_RDONLY) ? EACCES : MDB_BAD_TXN;<o:p></o:p> <o:p> </o:p>         &= nbsp;       mdb_cursor_init(&mc, txn, dbi= , &mx); <-------- see source code below<o:p></o:p>         &= nbsp;       mc.mc_next =3D txn->mt_cursors= [dbi];<o:p></o:p>         &= nbsp;       txn->mt_cursors[dbi] =3D &= mc;<o:p></o:p>         &= nbsp;       rc =3D mdb_cursor_put(&mc, ke= y, data, flags); <-------- see Frame #0<o:p></o:p>         &= nbsp;       txn->mt_cursors[dbi] =3D mc.mc= _next;<o:p></o:p>         &= nbsp;       return rc;<o:p></o:p> }<o:p></o:p> <o:p> </o:p> <o:p> </o:p> Source Code For mdb_cursor_init() From mdb.c<o:p>= </o:p> /** Initialize a cursor for a given transaction a= nd database. */ static void mdb_cursor_init(MDB_cursor *mc, MDB_txn *txn, M= DB_dbi dbi, MDB_xcursor *mx) {<o:p></o:p>         &= nbsp;       mc->mc_next =3D NULL;<o:p></o:= p>         &= nbsp;       mc->mc_backup =3D NULL;<o:p></= o:p>         &= nbsp;       mc->mc_dbi =3D dbi;<o:p></o:p>=         &= nbsp;       mc->mc_txn =3D txn;<o:p></o:p>=         &= nbsp;       mc->mc_db =3D &txn->mt_= dbs[dbi];<o:p></o:p>         &= nbsp;       mc->mc_dbx =3D &txn->mt= _dbxs[dbi];<o:p></o:p>         &= nbsp;       mc->mc_dbflag =3D &txn-&gt= ;mt_dbflags[dbi];<o:p></o:p>         &= nbsp;       mc->mc_snum =3D 0; <-------= - <o:p></o:p>         &= nbsp;       mc->mc_top =3D 0; <--------=   <o:p></o:p>         &= nbsp;       mc->mc_pg[0] =3D 0; <------= -- <o:p></o:p>         &= nbsp;       mc->mc_ki[0] =3D 0;<o:p></o:p>=         &= nbsp;       mc->mc_flags =3D 0;<o:p></o:p>=         &= nbsp;       if (txn->mt_dbs[dbi].md_flags = & MDB_DUPSORT) {<o:p></o:p>         &= nbsp;           &nbs= p;           mdb_tassert(= txn, mx !=3D NULL);<o:p></o:p>         &= nbsp;           &nbs= p;           mc->mc_xc= ursor =3D mx;<o:p></o:p>         &= nbsp;           &nbs= p;           mdb_xcursor_= init0(mc);<o:p></o:p>         &= nbsp;       } else {<o:p></o:p>         &= nbsp;           &nbs= p;           mc->mc_xc= ursor =3D NULL;<o:p></o:p>         &= nbsp;       }<o:p></o:p>         &= nbsp;       if (*mc->mc_dbflag & DB_ST= ALE) { <-------- false *mc->mc_dbflag =3D 27, DB_STALE =3D 0x02 =             &nb= sp;    /**< Named-DB record is older than txnID */<o:p></= o:p>         &= nbsp;           &nbs= p;           mdb_page_sea= rch(mc, NULL, MDB_PS_ROOTONLY); <o:p></o:p>         &= nbsp;       }<o:p></o:p> }<o:p></o:p> <o:p> </o:p> From this we know that when mdb_cursor_put() is c= alled, the following values remain assigned:<o:p></o:p> <o:p> </o:p>         &= nbsp;     mc->mc_snum =3D 0; <--------<o:p></o:p>=         &= nbsp;       mc->mc_top =3D 0; <--------=   <o:p></o:p>         &= nbsp;       mc->mc_pg[0] =3D 0; <------= -- <o:p></o:p> <o:p> </o:p> and its noted these two values still have their i= nitial values at the time of the segmentation fault.<o:p></o:p> <o:p> </o:p> (gdb) fr 0<o:p></o:p> #0 0x0011b62e in mdb_cursor_put (mc=3D0xffe52d18,= key=3D0xffe52e74, data=3D0xffe52e6c, flags=3D0) at mdb.c:6688<o:p></o:p></= p> 6688 in mdb.c<o:p></o:p> (gdb) p mc->mc_top<o:p></o:p> $1 =3D 0<o:p></o:p> (gdb) p mc->mc_pg[mc->mc_top]<o:p></o:p></p= > $19 =3D (MDB_page *) 0x0<o:p></o:p> <o:p> </o:p> Let us consider how the path taken through mdb_cu= rsor_put() could account for these null variable values which result in a s= egmentation fault.<o:p></o:p> <o:p> </o:p> Frame #0<o:p></o:p> <o:p> </o:p> #0  0x0011b62e in mdb_cursor_put (mc=3D0xffe= 52d18, key=3D0xffe52e74, data=3D0xffe52e6c, flags=3D0) at mdb.c:6688 <--= ------ flags =3D 0<o:p></o:p>         env = =3D 0x80ce9b0<o:p></o:p>         leaf = =3D <value optimized out><o:p></o:p>         fp =3D= <value optimized out><o:p></o:p>         mp =3D= 0x38<o:p></o:p>         sub_ro= ot =3D 0x0 <o:p></o:p>         f= p_flags =3D <value optimized out><o:p></o:p>         xdata = =3D {mv_size =3D 3838880, mv_data =3D 0xdc1cf09a}<o:p></o:p>         rdata = =3D 0xffe52e6c<o:p></o:p>         dkey = =3D {mv_size =3D 0, mv_data =3D 0x3a93cc}<o:p></o:p>         olddat= a =3D {mv_size =3D 22, mv_data =3D 0x36c820}<o:p></o:p>         dummy = =3D {md_pad =3D 22, md_flags =3D 11128, md_depth =3D 65509, md_branch_pages= =3D 16, md_leaf_pages =3D 1507329, md_overflow_pages =3D 0, md_entries =3D= 3838928, md_root =3D 3833844}<o:p></o:p>         do_sub= =3D 0<o:p></o:p>         insert= _key =3D -30798 <-------- #define MDB_NOTFOUND    &n= bsp;     (-30798)<o:p></o:p>         insert= _data =3D -30798 <-------- #define MDB_NOTFOUND    &= nbsp;   (-30798)<o:p></o:p>         mcount= =3D 0<o:p></o:p>         dcount= =3D 0<o:p></o:p>         nospil= l =3D 0 <--------<o:p></o:p>         nsize = =3D <value optimized out><o:p></o:p>         rc =3D= 0 <o:p></o:p>         r= c2 =3D <value optimized out><o:p></o:p>         nflags= =3D 0 <--------<o:p></o:p>         __func= __ =3D "mdb_cursor_put"       =    <o:p></o:p> <o:p> </o:p> We know that mc->mc_top and mc->mc_pg[0] we= re initialized to 0 in mdb_cursor_init(). As my annotations of the source c= ode below suggest, careful analysis reveals that the paths actually taken t= hrough mdb_cursor_put() do not modify these assignments.<o:p></o:p> <o:p> </o:p> Excerpted Source Code For mdb_cursor_put() From m= db.c<o:p></o:p> <o:p> </o:p> int<o:p></o:p> mdb_cursor_put(MDB_cursor *mc, MDB_val *key, MDB_= val *data,<o:p></o:p>     unsigned int flags)<o:p></o:p>= {<o:p></o:p>         &= nbsp;       MDB_env    &n= bsp;           &nbsp= ;           *env;<o:p></o= :p>         &= nbsp;       MDB_node    &= nbsp;    *leaf =3D NULL;<o:p></o:p>         &= nbsp;       MDB_page    &= nbsp;    *fp, *mp, *sub_root =3D NULL;<o:p></o:p>         &= nbsp;       uint16_t    &= nbsp;          fp_flags;<o:p><= /o:p>         &= nbsp;       MDB_val    &n= bsp;           &nbsp= ;             x= data, *rdata, dkey, olddata;<o:p></o:p>         &= nbsp;       MDB_db dummy;<o:p></o:p>         &= nbsp;       int do_sub =3D 0, insert_key, ins= ert_data;<o:p></o:p>         &= nbsp;       unsigned int mcount =3D 0, dcount= =3D 0, nospill;<o:p></o:p>         &= nbsp;       size_t nsize;<o:p></o:p>         &= nbsp;       int rc, rc2;<o:p></o:p>         &= nbsp;       unsigned int nflags;<o:p></o:p></= p>         &= nbsp;       DKBUF;<o:p></o:p> <o:p> </o:p>         &= nbsp;       if (mc =3D=3D NULL || key =3D=3D = NULL)<o:p></o:p>         &= nbsp;           &nbs= p;           return EINVA= L;<o:p></o:p> <o:p> </o:p>         &= nbsp;       env =3D mc->mc_txn->mt_env;= <o:p></o:p> <o:p> </o:p>         &= nbsp;       /* Check this first so counter wi= ll always be zero on any<o:p></o:p>         &= nbsp;       * early failures.<o:p></o:p>         &= nbsp;       */<o:p></o:p>         &= nbsp;       if (flags & MDB_MULTIPLE) {<o= :p></o:p>         &= nbsp;           &nbs= p;           dcount =3D d= ata[1].mv_size;<o:p></o:p>         &= nbsp;           &nbs= p;           data[1].mv_s= ize =3D 0;<o:p></o:p>         &= nbsp;           &nbs= p;           if (!F_ISSET= (mc->mc_db->md_flags, MDB_DUPFIXED))<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  return MDB_INCOMPATIBLE;<o:p></o:p>         &= nbsp;       }<o:p></o:p> <o:p> </o:p>         &= nbsp;       nospill =3D flags & MDB_NOSPI= LL;<o:p></o:p>         &= nbsp;       flags &=3D ~MDB_NOSPILL;<o:p>= </o:p> <o:p> </o:p>         &= nbsp;       if (mc->mc_txn->mt_flags &a= mp; (MDB_TXN_RDONLY|MDB_TXN_BLOCKED))<o:p></o:p>         &= nbsp;           &nbs= p;           return (mc-&= gt;mc_txn->mt_flags & MDB_TXN_RDONLY) ? EACCES : MDB_BAD_TXN;<o:p></= o:p> <o:p> </o:p>         &= nbsp;       if (key->mv_size-1 >=3D ENV= _MAXKEY(env))<o:p></o:p>         &= nbsp;           &nbs= p;           return MDB_B= AD_VALSIZE;<o:p></o:p> <o:p> </o:p> #if SIZE_MAX > MAXDATASIZE<o:p></o:p>         &= nbsp;       if (data->mv_size > ((mc-&g= t;mc_db->md_flags & MDB_DUPSORT) ? ENV_MAXKEY(env) : MAXDATASIZE))<o= :p></o:p>         &= nbsp;           &nbs= p;           return MDB_B= AD_VALSIZE;<o:p></o:p> #else<o:p></o:p>         &= nbsp;       if ((mc->mc_db->md_flags &a= mp; MDB_DUPSORT) && data->mv_size > ENV_MAXKEY(env))<o:p></o:= p>         &= nbsp;           &nbs= p;           return MDB_B= AD_VALSIZE;<o:p></o:p> #endif<o:p></o:p> <o:p> </o:p>         &= nbsp;       DPRINTF(("=3D=3D> put db = %d key [%s], size %"Z"u, data size %"Z"u",<o:p></o= :p>         &= nbsp;           &nbs= p;           DDBI(mc), DK= EY(key), key ? key->mv_size : 0, data->mv_size));<o:p></o:p> <o:p> </o:p>         &= nbsp;       dkey.mv_size =3D 0;<o:p></o:p></p= > <o:p> </o:p>         &= nbsp;       if (flags =3D=3D MDB_CURRENT) { &= lt;-------- false flags =3D 0<o:p></o:p>         &= nbsp;           &nbs= p;           if (!(mc-&gt= ;mc_flags & C_INITIALIZED))<o:p></o:p>         &= nbsp;           &nbs= p;             =             &nb= sp; return EINVAL;<o:p></o:p>         &= nbsp;           &nbs= p;           rc =3D MDB_S= UCCESS;<o:p></o:p>         &= nbsp;       } else if (mc->mc_db->md_ro= ot =3D=3D P_INVALID) { <-------- false, mc->mc_db->md_root =3D 68<= o:p></o:p>         &= nbsp;           &nbs= p;           /* new datab= ase, cursor has nothing to point to */<o:p></o:p>         &= nbsp;           &nbs= p;           mc->mc_sn= um =3D 0;<o:p></o:p>         &= nbsp;           &nbs= p;           mc->mc_to= p =3D 0;<o:p></o:p>         &= nbsp;           &nbs= p;           mc->mc_fl= ags &=3D ~C_INITIALIZED;<o:p></o:p>         &= nbsp;           &nbs= p;           rc =3D MDB_N= O_ROOT;  <o:p></o:p>         &= nbsp;       } else { <-------- executed<o:= p></o:p>         &= nbsp;           &nbs= p;           int exact = =3D 0;<o:p></o:p>         &= nbsp;           &nbs= p;           MDB_val d2;<= o:p></o:p>         &= nbsp;           &nbs= p;           if (flags &a= mp; MDB_APPEND) { <-------- false flags =3D 0<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  MDB_val k2;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  rc =3D mdb_cursor_last(mc, &k2, &d2);<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  if (rc =3D=3D 0) {<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     rc =3D mc->mc_dbx->md_cmp(key, &k2)= ;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     if (rc > 0) {<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         rc =3D MDB_NOTFOUND;<o:p= ></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         mc->mc_ki[mc->mc_t= op]++;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     } else {<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         /* new key is <=3D la= st key */<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         rc =3D MDB_KEYEXIST;<o:p= ></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     }<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  }<o:p></o:p>         &= nbsp;           &nbs= p;           } else {<= -------- executed<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  rc =3D mdb_cursor_set(mc, key, &d2, MDB_SET, &exact); <= -------- returns -30798 which is MDB_NOTFOUND<o:p></o:p>         &= nbsp;           &nbs= p;           }<-------= - executed<o:p></o:p>         &= nbsp;           &nbs= p;           if ((flags &= amp; MDB_NOOVERWRITE) && rc =3D=3D 0) { <-------- false flags = =3D 0<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  DPRINTF(("duplicate key [%s]", DKEY(key)));<o:p></o:p></= p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  *data =3D d2;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  return MDB_KEYEXIST;<o:p></o:p>         &= nbsp;           &nbs= p;           }<o:p></o:p>=         &= nbsp;           &nbs= p;           if (rc &= & rc !=3D MDB_NOTFOUND) <-------- false rc =3D MDB_NOTFOUND<o:p></o:= p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  return rc;<o:p></o:p>         &= nbsp;       }<-------- executed<o:p></o:p>= <o:p> </o:p>         &= nbsp;       if (mc->mc_flags & C_DEL)<= o:p></o:p>         &= nbsp;           &nbs= p;           mc->mc_fl= ags ^=3D C_DEL;<o:p></o:p> <o:p> </o:p>         &= nbsp;       /* Cursor is positioned, check fo= r room in the dirty list */<o:p></o:p>         &= nbsp;       if (!nospill) { <-------- true= <o:p></o:p>         &= nbsp;           &nbs= p;           if (flags &a= mp; MDB_MULTIPLE) {<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  rdata =3D &xdata;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  xdata.mv_size =3D data->mv_size * dcount;<o:p></o:p>         &= nbsp;           &nbs= p;           } else {<o:p= ></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  rdata =3D data; <-------- executed<o:p></o:p>         &= nbsp;           &nbs= p;           }<o:p></o:p>=         &= nbsp;           &nbs= p;           if ((rc2 =3D= mdb_page_spill(mc, key, rdata))) <-------- returned 0 or would have ret= urned<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  return rc2;<o:p></o:p>         &= nbsp;       }<-------- executed<o:p></o:p>= <o:p> </o:p>         &= nbsp;       if (rc =3D=3D MDB_NO_ROOT) { <= -------- false <o:p> </o:p>         &= nbsp;           &nbs= p;           MDB_page *np= ;<o:p></o:p>         &= nbsp;           &nbs= p;           /* new datab= ase, write a root leaf page */<o:p></o:p>         &= nbsp;           &nbs= p;           DPUTS("= allocating new root leaf page");<o:p></o:p>         &= nbsp;           &nbs= p;           if ((rc2 =3D= mdb_page_new(mc, P_LEAF, 1, &np))) {<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  return rc2;<o:p></o:p>         &= nbsp;           &nbs= p;           }<o:p></o:p>=         &= nbsp;           &nbs= p;           mdb_cursor_p= ush(mc, np);<o:p></o:p>         &= nbsp;           &nbs= p;           mc->mc_db= ->md_root =3D np->mp_pgno;<o:p></o:p>         &= nbsp;           &nbs= p;           mc->mc_db= ->md_depth++;<o:p></o:p>         &= nbsp;           &nbs= p;           *mc->mc_d= bflag |=3D DB_DIRTY;<o:p></o:p>         &= nbsp;           &nbs= p;           if ((mc->= mc_db->md_flags & (MDB_DUPSORT|MDB_DUPFIXED))<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  =3D=3D MDB_DUPFIXED)<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  np->mp_flags |=3D P_LEAF2;<o:p></o:p>         &= nbsp;           &nbs= p;           mc->mc_fl= ags |=3D C_INITIALIZED;<o:p></o:p>         &= nbsp;       } else {<o:p></o:p>         &= nbsp;           &nbs= p;           /* make sure= all cursor pages are writable */<o:p></o:p>         &= nbsp;           &nbs= p;           rc2 =3D mdb_= cursor_touch(mc); <-------- is this called and returns 0 because it does= not return<o:p></o:p>         &= nbsp;           &nbs= p;           if (rc2)<o:p= ></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  return rc2;<o:p></o:p>         &= nbsp;       } <-------- executed<o:p></o:p= > <o:p> </o:p>         &= nbsp;       insert_key =3D insert_data =3D rc= ; <-------- rc =3D -30798 or MDB_NOTFOUND!<o:p></o:p>         &= nbsp;       if (insert_key) { <-------- tr= ue<o:p></o:p>         &= nbsp;           &nbs= p;           /* The key d= oes not exist */<o:p></o:p>         &= nbsp;           &nbs= p;           DPRINTF((&qu= ot;inserting key at index %i", mc->mc_ki[mc->mc_top]));<o:p></o:= p>         &= nbsp;           &nbs= p;           if ((mc->= mc_db->md_flags & MDB_DUPSORT) &&<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  LEAFSIZE(key, data) > env->me_nodemax) <-------- false si= nce mc->mc_db->md_flags =3D 0<o:p></o:p>         &= nbsp;           &nbs= p;           {<o:p></o:p>=         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  /* Too big for a node, insert in sub-DB.  Set up an empty<o:p= ></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  * "old sub-page" for prep_subDB to expand to a full page= .<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  */<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  fp_flags =3D P_LEAF|P_DIRTY;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  fp =3D env->me_pbuf;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  fp->mp_pad =3D data->mv_size; /* used if MDB_DUPFIXED */<o:p= ></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  fp->mp_lower =3D fp->mp_upper =3D (PAGEHDRSZ-PAGEBASE);<o:p>= </o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  olddata.mv_size =3D PAGEHDRSZ;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  goto prep_subDB;<o:p></o:p>         &= nbsp;           &nbs= p;           } <------= -- this was not executed, and the very long external else contingency below= should be skipped!<o:p></o:p>         &= nbsp;       } else {<o:p></o:p>         &= nbsp;           &nbs= p;           /* there's o= nly a key anyway, so this is a no-op */<o:p></o:p>         &= nbsp;           &nbs= p;           if (IS_LEAF2= (mc->mc_pg[mc->mc_top])) {<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  char *ptr;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  unsigned int ksize =3D mc->mc_db->md_pad;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  if (key->mv_size !=3D ksize)<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     return MDB_BAD_VALSIZE;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  ptr =3D LEAF2KEY(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->= mc_top], ksize);<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  memcpy(ptr, key->mv_data, ksize);<o:p></o:p> fix_parent:<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  /* if overwriting slot 0 of leaf, need to<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  * update branch key if there is a parent page<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  */<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  if (mc->mc_top && !mc->mc_ki[mc->mc_top]) {<o:p><= /o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     unsigned short dtop =3D 1;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     mc->mc_top--;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     /* slot 0 is always an empty key, find real s= lot */<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     while (mc->mc_top && !mc->mc_ki= [mc->mc_top]) {<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         mc->mc_top--;<o:p></o= :p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         dtop++;<o:p></o:= p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     }<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     if (mc->mc_ki[mc->mc_top])<o:p></o:p></= p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         rc2 =3D mdb_update_key(m= c, key);<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     else<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         rc2 =3D MDB_SUCCESS;<o:p= ></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     mc->mc_top +=3D dtop;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     if (rc2)<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         return rc2;<o:p></o:p></= p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  }<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  return MDB_SUCCESS;<o:p></o:p>         &= nbsp;           &nbs= p;           }<o:p></o:p>= <o:p> </o:p> more:<o:p></o:p>         &= nbsp;           &nbs= p;           leaf =3D NOD= EPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]);<o:p></o:p><= /p>         &= nbsp;           &nbs= p;           olddata.mv_s= ize =3D NODEDSZ(leaf);<o:p></o:p>         &= nbsp;           &nbs= p;           olddata.mv_d= ata =3D NODEDATA(leaf);<o:p></o:p> <o:p> </o:p>         &= nbsp;           &nbs= p;           /* DB has du= ps? */<o:p></o:p>         &= nbsp;           &nbs= p;           if (F_ISSET(= mc->mc_db->md_flags, MDB_DUPSORT)) { <o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  /* Prepare (sub-)page/sub-DB to accept the new item,<o:p></o:p></p= >         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  * if needed.  fp: old sub-page or a header faking<o:p></o:p><= /p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  * it.  mp: new (sub-)page.  offset: growth in page<o:p><= /o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  * size.  xdata: node data with new page or DB.<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  */<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  unsigned         &nbs= p;   i, offset =3D 0;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  mp =3D fp =3D xdata.mv_data =3D env->me_pbuf;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  mp->mp_pgno =3D mc->mc_pg[mc->mc_top]->mp_pgno;<o:p></= o:p> <o:p> </o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  /* Was a single item before, must convert now */<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  if (!F_ISSET(leaf->mn_flags, F_DUPDATA)) {<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     MDB_cmp_func *dcmp;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     /* Just overwrite the current item */<o:p></o= :p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     if (flags =3D=3D MDB_CURRENT)<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         goto current;<o:p></o:p>=         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     dcmp =3D mc->mc_dbx->md_dcmp;<o:p></o:p= > #if UINT_MAX < SIZE_MAX<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     if (dcmp =3D=3D mdb_cmp_int && olddat= a.mv_size =3D=3D sizeof(size_t))<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         dcmp =3D mdb_cmp_clong;<= o:p></o:p> #endif<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     /* does data match? */<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     if (!dcmp(data, &olddata)) {<o:p></o:p></= p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         if (flags & (MDB_NOD= UPDATA|MDB_APPENDDUP))<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;            ret= urn MDB_KEYEXIST;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         /* overwrite it */<o:p><= /o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         goto current;<o:p></o:p>=         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     }<o:p></o:p> <o:p> </o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     /* Back up original data item */<o:p></o:p></= p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     dkey.mv_size =3D olddata.mv_size;<o:p></o:p><= /p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     dkey.mv_data =3D memcpy(fp+1, olddata.mv_= data, olddata.mv_size);<o:p></o:p> <o:p> </o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     /* Make sub-page header for the dup items, wi= th dummy body */<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     fp->mp_flags =3D P_LEAF|P_DIRTY|P_SUBP;<o:= p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     fp->mp_lower =3D (PAGEHDRSZ-PAGEBASE);<o:p= ></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     xdata.mv_size =3D PAGEHDRSZ + dkey.mv_siz= e + data->mv_size;<o:p></o:p>         &= nbsp;           &nbs= p;             =             &nb= sp;            =      if (mc->mc_db->md_flags & MDB_DUPFIXED) = {<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         fp->mp_flags |=3D P_L= EAF2;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         fp->mp_pad =3D data-&= gt;mv_size;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         xdata.mv_size +=3D 2= * data->mv_size;      /* leave space for 2 mor= e */<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     } else {<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         xdata.mv_size +=3D 2= * (sizeof(indx_t) + NODESIZE) +<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;            (dk= ey.mv_size & 1) + (data->mv_size & 1);<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     }<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     fp->mp_upper =3D xdata.mv_size - PAGEBASE;= <o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     olddata.mv_size =3D xdata.mv_size; /* pretend= olddata is fp */<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  } else if (leaf->mn_flags & F_SUBDATA) {<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     /* Data is on sub-DB, just store it */<o:p></= o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     flags |=3D F_DUPDATA|F_SUBDATA;<o:p></o:p></p= >         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     goto put_sub;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  } else {<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     /* Data is on sub-page */<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     fp =3D olddata.mv_data;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     switch (flags) {<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     default:<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         if (!(mc->mc_db->m= d_flags & MDB_DUPFIXED)) {<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;            off= set =3D EVEN(NODESIZE + sizeof(indx_t) +<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;   data->mv_size);<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;            bre= ak;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         }<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         offset =3D fp->mp_pad= ;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         if (SIZELEFT(fp) < of= fset) {<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;            off= set *=3D 4; /* space for 4 more */<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;            bre= ak;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         }<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         /* FALLTHRU: Big enough = MDB_DUPFIXED sub-page */<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     case MDB_CURRENT:<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         fp->mp_flags |=3D P_D= IRTY;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         COPY_PGNO(fp->mp_pgno= , mp->mp_pgno);<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         mc->mc_xcursor->mx= _cursor.mc_pg[0] =3D fp;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         flags |=3D F_DUPDATA;<o:= p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         goto put_sub;<o:p></o:p>=         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     }<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     xdata.mv_size =3D olddata.mv_size + offse= t;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  }<o:p></o:p> <o:p> </o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  fp_flags =3D fp->mp_flags;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  if (NODESIZE + NODEKSZ(leaf) + xdata.mv_size > env->= me_nodemax) {<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         /* Too big for a sub-pag= e, convert to sub-DB */<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         fp_flags &=3D ~P_SUB= P;<o:p></o:p> prep_subDB:<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         if (mc->mc_db->md_= flags & MDB_DUPFIXED) {<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;            fp_= flags |=3D P_LEAF2;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;            dum= my.md_pad =3D fp->mp_pad;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;            dum= my.md_flags =3D MDB_DUPFIXED;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;            if = (mc->mc_db->md_flags & MDB_INTEGERDUP)<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;   dummy.md_flags |=3D MDB_INTEGERKEY;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         } else {<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;            dum= my.md_pad =3D 0;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;            dum= my.md_flags =3D 0;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         }<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         dummy.md_depth =3D 1;<o:= p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         dummy.md_branch_pages = =3D 0;<o:p></o:p>         &= nbsp;           &nbs= p;             =             &nb= sp;            =             &nb= sp;        dummy.md_leaf_pages =3D 1;<o:= p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         dummy.md_overflow_pages = =3D 0;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         dummy.md_entries =3D NUM= KEYS(fp);<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         xdata.mv_size =3D sizeof= (MDB_db);<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         xdata.mv_data =3D &d= ummy;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         if ((rc =3D mdb_page_all= oc(mc, 1, &mp)))<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;            ret= urn rc;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         offset =3D env->me_ps= ize - olddata.mv_size;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         flags |=3D F_DUPDATA|F_S= UBDATA;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         dummy.md_root =3D mp-&gt= ;mp_pgno;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         sub_root =3D mp;<o:p></o= :p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  }<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  if (mp !=3D fp) {<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     mp->mp_flags =3D fp_flags | P_DIRTY;<o:p><= /o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     mp->mp_pad   =3D fp->mp_pad;<= o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     mp->mp_lower =3D fp->mp_lower;<o:p></o:= p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     mp->mp_upper =3D fp->mp_upper + off= set;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     if (fp_flags & P_LEAF2) {<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         memcpy(METADATA(mp), MET= ADATA(fp), NUMKEYS(fp) * fp->mp_pad);<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     } else {<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         memcpy((char *)mp + = mp->mp_upper + PAGEBASE, (char *)fp + fp->mp_upper + PAGE= BASE,<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;            old= data.mv_size - fp->mp_upper - PAGEBASE);<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         for (i=3D0; i<NUMKEYS= (fp); i++)<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;            mp-= >mp_ptrs[i] =3D fp->mp_ptrs[i] + offset;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     }<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  }<o:p></o:p> <o:p> </o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  rdata =3D &xdata;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  flags |=3D F_DUPDATA;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  do_sub =3D 1;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  if (!insert_key)<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     mdb_node_del(mc, 0);<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  goto new_sub;<o:p></o:p>         &= nbsp;           &nbs= p;           }<o:p></o:p>= current:<o:p></o:p>         &= nbsp;           &nbs= p;           /* LMDB pass= es F_SUBDATA in 'flags' to write a DB record */<o:p></o:p>         &= nbsp;           &nbs= p;           if ((leaf-&g= t;mn_flags ^ flags) & F_SUBDATA)<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  return MDB_INCOMPATIBLE;<o:p></o:p>         &= nbsp;           &nbs= p;           /* overflow = page overwrites need special handling */<o:p></o:p>         &= nbsp;           &nbs= p;           if (F_ISSET(= leaf->mn_flags, F_BIGDATA)) { <-------- is this taken?<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  MDB_page *omp;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  pgno_t pg;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  int level, ovpages, dpages =3D OVPAGES(data->mv_size, env->m= e_psize);<o:p></o:p> <o:p> </o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  memcpy(&pg, olddata.mv_data, sizeof(pg));<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  if ((rc2 =3D mdb_page_get(mc->mc_txn, pg, &omp, &level)= ) !=3D 0)<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     return rc2;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  ovpages =3D omp->mp_pages;<o:p></o:p> <o:p> </o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  /* Is the ov page large enough? */<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  if (ovpages >=3D dpages) {<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;    if (!(omp->mp_flags & P_DIRTY) &&<o:p></o:p>=         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;       (level || (env->me_flags & MDB_= WRITEMAP)))<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;    {<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     rc =3D mdb_page_unspill(mc->mc_txn, omp, &= amp;omp); <-------- is this taken?<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     if (rc)<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         return rc;<o:p></o:p></p= >         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     level =3D 0;     &nb= sp;            =             /* dirty= in this txn or clean */<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;    }<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;    /* Is it dirty? */<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;    if (omp->mp_flags & P_DIRTY) {<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     /* yes, overwrite it. Note in this case we do= n't<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     * bother to try shrinking the page if the new= data<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     * is smaller than the overflow threshold.<o:p= ></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     */<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     if (level > 1) {<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         /* It is writable only i= n a parent txn */<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         size_t sz =3D (size_t) e= nv->me_psize * ovpages, off;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         MDB_page *np =3D mdb_pag= e_malloc(mc->mc_txn, ovpages);<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         MDB_ID2 id2;<o:p></o:p><= /p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         if (!np)<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;            ret= urn ENOMEM;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         id2.mid =3D pg;<o:p></o:= p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         id2.mptr =3D np;<o:p></o= :p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         /* Note - this page is a= lready counted in parent's dirty_room */<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         rc2 =3D mdb_mid2l_insert= (mc->mc_txn->mt_u.dirty_list, &id2);<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         mdb_cassert(mc, rc2 =3D= =3D 0);<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         if (!(flags & MDB_RE= SERVE)) {<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;            /* = Copy end of page, adjusting alignment so<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;            * c= ompiler may copy words instead of bytes.<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;            */<= o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;            off= =3D (PAGEHDRSZ + data->mv_size) & -sizeof(size_t);<o:p></o:p></= p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;            mem= cpy((size_t *)((char *)np + off),<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;   (size_t *)((char *)omp + off), sz - off);<o:p></o:p><= /p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;            sz = =3D PAGEHDRSZ;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         }<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         memcpy(np, omp, sz); /* = Copy beginning of page */<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         omp =3D np;<o:p></o:p></= p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     }<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     SETDSZ(leaf, data->mv_size);<o:p></o:p></p= >         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     if (F_ISSET(flags, MDB_RESERVE))<o:p></o:p></= p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         data->mv_data =3D MET= ADATA(omp);<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     else<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;         memcpy(METADATA(omp), da= ta->mv_data, data->mv_size);<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     return MDB_SUCCESS;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;    }<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  }<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  if ((rc2 =3D mdb_ovpage_free(mc, omp)) !=3D MDB_SUCCESS)<o:p></o:p= >         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     return rc2;<o:p></o:p>         &= nbsp;           &nbs= p;           } else if (d= ata->mv_size =3D=3D olddata.mv_size) {<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  /* same size, just replace it. Note that we could<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  * also reuse this node if the new data is smaller,<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  * but instead we opt to shrink the node in that case.<o:p></o:p></= p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  */<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  if (F_ISSET(flags, MDB_RESERVE))<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     data->mv_data =3D olddata.mv_data;<o:p></o= :p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  else if (!(mc->mc_flags & C_SUB))<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     memcpy(olddata.mv_data, data->mv_data, dat= a->mv_size);<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  else {<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     memcpy(NODEKEY(leaf), key->mv_data, key-&g= t;mv_size);<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;     goto fix_parent;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  }<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  return MDB_SUCCESS;<o:p></o:p>         &= nbsp;           &nbs= p;           }<o:p></o:p>=         &= nbsp;           &nbs= p;           mdb_node_del= (mc, 0);<o:p></o:p>         &= nbsp;       } <-------- This entire else c= ontingency was likely skipped!!<o:p></o:p> <o:p> </o:p>         &= nbsp;       rdata =3D data;<o:p></o:p> <o:p> </o:p> new_sub:<o:p></o:p>         &= nbsp;       nflags =3D flags & NODE_ADD_F= LAGS;<o:p></o:p>         &= nbsp;       nsize =3D IS_LEAF2(mc->mc_pg[m= c->mc_top]) ? key->mv_size : mdb_leaf_size(env, key, rdata); <----= ---- SEGV<o:p></o:p> ...       &nbs= p;    <o:p></o:p> <o:p> </o:p> This may be an identifiable bug in mdb_cursor_put= () as It does not safely handle the case when the noted call to mdb_cursor_= set() returns MDB_NOTFOUND (-30798)!<o:p></o:p> <o:p> </o:p> It explicitly fails to preemptively exit by retur= ning an error in this case.<o:p></o:p> <o:p> </o:p> The value of -30798 is in turn assigned to insert= _key, which is therefore non-null in the condition of the subsequent if sta= tement.<o:p></o:p> <o:p> </o:p>         &= nbsp;       insert_key =3D insert_data =3D rc= ; <-------- insert_key =3D -30798 or MDB_NOTFOUND!<o:p></o:p>         &= nbsp;       if (insert_key) { <-------- tr= ue<o:p></o:p>         &= nbsp;           &nbs= p;           /* The key d= oes not exist */<o:p></o:p>         &= nbsp;           &nbs= p;           DPRINTF((&qu= ot;inserting key at index %i", mc->mc_ki[mc->mc_top]));<o:p></o:= p>         &= nbsp;           &nbs= p;           if ((mc->= mc_db->md_flags & MDB_DUPSORT) &&<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  LEAFSIZE(key, data) > env->me_nodemax) <-------- false si= nce mc->mc_db->md_flags =3D 0<o:p></o:p>         &= nbsp;           &nbs= p;           {<o:p></o:p>=         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  /* Too big for a node, insert in sub-DB.  Set up an empty<o:p= ></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  * "old sub-page" for prep_subDB to expand to a full page= .<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  */<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  fp_flags =3D P_LEAF|P_DIRTY;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  fp =3D env->me_pbuf;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  fp->mp_pad =3D data->mv_size; /* used if MDB_DUPFIXED */<o:p= ></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  fp->mp_lower =3D fp->mp_upper =3D (PAGEHDRSZ-PAGEBASE);<o:p>= </o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  olddata.mv_size =3D PAGEHDRSZ;<o:p></o:p>         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;  goto prep_subDB;<o:p></o:p>         &= nbsp;           &nbs= p;           } <------= -- this was not executed, and the very long else contingency below is skipp= ed!<o:p></o:p>         &= nbsp;       } else {<o:p></o:p> Since mc->mc_db->md_flags =3D 0, the contin= gency in the embedded if statement fails.<o:p></o:p> <o:p> </o:p> The segmentation fault occurs due to the call of = IS_LEAF2 on the null pointer mc->mc_pg[0].<o:p></o:p> <o:p> </o:p>         &= nbsp;       rdata =3D data;<o:p></o:p> <o:p> </o:p> new_sub:<o:p></o:p>         &= nbsp;       nflags =3D flags & NODE_ADD_F= LAGS;<o:p></o:p>         &= nbsp;       nsize =3D IS_LEAF2(mc->mc_pg[m= c->mc_top]) ? key->mv_size : mdb_leaf_size(env, key, rdata); <----= ---- SEGV<o:p></o:p> <o:p> </o:p> Regards,<o:p></o:p> Robins.<o:p></o:p> </div> </body> </html> --_000_MN2PR06MB55017A7261FA27380778753BAFEA0MN2PR06MB5501namp_--

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Re: (ITS#9037) observing crash in mdb_cursor_put()
by hyc＠symas.com 18 Jun '19

18 Jun '19

Robins George wrote: > Hello Howard, > we are not able to reproduce the issue consistently so test code is not available at this time, and I do believe this issue will be present in the latest code as well since Myk also reported the same.. Attaching analysis from our side, hope it helps. Thanks. Notes below... > > The call stack what we have seen is, > > #0 0x0011b62e in mdb_cursor_put (mc=0xffe52d18, key=0xffe52e74, data=0xffe52e6c, flags=0) at mdb.c:6688 > #1 0x0011c8ec in mdb_put (txn=0xdc13f008, dbi=2, key=0xffe52e74, data=0xffe52e6c, flags=0) at mdb.c:8771 > #2 0x00b792b8 in LMDB::LMDBContext::createSession (this=0x80ca418, sid=0x8297be4 "sidebf3708f0fd9fcb8e062529da47adf51402dfc4600000000+") at lmdbint.cc:460 > #3 0x08053564 in updateLMDB (request=..., forward=@0xffe5315f) at sessionserver.cc:1075 > #4 processRequestWithoutResponse (request=..., forward=@0xffe5315f) at sessionserver.cc:1160 > #5 0x08056a80 in processRequest (this=0x80b2ac0, fd=33) at sessionserver.cc:1189 > #6 readFromSock (this=0x80b2ac0, fd=33) at sessionserver.cc:1342 > #7 SockHandler::ioReady (this=0x80b2ac0, fd=33) at sessionserver.cc:1455 > #8 0x00ba2592 in runCoreDispatcher (default_t=<value optimized out>, flags=-1) at fds.cc:889 > #9 0x00ba2ff7 in DSEvntFds::runDispatcher () at fds.cc:945 > #10 0x080559c6 in main () at sessionserver.cc:1739 > > Here it is helpful to examine frames #0 and #1 in detail in relation to the relevant source code /libraries/liblmdb/mdb.c. > > Frame #1 > > #1 0x0011c8ec in mdb_put (txn=0xdc13f008, dbi=2, key=0xffe52e74, data=0xffe52e6c, flags=0) at mdb.c:8771 > mc = {mc_next = 0x0, mc_backup = 0x0, mc_xcursor = 0x0, mc_txn = 0xdc13f008, mc_dbi = 2, mc_db = 0xdc13f088, mc_dbx = 0xe1215038, mc_dbflag = 0xdc1cf09a "\033", '\032' <repeats 51 times>, mc_snum = 0, mc_top = 0, mc_flags = 0, mc_pg = {0x0, 0x80b2ac0, 0xffe52d68, 0x28afce, 0xdc13f008, 0x80ce9b0, 0xffe52dc8, 0x4c5ff4, 0x2b, 0x80b2ac0, 0xffe52d98, 0x49209a, 0x2b, 0x4c5ff4, 0x2121cb, 0x21576c, 0x8297d34, 0x3497af, 0x21576c, 0x21316a, 0x8297d34, 0x80ac7b0, 0x1e, 0x46eed6, 0x2b, 0x0, 0x80ce9b0, 0x4c5ff4, 0x80ac7b0, 0x8297d34, 0xffe52df8, 0x46fb96}, mc_ki = {0, 2089, 51120, 2058, 30, 0, 16796, 17, 11760, 65509, 3, 0, 32040, 2089, 30, 0, 0, 0, 0, 0, 3, 0, 24564, 76, 51120, 2058, 10944, 2059, 11800, 65509, 64758, 70}} <-------- > > mx = {mx_cursor = {mc_next = 0x38, mc_backup = 0x3, mc_xcursor = 0x0, mc_txn = 0x0, mc_dbi = 0, mc_db = 0x28, mc_dbx = 0x0, mc_dbflag = 0x0, mc_snum = 3, mc_top = 0, mc_flags = 17, mc_pg = {0x3a93d8, 0x10, 0x0, 0x18, 0x3a93a0, 0x0, 0x3a93d0, 0x289abe, 0x3a93a0, 0xffe52d3f, 0xffe52c68, 0x28afce, 0xffe52dbc, 0xffe52db4, 0x3, 0x4c5ff4, 0x11, 0x36c99b, 0x6e, 0x77, 0x7c, 0x5b, 0x38, 0x289abe, 0x0, 0x0, 0x0, 0x28, 0x0, 0x0, 0x3, 0x10}, mc_ki = {37848, 58, 51611, 54, 110, 0, 119, 0, 124, 0, 91, 0, 58, 0, 39614, 40, 0, 0, 0, 0, 0, 0, 160, 0, 0, 0, 2, 0, 18, 0, 136, 0}}, mx_db = {md_pad = 3838936, md_flags = 51611, md_depth = 54, md_branch_pages = 110, md_leaf_pages = 119, md_overflow_pages = 124, md_entries = 91, md_root = 56}, mx_dbx = {md_name = {mv_size = 6, mv_data = 0x0}, md_cmp = 0, md_dcmp = 0, md_rel = 0x40, md_relctx = 0x0}, mx_dbflag = 0 '\000'} > rc = 0 > > And source code for mdb_put() is from mdb.c > > int > mdb_put(MDB_txn *txn, MDB_dbi dbi, > MDB_val *key, MDB_val *data, unsigned int flags) > { > MDB_cursor mc; > MDB_xcursor mx; > int rc; > > if (!key || !data || !TXN_DBI_EXIST(txn, dbi, DB_USRVALID)) > return EINVAL; > > if (flags & ~(MDB_NOOVERWRITE|MDB_NODUPDATA|MDB_RESERVE|MDB_APPEND|MDB_APPENDDUP)) > return EINVAL; > > if (txn->mt_flags & (MDB_TXN_RDONLY|MDB_TXN_BLOCKED)) > return (txn->mt_flags & MDB_TXN_RDONLY) ? EACCES : MDB_BAD_TXN; > > mdb_cursor_init(&mc, txn, dbi, &mx); <-------- see source code below > mc.mc_next = txn->mt_cursors[dbi]; > txn->mt_cursors[dbi] = &mc; > rc = mdb_cursor_put(&mc, key, data, flags); <-------- see Frame #0 > txn->mt_cursors[dbi] = mc.mc_next; > return rc; > } > > > Source Code For mdb_cursor_init() From mdb.c > /** Initialize a cursor for a given transaction and database. */ > static void > mdb_cursor_init(MDB_cursor *mc, MDB_txn *txn, MDB_dbi dbi, MDB_xcursor *mx) > { > mc->mc_next = NULL; > mc->mc_backup = NULL; > mc->mc_dbi = dbi; > mc->mc_txn = txn; > mc->mc_db = &txn->mt_dbs[dbi]; > mc->mc_dbx = &txn->mt_dbxs[dbi]; > mc->mc_dbflag = &txn->mt_dbflags[dbi]; > mc->mc_snum = 0; <-------- > mc->mc_top = 0; <-------- > mc->mc_pg[0] = 0; <-------- > mc->mc_ki[0] = 0; > mc->mc_flags = 0; > if (txn->mt_dbs[dbi].md_flags & MDB_DUPSORT) { > mdb_tassert(txn, mx != NULL); > mc->mc_xcursor = mx; > mdb_xcursor_init0(mc); > } else { > mc->mc_xcursor = NULL; > } > if (*mc->mc_dbflag & DB_STALE) { <-------- false *mc->mc_dbflag = 27, DB_STALE = 0x02 /**< Named-DB record is older than txnID */ 27 = 0x1b, so DB_STALE is true. mdb_page_search ought to have been invoked to set the root of the cursor. > mdb_page_search(mc, NULL, MDB_PS_ROOTONLY); > } > } > > From this we know that when mdb_cursor_put() is called, the following values remain assigned: > > mc->mc_snum = 0; <-------- > mc->mc_top = 0; <-------- > mc->mc_pg[0] = 0; <-------- > > and its noted these two values still have their initial values at the time of the segmentation fault. There is no issue with mdb_cursor_put then. The question is why didn't mdb_page_search find the DBI's root node? -- -- Howard Chu CTO, Symas Corp. http://www.symas.com Director, Highland Sun http://highlandsun.com/hyc/ Chief Architect, OpenLDAP http://www.openldap.org/project/

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Re: (ITS#7996) Tighten race in ldap_int_initialize
by Armin.Tueting＠tueting-online.com 18 Jun '19

18 Jun '19

Am Montag, den 17.06.2019, 15:40 -0700 schrieb Quanah Gibson-Mount: > --On Monday, June 17, 2019 7:16 PM +0200 Armin T=C3=BCting=20 > <Armin.Tueting(a)tueting-online.com> wrote: >=20 > > > I.e., it started and then got as far as reading your ldap.conf file. > > > What is the contents of ldap.conf? > > Attached 'ldap.conf'. Nothing unusual... > >=20 > > > Have you run the test suite (make test)? Does it pass? fail? > > Attached 'make_test.txt'. As far as I can see - it has been passed. >=20 > Ok, so make test passes without issue, so it would appear there's somethi= ng=20 > specific with your configuration that is triggering the problem. Would y= ou=20 > be able to provide your slapd configuration (minus any passwords and the= =20 > like)? I'll privately send it to you in a seperate email. >=20 > Additionally, if you could get a full gdb backtrace of the hung slapd=20 > process that would be useful as well. I.e.: >=20 > start up slapd > gdb /path/to/slapd <pid #> (gdb) thr apply all bt full Thread 1 (Thread 0x7ffa4ad71880 (LWP 9207)): #0 0x00007ffa4918c4ed in __lll_lock_wait () from /lib64/libpthread.so.0 No symbol table info available. #1 0x00007ffa49187dcb in _L_lock_883 () from /lib64/libpthread.so.0 No symbol table info available. #2 0x00007ffa49187c98 in pthread_mutex_lock () from /lib64/libpthread.so.0 No symbol table info available. #3 0x00007ffa4a92a135 in ldap_pvt_thread_mutex_lock (mutex=3D<optimized out>) at thr_posix.c:296 No locals. #4 0x00007ffa4a944e6e in ldap_set_option (ld=3Dld@entry=3D0x0,=20 option=3Doption@entry=3D20486, invalue=3Dinvalue@entry=3D0x7ffdceb7aeb4) at options.c:465 lo =3D 0x7176c0 <ldap_int_global_options> dbglvl =3D 0x0 rc =3D -1 __PRETTY_FUNCTION__ =3D "ldap_set_option" #5 0x00007ffa4a943ed3 in openldap_ldap_init_w_conf (file=3Dfile@entry=3D0x 7ffa4a95a750 "/opt/openldap/etc/openldap/ldap.conf",=20 userconf=3Duserconf@entry=3D0) at init.c:270 p =3D <optimized out> linebuf =3D "URI\000ldap://localhost/\000\000tions\n\000ware/man.cgi?query=3Dldap.con f\n\000ldapusingtlswithsshapasswords\n\000\000\377\377\000\000\177\003" , '\000' <repeats 22 times>, "\200\037\000\000\377\377", '\000' <repeats 152 times>... fp =3D 0x8177b0 i =3D <optimized out> opt =3D 0x7ffdceb7aeb4 "ldap://localhost/" start =3D 0x7ffdceb7aeb4 "ldap://localhost/" end =3D <optimized out> gopts =3D 0x7ffa4ab67120 <ldap_int_global_options> #6 0x00007ffa4a944318 in openldap_ldap_init_w_sysconf (file=3D0x7ffa4a95a750 "/opt/openldap/etc/openldap/ldap.conf") at init.c:316 No locals. #7 ldap_int_initialize (gopts=3Dgopts@entry=3D0x7176c0 <ldap_int_global_options>, dbglvl=3Ddbglvl@entry=3D0x719050 <slap_debug>) at init.c:684 No locals. #8 0x00007ffa4a944e38 in ldap_set_option (ld=3D0x0, option=3D20481, invalue=3D0x719050 <slap_debug>) at options.c:450 lo =3D <optimized out> dbglvl =3D 0x719050 <slap_debug> rc =3D -1 __PRETTY_FUNCTION__ =3D "ldap_set_option" #9 0x0000000000413cd6 in main () No symbol table info available. > at the gdb prompt: >=20 > thr apply all bt full >=20 > Thanks! >=20 > --Quanah >=20 >=20 >=20 > -- >=20 > Quanah Gibson-Mount > Product Architect > Symas Corporation > Packaged, certified, and supported LDAP solutions powered by OpenLDAP: > <http://www.symas.com> >=20

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Re: (ITS#7996) Tighten race in ldap_int_initialize
by Armin.Tueting＠tueting-online.com 18 Jun '19

18 Jun '19

Am Montag, den 17.06.2019, 15:40 -0700 schrieb Quanah Gibson-Mount: > --On Monday, June 17, 2019 7:16 PM +0200 Armin T=C3=BCting=20 > <Armin.Tueting(a)tueting-online.com> wrote: >=20 > > > I.e., it started and then got as far as reading your ldap.conf file. > > > What is the contents of ldap.conf? > > Attached 'ldap.conf'. Nothing unusual... > >=20 > > > Have you run the test suite (make test)? Does it pass? fail? > > Attached 'make_test.txt'. As far as I can see - it has been passed. >=20 > Ok, so make test passes without issue, so it would appear there's somethi= ng=20 > specific with your configuration that is triggering the problem. Would y= ou=20 > be able to provide your slapd configuration (minus any passwords and the= =20 > like)? I'll privately send it to you in a seperate email. >=20 > Additionally, if you could get a full gdb backtrace of the hung slapd=20 > process that would be useful as well. I.e.: >=20 > start up slapd > gdb /path/to/slapd <pid #> (gdb) thr apply all bt full Thread 1 (Thread 0x7ffa4ad71880 (LWP 9207)): #0 0x00007ffa4918c4ed in __lll_lock_wait () from /lib64/libpthread.so.0 No symbol table info available. #1 0x00007ffa49187dcb in _L_lock_883 () from /lib64/libpthread.so.0 No symbol table info available. #2 0x00007ffa49187c98 in pthread_mutex_lock () from /lib64/libpthread.so.0 No symbol table info available. #3 0x00007ffa4a92a135 in ldap_pvt_thread_mutex_lock (mutex=3D<optimized out>) at thr_posix.c:296 No locals. #4 0x00007ffa4a944e6e in ldap_set_option (ld=3Dld@entry=3D0x0,=20 option=3Doption@entry=3D20486, invalue=3Dinvalue@entry=3D0x7ffdceb7aeb4) at options.c:465 lo =3D 0x7176c0 <ldap_int_global_options> dbglvl =3D 0x0 rc =3D -1 __PRETTY_FUNCTION__ =3D "ldap_set_option" #5 0x00007ffa4a943ed3 in openldap_ldap_init_w_conf (file=3Dfile@entry=3D0x 7ffa4a95a750 "/opt/openldap/etc/openldap/ldap.conf",=20 userconf=3Duserconf@entry=3D0) at init.c:270 p =3D <optimized out> linebuf =3D "URI\000ldap://localhost/\000\000tions\n\000ware/man.cgi?query=3Dldap.con f\n\000ldapusingtlswithsshapasswords\n\000\000\377\377\000\000\177\003" , '\000' <repeats 22 times>, "\200\037\000\000\377\377", '\000' <repeats 152 times>... fp =3D 0x8177b0 i =3D <optimized out> opt =3D 0x7ffdceb7aeb4 "ldap://localhost/" start =3D 0x7ffdceb7aeb4 "ldap://localhost/" end =3D <optimized out> gopts =3D 0x7ffa4ab67120 <ldap_int_global_options> #6 0x00007ffa4a944318 in openldap_ldap_init_w_sysconf (file=3D0x7ffa4a95a750 "/opt/openldap/etc/openldap/ldap.conf") at init.c:316 No locals. #7 ldap_int_initialize (gopts=3Dgopts@entry=3D0x7176c0 <ldap_int_global_options>, dbglvl=3Ddbglvl@entry=3D0x719050 <slap_debug>) at init.c:684 No locals. #8 0x00007ffa4a944e38 in ldap_set_option (ld=3D0x0, option=3D20481, invalue=3D0x719050 <slap_debug>) at options.c:450 lo =3D <optimized out> dbglvl =3D 0x719050 <slap_debug> rc =3D -1 __PRETTY_FUNCTION__ =3D "ldap_set_option" #9 0x0000000000413cd6 in main () No symbol table info available. > at the gdb prompt: >=20 > thr apply all bt full >=20 > Thanks! >=20 > --Quanah >=20 >=20 >=20 > -- >=20 > Quanah Gibson-Mount > Product Architect > Symas Corporation > Packaged, certified, and supported LDAP solutions powered by OpenLDAP: > <http://www.symas.com> >=20

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RE: (ITS#9037) observing crash in mdb_cursor_put()
by grobins＠pulsesecure.net 18 Jun '19

18 Jun '19

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1 0

Re: (ITS#9037) observing crash in mdb_cursor_put()
by myk＠mykzilla.org 18 Jun '19

18 Jun '19

hyc(a)symas.com wrote on 2019-06-17 05:25: > grobins(a)pulsesecure.net wrote: >> I am seeing LMDB crash, please find the stack trace. >> >> #0 0x009e362e in mdb_cursor_put (mc=0xffd59bb8, key=0xffd59d14, >> data=0xffd59d0c, flags=0) at mdb.c:6688 >> #1 0x009e48ec in mdb_put (txn=0xd74d3008, dbi=2, key=0xffd59d14, >> data=0xffd59d0c, flags=0) at mdb.c:8771 >> … >> >> Anybody has seen similar issue before? > Doesn't sound familiar. But 0.9.18 is quite old. If you can reproduce this > issue in 0.9.23 then we'll take a look. Test code to reproduce the problem > would also be needed. I'm seeing this in Firefox, which uses LMDB 0.9.23 (with minor changes). Line 6688 in 0.9.18 occurs at line 6938 in 0.9.23 (line 6937 in Firefox since we landed ITS#9030), and that's where we see crashes. I haven't reported it here yet because I haven't been able to confirm that it's a bug in LMDB as opposed to my own code. In fact I haven't been able to reproduce it at all, I've only seen it in crash reports submitted by Firefox installations (almost exclusively on Windows). So I don't have test code to reproduce the problem. Nevertheless, FWIW, here's the Firefox bug that tracks the issue: https://bugzilla.mozilla.org/show_bug.cgi?id=1538541. And here are its crash reports: https://crash-stats.mozilla.org/signature/?signature=mdb_cursor_put (only the last seven days of reports shown by default, but this has been happening since we started using LMDB in Firefox nightly builds a couple of months ago). I've examined some of the dumps, and mc->mc_top is 0 when the crash occurs, while mc->mc_pg[0] is a NULL pointer. So presumably the crash occurs because IS_LEAF2 tries to dereference mc->mc_pg[mc->mc_top]. Further investigation shows that insert_data and insert_key are both MDB_NOTFOUND, and flags is 0, so it isn't MDB_CURRENT, nor does it contain MDB_APPEND. If I understand the code in mdb_cursor_put correctly, this means that mdb_cursor_set was called on line 6614. And mdb_cursor_set is in the stack of another crash I've been investigating in mdb_page_search_root (https://bugzilla.mozilla.org/show_bug.cgi?id=1550174, https://crash-stats.mozilla.org/signature/?signature=mdb_page_search_root), which happens on all of Firefox's primary platforms (Windows, macOS, Linux). But I haven't been able to reproduce that one either, on any of those platforms, so I have no idea if they're related (nor if mdb_cursor_set is even implicated in this crash). And I still can't say that either is an LMDB bug. -myk

1 0

Re: (ITS#7996) Tighten race in ldap_int_initialize
by quanah＠symas.com 18 Jun '19

18 Jun '19

--On Monday, June 17, 2019 7:16 PM +0200 Armin T=C3=BCting=20 <Armin.Tueting(a)tueting-online.com> wrote: >> I.e., it started and then got as far as reading your ldap.conf file. >> What is the contents of ldap.conf? > Attached 'ldap.conf'. Nothing unusual... > >> Have you run the test suite (make test)? Does it pass? fail? > Attached 'make_test.txt'. As far as I can see - it has been passed. Ok, so make test passes without issue, so it would appear there's something = specific with your configuration that is triggering the problem. Would you = be able to provide your slapd configuration (minus any passwords and the=20 like)? Additionally, if you could get a full gdb backtrace of the hung slapd=20 process that would be useful as well. I.e.: start up slapd gdb /path/to/slapd <pid #> at the gdb prompt: thr apply all bt full Thanks! --Quanah -- Quanah Gibson-Mount Product Architect Symas Corporation Packaged, certified, and supported LDAP solutions powered by OpenLDAP: <http://www.symas.com>

1 0

Re: (ITS#9017) Improving performance of commit sync in Windows
by kriszyp＠gmail.com 17 Jun '19

17 Jun '19

--000000000000db50ce058b89ac2f Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Is this still being considered/reviewed? Let me know if there are any other changes you would like me to make. This patch has continued to yield significant and reliable performance improvements for us, and seems like it would be nice for this to be available for other Windows users. On Fri, May 3, 2019 at 3:52 PM Kris Zyp <kriszyp(a)gmail.com> wrote: > For the sake of putting this in the email thread (other code discussion i= n > GitHub), here is the latest squashed commit of the proposed patch (with t= he > on-demand, retained overlapped array to reduce re-malloc and opening even= t > handles): > https://github.com/kriszyp/node-lmdb/commit/726a9156662c703bf3d453aab75ee= 222072b990f > > > > Thanks, > Kris > > > > *From: *Kris Zyp <kriszyp(a)gmail.com> > *Sent: *April 30, 2019 12:43 PM > *To: *Howard Chu <hyc(a)symas.com>; openldap-its(a)OpenLDAP.org > *Subject: *RE: (ITS#9017) Improving performance of commit sync in Windows > > > > > What is the point of using writemap mode if you still need to use > WriteFile > > > on every individual page? > > > > As I understood from the documentation, and have observed, using writemap > mode is faster (and uses less temporary memory) because it doesn=E2=80=99= t require > mallocs to allocate pages (docs: =E2=80=9CThis is faster and uses fewer m= allocs=E2=80=9D). > To be clear though, LMDB is so incredibly fast and efficient, that in > sync-mode, it takes enormous transactions before the time spent allocatin= g > and creating the dirty pages with the updated b-tree is anywhere even > remotely close to the time it takes to wait for disk flushing, even with = an > SSD. But the more pertinent question is efficiency, and measuring CPU > cycles rather than time spent (efficiency is more important than just tim= e > spent). When I ran my tests this morning of 100 (sync) transactions with > 100 puts per transaction, times varied quite a bit, but it seemed like > running with writemap enabled typically averages about 500ms of CPU and > with writemap disabled it typically averages around 600ms. Not a huge > difference, but still definitely worthwhile, I think. > > > > Caveat emptor: Measuring LMDB performance with sync interactions on > Windows is one of the most frustratingly erratic things to measure. It is > sunny outside right now, times could be different when it starts raining > later, but, this is what I saw this morning... > > > > > What is the performance difference between your patch using writemap, > and just > > > not using writemap in the first place? > > > > Running 1000 sync transactions on 3GB db with a single put per > transaction, without writemap map, without the patch took about 60 second= s. > And it took about 1 second with the patch with writemap mode enabled! > (there is no significant difference in sync times with writemap enabled o= r > disabled with the patch.) So the difference was huge in my test. And not > only that, without the patch, the CPU usage was actually _*higher*_ > during that 60 seconds (close to 100% of a core) than during the executio= n > with the patch for one second (close to 50%). Anyway, there are certainl= y > tests I have run where the differences are not as large (doing small > commits on large dbs accentuates the differences), but the patch always > seems to win. It could also be that my particular configuration causes > bigger differences (on an SSD drive, and maybe a more fragmented file?). > > > > Anyway, I added error handling for the malloc, and fixed/changed the othe= r > things you suggested. Be happy to make any other changes you want. The > updated patch is here: > > > https://github.com/kriszyp/node-lmdb/commit/25366dea9453749cf6637f43ec17b= 9b62094acde > > > > > OVERLAPPED* ov =3D malloc((pagecount - keep) * sizeof(OVERLAPPED)); > > > Probably this ought to just be pre-allocated based on the maximum > number of dirty pages a txn allows. > > > > I wasn=E2=80=99t sure I understood this comment. Are you suggesting we ma= lloc(MDB_IDL_UM_MAX > * sizeof(OVERLAPPED)) for each environment, and retain it for the life of > the environment? I think that is 4MB, if my math is right, which seems li= ke > a lot of memory to keep allocated (we usually have a lot of open > environments). If the goal is to reduce the number of mallocs, how about = we > retain the OVERLAPPED array, and only free and re-malloc if the previous > allocation wasn=E2=80=99t large enough? Then there isn=E2=80=99t unnecess= ary allocation, > and we only malloc when there is a bigger transaction than any previous. = I > put this together in a separate commit, as I wasn=E2=80=99t sure if this = what you > wanted (can squash if you prefer): > https://github.com/kriszyp/node-lmdb/commit/2fe68fb5269c843e2e789746a17a4= b2adefaac40 > > > > Thank you for the review! > > > > Thanks, > Kris > > > > *From: *Howard Chu <hyc(a)symas.com> > *Sent: *April 30, 2019 7:12 AM > *To: *kriszyp(a)gmail.com; openldap-its(a)OpenLDAP.org > *Subject: *Re: (ITS#9017) Improving performance of commit sync in Windows > > > > kriszyp(a)gmail.com wrote: > > > Full_Name: Kristopher William Zyp > > > Version: LMDB 0.9.23 > > > OS: Windows > > > URL: > https://github.com/kriszyp/node-lmdb/commit/7ff525ae57684a163d32af74a0ab9= 332b7fc4ce9 > > > Submission from: (NULL) (71.199.6.148) > > > > > > > > > We have seen very poor performance on the sync of commits on large > databases in > > > Windows. On databases with 2GB of data, in writemap mode, the sync of > even small > > > commits is consistently well over 100ms (without writemap it is faster, > but > > > still slow). It is expected that a sync should take some time while > waiting for > > > disk confirmation of the writes, but more concerning is that these sync > > > operations (in writemap mode) are instead dominated by nearly 100% > system CPU > > > utilization, so operations that requires sub-millisecond b-tree update > > > operations are then dominated by very large amounts of system CPU cycle= s > during > > > the sync phase. > > > > > > I think that the fundamental problem is that FlushViewOfFile seems to b= e > an O(n) > > > operation where n is the size of the file (or map). I presume that > Windows is > > > scanning the entire map/file for dirty pages to flush, I'm guessing > because it > > > doesn't have an internal index of all the dirty pages for every > file/map-view in > > > the OS disk cache. Therefore, the turns into an extremely expensive, > CPU-bound > > > operation to find the dirty pages for (large file) and initiate their > writes, > > > which, of course, is contrary to the whole goal of a scalable database > system. > > > And FlushFileBuffers is also relatively slow as well. We have attempted > to batch > > > as many operations into single transaction as possible, but this is > still a very > > > large overhead. > > > > > > The Windows docs for FlushFileBuffers itself warns about the > inefficiencies of > > > this function ( > https://docs.microsoft.com/en-us/windows/desktop/api/fileapi/nf-fileapi-f= lushfilebuffers > ). > > > Which also points to the solution: it is much faster to write out the > dirty > > > pages with WriteFile through a sync file handle > (FILE_FLAG_WRITE_THROUGH). > > > > > > The associated patch > > > ( > https://github.com/kriszyp/node-lmdb/commit/7ff525ae57684a163d32af74a0ab9= 332b7fc4ce9 > ) > > > is my attempt at implementing this solution, for Windows. Fortunately, > with the > > > design of LMDB, this is relatively straightforward. LMDB already suppor= ts > > > writing out dirty pages with WriteFile calls. I added a write-through > handle for > > > sending these writes directly to disk. I then made that file-handle > > > overlapped/asynchronously, so all the writes for a commit could be > started in > > > overlap mode, and (at least theoretically) transfer in parallel to the > drive and > > > then used GetOverlappedResult to wait for the completion. So basically > > > mdb_page_flush becomes the sync. I extended the writing of dirty pages > through > > > WriteFile to writemap mode as well (for writing meta too), so that > WriteFile > > > with write-through can be used to flush the data without ever needing t= o > call > > > FlushViewOfFile or FlushFileBuffers. I also implemented support for wri= te > > > gathering in writemap mode where contiguous file positions infers > contiguous > > > memory (by tracking the starting position with wdp and writing > contiguous pages > > > in single operations). Sorting of the dirty list is maintained even in > writemap > > > mode for this purpose. > > > > What is the point of using writemap mode if you still need to use WriteFi= le > > on every individual page? > > > > > The performance benefits of this patch, in my testing, are considerable= . > Writing > > > out/syncing transactions is typically over 5x faster in writemap mode, > and 2x > > > faster in standard mode. And perhaps more importantly (especially in > environment > > > with many threads/processes), the efficiency benefits are even larger, > > > particularly in writemap mode, where there can be a 50-100x reduction i= n > the > > > system CPU usage by using this patch. This brings windows performance > with > > > sync'ed transactions in LMDB back into the range of "lightning" > performance :). > > > > What is the performance difference between your patch using writemap, and > just > > not using writemap in the first place? > > > > -- > > -- Howard Chu > > CTO, Symas Corp. http://www.symas.com > > Director, Highland Sun http://highlandsun.com/hyc/ > > Chief Architect, OpenLDAP http://www.openldap.org/project/ > > > > > --000000000000db50ce058b89ac2f Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr">Is this still being considered/reviewed? Let me know if th= ere are any other changes you would like me to make. This patch has continu= ed to yield significant and reliable performance improvements for us, and s= eems like it would be nice for this to be available for other Windows users= .</div> <div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr"= >On Fri, May 3, 2019 at 3:52 PM Kris Zyp <<a href=3D"mailto:kriszyp@gmai= l.com">kriszyp(a)gmail.com</a>> wrote: </div><blockquote class=3D"gmail= _quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204= ,204);padding-left:1ex"><div lang=3D"EN-CA"><div class=3D"gmail-m_524243755= 9147988140WordSection1">For the sake of putting this= in the email thread (other code discussion in GitHub), here is the latest = squashed commit of the proposed patch (with the on-demand, retained overlap= ped array to reduce re-malloc and opening event handles): <a href=3D"https:= //github.com/kriszyp/node-lmdb/commit/726a9156662c703bf3d453aab75ee222072b9= 90f" target=3D"_blank">https://github.com/kriszyp/node-lmdb/commit/726a9156= 662c703bf3d453aab75ee222072b990f</a>=C2= =A0Thanks, Kris=C2=A0<div style=3D"border-right:none;border-bottom:n= one;border-left:none;border-top:1pt solid rgb(225,225,225);padding:3pt 0cm = 0cm">From: = <a href=3D"mailto:kriszyp@gmail.com" target=3D"_blank">Kris Zyp</a> S= ent: April 30, 2019 12:43 PM To: <a href=3D"mailto:hyc@symas.= com" target=3D"_blank">Howard Chu</a>; <a href=3D"mailto:openldap-its@OpenL= DAP.org" target=3D"_blank">openldap-its(a)OpenLDAP.org</a> Subject: </b= >RE: (ITS#9017) Improving performance of commit sync in Windows</div><p= class=3D"MsoNormal">=C2=A0> Wh= at is the point of using writemap mode if you still need to use WriteFile<u= >> on every individual page?</u= >=C2=A0As I understood from the documentation, and have observed, using wri= temap mode is faster (and uses less temporary memory) because it doesn=E2= =80=99t require mallocs to allocate pages (docs: =E2=80=9CThis is faster an= d uses fewer mallocs=E2=80=9D). To be clear though, LMDB is so incredibly f= ast and efficient, that in sync-mode, it takes enormous transactions before= the time spent allocating and creating the dirty pages with the updated b-= tree is anywhere even remotely close to the time it takes to wait for disk = flushing, even with an SSD. But the more pertinent question is efficiency, = and measuring CPU cycles rather than time spent (efficiency is more importa= nt than just time spent). When I ran my tests this morning of 100 (sync) tr= ansactions with 100 puts per transaction, times varied quite a bit, but it = seemed like running with writemap enabled typically averages about 500ms of= CPU and with writemap disabled it typically averages around 600ms. Not a h= uge difference, but still definitely worthwhile, I think.= =C2=A0Cavea= t emptor: Measuring LMDB performance with sync interactions on Windows is o= ne of the most frustratingly erratic things to measure. It is sunny outside= right now, times could be different when it starts raining later, but, thi= s is what I saw this morning...= =C2=A0> What is the performance di= fference between your patch using writemap, and just> not using writemap in the first place?= =C2=A0R= unning 1000 sync transactions on 3GB db with a single put per transaction, = without writemap map, without the patch took about 60 seconds. And it took = about 1 second with the patch with writemap mode enabled! (there is no sign= ificant difference in sync times with writemap enabled or disabled with the= patch.) So the difference was huge in my test. And not only that, without = the patch, the CPU usage was actually _higher_ during that 60 second= s (close to 100% of a core) than during the execution with the patch for on= e second (close to 50%).=C2=A0 Anyway, there are certainly tests I have run= where the differences are not as large (doing small commits on large dbs a= ccentuates the differences), but the patch always seems to win. It could al= so be that my particular configuration causes bigger differences (on an SSD= drive, and maybe a more fragmented file?).=C2=A0Anyway, I added err= or handling for the malloc, and fixed/changed the other things you suggeste= d. Be happy to make any other changes you want. The updated patch is here:<= u><a href=3D"https://github.com/krisz= yp/node-lmdb/commit/25366dea9453749cf6637f43ec17b9b62094acde" target=3D"_bl= ank">https://github.com/kriszyp/node-lmdb/commit/25366dea9453749cf6637f43ec= 17b9b62094acde</a>=C2=A0= > OVERLAPPED* ov =3D malloc((pagecount - keep) * sizeof(OVERLAPPED));<= span style=3D"font-size:9pt;font-family:Consolas;color:rgb(36,41,46)">> = Probably this ought to= just be pre-allocated based on the maximum number of dirty pages a txn all= ows.=C2=A0<p= class=3D"MsoNormal">I wasn=E2=80=99= t sure I understood this comment. Are you suggesting we malloc(MDB_I= DL_UM_MAX * sizeof(OVERLAPPED)) for each environment, and retain it for the= life of the environment? I think that is 4MB, if my math is right, which s= eems like a lot of memory to keep allocated (we usually have a lot of open = environments). If the goal is to reduce the number of mallocs, how about we= retain the OVERLAPPED array, and only free and re-malloc if the previous a= llocation wasn=E2=80=99t large enough? Then there isn=E2=80=99t unnecessary= allocation, and we only malloc when there is a bigger transaction than any= previous. I put this together in a separate commit, as I wasn=E2=80=99t su= re if this what you wanted (can squash if you prefer): <a href=3D"https://g= ithub.com/kriszyp/node-lmdb/commit/2fe68fb5269c843e2e789746a17a4b2adefaac40= " target=3D"_blank">https://github.com/kriszyp/node-lmdb/commit/2fe68fb5269= c843e2e789746a17a4b2adefaac40</a><= u>=C2=A0Thank you for the review! <sp= an style=3D"font-size:10.5pt;font-family:"Segoe UI",sans-serif;co= lor:rgb(36,41,46);background:white">=C2=A0Thanks, Kris<= /u>=C2=A0<div style=3D"= border-right:none;border-bottom:none;border-left:none;border-top:1pt solid = rgb(225,225,225);padding:3pt 0cm 0cm">From: <= a href=3D"mailto:hyc@symas.com" target=3D"_blank">Howard Chu</a> Sent= : April 30, 2019 7:12 AM To: <a href=3D"mailto:kriszyp@gmail.= com" target=3D"_blank">kriszyp(a)gmail.com</a>; <a href=3D"mailto:openldap-it= s(a)OpenLDAP.org" target=3D"_blank">openldap-its(a)OpenLDAP.org</a> Subje= ct: Re: (ITS#9017) Improving performance of commit sync in Windows</= u></div>=C2=A0<a href=3D"mailto:kriszyp@gmail.com" target=3D"_blank">krisz= yp(a)gmail.com</a> wrote:> Full_N= ame: Kristopher William Zyp> Ve= rsion: LMDB 0.9.23> OS: Windows= > URL: <a href=3D"https://githu= b.com/kriszyp/node-lmdb/commit/7ff525ae57684a163d32af74a0ab9332b7fc4ce9" ta= rget=3D"_blank">https://github.com/kriszyp/node-lmdb/commit/7ff525ae57684a1= 63d32af74a0ab9332b7fc4ce9</a>> = Submission from: (NULL) (71.199.6.148)> > <p= class=3D"MsoNormal">> We have seen very poor performance on the sync of= commits on large databases in>= Windows. On databases with 2GB of data, in writemap mode, the sync of even= small> commits is consistently= well over 100ms (without writemap it is faster, but> still slow). It is expected that a sync should take = some time while waiting for> di= sk confirmation of the writes, but more concerning is that these sync</u= >> operations (in writemap mode) are i= nstead dominated by nearly 100% system CPU> utilization, so operations that requires sub-millisecond b-tre= e update> operations are then d= ominated by very large amounts of system CPU cycles during</p= >> the sync phase.> > I think that t= he fundamental problem is that FlushViewOfFile seems to be an O(n)<u= >> operation where n is the size of the f= ile (or map). I presume that Windows is> scanning the entire map/file for dirty pages to flush, I'm gu= essing because it> doesn't = have an internal index of all the dirty pages for every file/map-view in= > the OS disk cache. Therefore, th= e turns into an extremely expensive, CPU-bound> operation to find the dirty pages for (large file) and ini= tiate their writes,> which, of = course, is contrary to the whole goal of a scalable database system.= > And FlushFileBuffers is also relativ= ely slow as well. We have attempted to batch> as many operations into single transaction as possible, but = this is still a very> large ove= rhead.> > The Windows docs for FlushFileBuffers itself warns a= bout the inefficiencies of> thi= s function (<a href=3D"https://docs.microsoft.com/en-us/windows/desktop/api= /fileapi/nf-fileapi-flushfilebuffers" target=3D"_blank">https://docs.micros= oft.com/en-us/windows/desktop/api/fileapi/nf-fileapi-flushfilebuffers</a>).= > Which also points to the solu= tion: it is much faster to write out the dirty> pages with WriteFile through a sync file handle (FILE_FLAG= _WRITE_THROUGH).> </u= >> The associated patch> (<a href=3D"https://github.com/kriszyp/node-lmdb/co= mmit/7ff525ae57684a163d32af74a0ab9332b7fc4ce9" target=3D"_blank">https://gi= thub.com/kriszyp/node-lmdb/commit/7ff525ae57684a163d32af74a0ab9332b7fc4ce9<= /a>)> is my attempt at implemen= ting this solution, for Windows. Fortunately, with the> design of LMDB, this is relatively straightforward= . LMDB already supports> writin= g out dirty pages with WriteFile calls. I added a write-through handle for<= u>> sending these writes directly = to disk. I then made that file-handle> overlapped/asynchronously, so all the writes for a commit could be = started in> overlap mode, and (= at least theoretically) transfer in parallel to the drive and= > then used GetOverlappedResult to wait for t= he completion. So basically> md= b_page_flush becomes the sync. I extended the writing of dirty pages throug= h> WriteFile to writemap mode a= s well (for writing meta too), so that WriteFile> with write-through can be used to flush the data withou= t ever needing to call> FlushVi= ewOfFile or FlushFileBuffers. I also implemented support for write<u= >> gathering in writemap mode where conti= guous file positions infers contiguous> memory (by tracking the starting position with wdp and writing con= tiguous pages> in single operat= ions). Sorting of the dirty list is maintained even in writemap</= u>> mode for this purpose.<= p class=3D"MsoNormal">=C2=A0What i= s the point of using writemap mode if you still need to use WriteFile</u= >on every individual page?<= /p>=C2=A0&g= t; The performance benefits of this patch, in my testing, are considerable.= Writing> out/syncing transacti= ons is typically over 5x faster in writemap mode, and 2x<= p class=3D"MsoNormal">> faster in standard mode. And perhaps more import= antly (especially in environment&g= t; with many threads/processes), the efficiency benefits are even larger,<u= >> particularly in writemap mode, = where there can be a 50-100x reduction in the> system CPU usage by using this patch. This brings windows p= erformance with> sync'ed tr= ansactions in LMDB back into the range of "lightning" performance= :).=C2=A0What is the performance difference between your patch usin= g writemap, and justnot using writ= emap in the first place?=C2= =A0-- =C2=A0=C2=A0-- Howard Chu=C2= =A0 CTO, Symas Corp.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0 <a href=3D"http://www.symas.com" target=3D"_blank">http://www.symas.= com</a>=C2=A0 Director, Highland S= un=C2=A0=C2=A0=C2=A0=C2=A0 <a href=3D"http://highlandsun.com/hyc/" target= =3D"_blank">http://highlandsun.com/hyc/</a>=C2=A0 Chief Architect, OpenLDAP=C2=A0 <a href=3D"http://www.openl= dap.org/project/" target=3D"_blank">http://www.openldap.org/project/</a>= =C2=A0=C2=A0</div></div></blockquote></div> --000000000000db50ce058b89ac2f--

1 0

Re: (ITS#7996) Tighten race in ldap_int_initialize
by Armin.Tueting＠tueting-online.com 17 Jun '19

17 Jun '19

--=-8DPiL0uhzCLRgMdCXb4w Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Am Montag, den 17.06.2019, 07:41 -0700 schrieb Quanah Gibson-Mount: > --On Monday, June 17, 2019 9:59 AM +0200 Armin T=C3=BCting=20 > <Armin.Tueting(a)tueting-online.com> wrote: >=20 > > > > Hi, > > > >=20 > > > > Thanks for the report. When reporting issues, please keep them on > > > > the=3D20 OpenLDAP bug tracking list, rather than directly emailing > > > > individuals. > > > You will need to provide substantially more information about what > > > you're seeing. I would start with starting slapd in full debug mode > > > (add -d -1 to the startup flags to slapd) and see what issue(s) it > > > reports. > > Slapd won't even start at all! No log! > > I'm attaching the redirected output from 'make test'. In addition the > > 'config.log' and 'slapd_start.txt'. >=20 > Hi Armin, >=20 > Again, I will please ask you CC replies to the OpenLDAP ITS list=20 > (openldap-its(a)openldap.org) so they properly get entered into the issue= =20 > tracker. >=20 > Your slapd_start.txt attachment clearly shows slapd starting: >=20 > time /opt/openldap/libexec/slapd -F /opt/openldap/etc/openldap/slapd.d -u= =20 > ldap -h "ldapi:/// ldap:/// ldaps:///" -d -1=20 >=20 > ldap_url_parse_ext(ldap://localhost/) > ldap_init: trying /opt/openldap/etc/openldap/ldap.conf > ldap_init: using /opt/openldap/etc/openldap/ldap.conf > ^C >=20 >=20 > I.e., it started and then got as far as reading your ldap.conf file. Wha= t=20 > is the contents of ldap.conf? Attached 'ldap.conf'. Nothing unusual... > Have you run the test suite (make test)? Does it pass? fail? Attached 'make_test.txt'. As far as I can see - it has been passed. > Thanks, > Quanah >=20 > -- >=20 > Quanah Gibson-Mount > Product Architect > Symas Corporation > Packaged, certified, and supported LDAP solutions powered by OpenLDAP: > <http://www.symas.com> >=20 --=-8DPiL0uhzCLRgMdCXb4w Content-Disposition: attachment; filename="ldap.conf" Content-Type: text/plain; name="ldap.conf"; charset="UTF-8" Content-Transfer-Encoding: base64 IyBodHRwczovL3NpdGVzLmdvb2dsZS5jb20vc2l0ZS9ndWVudGVyYmFydHNjaC9ibG9nL2NlbnRv czU2bGRhcHVzaW5ndGxzd2l0aHNzaGFwYXNzd29yZHMKIyBodHRwOi8vd3d3Lm9wZW5sZGFwLm9y Zy9zb2Z0d2FyZS9tYW4uY2dpP3F1ZXJ5PWxkYXAuY29uZgoKIyBHZW5lcmFsIGNvbm5lY3Rpb24g b3B0aW9ucwpVUkkgbGRhcDovL2xvY2FsaG9zdC8KCiMgU2VhcmNoL21hcHBpbmcgb3B0aW9ucwpC QVNFIGRjPWFybWluLXR1ZXRpbmcsZGM9bG9jYWwKCiMgVGltaW5nL3JlY29ubmVjdCBvcHRpb25z ClRJTUVMSU1JVCAxMApUSU1FT1VUIDMwCgojIFNBU0wgb3B0aW9ucwpTQVNMX01FQ0ggRVhURVJO QUwKCiMgU1NML1RMUyBvcHRpb25zClRMU19DQUNFUlQgL2V0Yy9zc2wvQ0FCdW5kbGUuY3J0ClRM 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RE: (ITS#8970) bind fails when length value is multi-byte
by lit＠CBORD.com 17 Jun '19

17 Jun '19

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Re: (ITS#7996) Tighten race in ldap_int_initialize
by quanah＠symas.com 17 Jun '19

17 Jun '19

--On Monday, June 17, 2019 9:59 AM +0200 Armin T=C3=BCting=20 <Armin.Tueting(a)tueting-online.com> wrote: >> > Hi, >> > >> > Thanks for the report. When reporting issues, please keep them on >> > the=3D20 OpenLDAP bug tracking list, rather than directly emailing >> > individuals. >> You will need to provide substantially more information about what >> you're seeing. I would start with starting slapd in full debug mode >> (add -d -1 to the startup flags to slapd) and see what issue(s) it >> reports. > Slapd won't even start at all! No log! > I'm attaching the redirected output from 'make test'. In addition the > 'config.log' and 'slapd_start.txt'. Hi Armin, Again, I will please ask you CC replies to the OpenLDAP ITS list=20 (openldap-its(a)openldap.org) so they properly get entered into the issue=20 tracker. Your slapd_start.txt attachment clearly shows slapd starting: time /opt/openldap/libexec/slapd -F /opt/openldap/etc/openldap/slapd.d -u=20 ldap -h "ldapi:/// ldap:/// ldaps:///" -d -1=20 ldap_url_parse_ext(ldap://localhost/) ldap_init: trying /opt/openldap/etc/openldap/ldap.conf ldap_init: using /opt/openldap/etc/openldap/ldap.conf ^C I.e., it started and then got as far as reading your ldap.conf file. What=20 is the contents of ldap.conf? Have you run the test suite (make test)? Does it pass? fail? Thanks, Quanah -- Quanah Gibson-Mount Product Architect Symas Corporation Packaged, certified, and supported LDAP solutions powered by OpenLDAP: <http://www.symas.com>

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Re: (ITS#9037) observing crash in mdb_cursor_put()
by hyc＠symas.com 17 Jun '19

17 Jun '19

grobins(a)pulsesecure.net wrote: > Full_Name: Robins George > Version: 0.9.18 > OS: Centos > URL: ftp://ftp.openldap.org/incoming/ > Submission from: (NULL) (121.244.154.134) > > > I am seeing LMDB crash, please find the stack trace. > > #0 0x009e362e in mdb_cursor_put (mc=0xffd59bb8, key=0xffd59d14, > data=0xffd59d0c, flags=0) at mdb.c:6688 > #1 0x009e48ec in mdb_put (txn=0xd74d3008, dbi=2, key=0xffd59d14, > data=0xffd59d0c, flags=0) at mdb.c:8771 > #2 0x00f5cef8 in LMDB::LMDBContext::createSession (this=0x80cc610, > sid=0x80cd0fc "sid1422419e5fd6cd224f278d74293c50f5ef96593700000000+") at > lmdbint.cc:460 > #3 0x0805398e in updateLMDB (request=..., forward=@0xffd59fff) at > sessionserver.cc:1154 > #4 processRequestWithoutResponse (request=..., forward=@0xffd59fff) at > sessionserver.cc:1240 > #5 0x08056936 in ZSubHandler::ioReady (this=0xffd5aa1c, fd=20) at > sessionserver.cc:1501 > #6 0x00f870d2 in runCoreDispatcher (default_t=<value optimized out>, flags=-1) > at fds.cc:889 > #7 0x00f87b37 in DSEvntFds::runDispatcher () at fds.cc:945 > #8 0x08056248 in main () at sessionserver.cc:1820 > > Anybody has seen similar issue before? Doesn't sound familiar. But 0.9.18 is quite old. If you can reproduce this issue in 0.9.23 then we'll take a look. Test code to reproduce the problem would also be needed. -- -- Howard Chu CTO, Symas Corp. http://www.symas.com Director, Highland Sun http://highlandsun.com/hyc/ Chief Architect, OpenLDAP http://www.openldap.org/project/

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Re: (ITS#8970) bind fails when length value is multi-byte
by ondra＠mistotebe.net 17 Jun '19

17 Jun '19

Hi Leo, in my tests, everything is handled correctly. Have you been able to reproduce this with an up-to-date version of OpenLDAP? If so, can you provide slapd output (stderr) with -d -1? This is different from slapd syslog output in that libldap/liblber logging is also included. Regards, -- Ondřej Kuzník Senior Software Engineer Symas Corporation http://www.symas.com Packaged, certified, and supported LDAP solutions powered by OpenLDAP

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Re: (ITS#8695) _sleep is deprecated
by hyc＠symas.com 17 Jun '19

17 Jun '19

quanah(a)openldap.org wrote: > Full_Name: Quanah Gibson-Mount > Version: 2.4.45 > OS: Windows 10 64-bit > URL: ftp://ftp.openldap.org/incoming/ > Submission from: (NULL) (47.208.148.239) > > > When building OpenLDAP, we find: > > C:/msys64/home/build/sold-master/openldap/tests/progs/slapd-read.c: In function > 'do_read': > C:/msys64/home/build/sold-master/openldap/tests/progs/slapd-read.c:384:11: > warning: '_sleep' is deprecated [-Wdeprecated-declarations] > sleep( delay ); > ^~~~~ > In file included from > C:/msys64/home/build/sold-master/openldap/include/ac/stdlib.h:26:0, > from > C:/msys64/home/build/sold-master/openldap/tests/progs/slapd-read.c:24: > C:/msys64/mingw64/x86_64-w64-mingw32/include/stdlib.h:613:24: note: declared > here > _CRTIMP void __cdecl _sleep(unsigned long _Duration) > __MINGW_ATTRIB_DEPRECATED; > ^~~~~~ > > This comes from: > > include/ac/unistd.h > > The correct function call is Sleep > > #ifdef _WIN32 > #define sleep Sleep > #endif > > should resolve it. > > Need to be careful here. M$ says the function is supported as of Windows XP https://docs.microsoft.com/en-us/windows/desktop/api/synchapi/nf-synchapi-s… but is not defined in any header files until Windows Vista. Any "fix" should only use Sleep if the current M$ SDK is new enough; the rest of the code still builds on Windows XP. -- -- Howard Chu CTO, Symas Corp. http://www.symas.com Director, Highland Sun http://highlandsun.com/hyc/ Chief Architect, OpenLDAP http://www.openldap.org/project/

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Re: (ITS#8671) Declare ldap_init_fd() in ldap.h to help external consumers
by abokovoy＠redhat.com 17 Jun '19

17 Jun '19

On ma, 17 kesä 2019, Ondřej Kuzník wrote: >On Fri, Jun 14, 2019 at 11:50:20AM +0000, abokovoy(a)redhat.com wrote: >> On pe, 14 kesä 2019, Ondřej Kuzník wrote: >>> Hi Alexander, >>> as of commit 6a5e30674b63b17587738ba9a3d1ea3633c33fb1, OpenLDAP master >>> now ships and installs a new header <openldap.h> that should expose >>> ldap_init_fd(). Could you check this will work for Samba before we apply >>> this change in 2.4? >> Thanks. I've compiled openldap git master and installed it, I can see >> $prefix/include/openldap.h with ldap_init_fd() and man pages have proper >> references to openldap.h. >> >> Looks good to me. Once 2.4 becomes available, we can add support of this >> to Samba. > >Hi Alexander, >this has been integrated into RE24 and should be available with the >2.4.48 release onwards. Great, thank you, Ondřej. -- / Alexander Bokovoy Sr. Principal Software Engineer Security / Identity Management Engineering Red Hat Limited, Finland

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Re: (ITS#8671) Declare ldap_init_fd() in ldap.h to help external consumers
by ondra＠mistotebe.net 17 Jun '19

17 Jun '19

On Fri, Jun 14, 2019 at 11:50:20AM +0000, abokovoy(a)redhat.com wrote: > On pe, 14 kesä 2019, Ondřej Kuzník wrote: >> Hi Alexander, >> as of commit 6a5e30674b63b17587738ba9a3d1ea3633c33fb1, OpenLDAP master >> now ships and installs a new header <openldap.h> that should expose >> ldap_init_fd(). Could you check this will work for Samba before we apply >> this change in 2.4? > Thanks. I've compiled openldap git master and installed it, I can see > $prefix/include/openldap.h with ldap_init_fd() and man pages have proper > references to openldap.h. > > Looks good to me. Once 2.4 becomes available, we can add support of this > to Samba. Hi Alexander, this has been integrated into RE24 and should be available with the 2.4.48 release onwards. Regards, -- Ondřej Kuzník Senior Software Engineer Symas Corporation http://www.symas.com Packaged, certified, and supported LDAP solutions powered by OpenLDAP

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(ITS#9037) observing crash in mdb_cursor_put()
by grobins＠pulsesecure.net 17 Jun '19

17 Jun '19

Full_Name: Robins George Version: 0.9.18 OS: Centos URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (121.244.154.134) I am seeing LMDB crash, please find the stack trace. #0 0x009e362e in mdb_cursor_put (mc=0xffd59bb8, key=0xffd59d14, data=0xffd59d0c, flags=0) at mdb.c:6688 #1 0x009e48ec in mdb_put (txn=0xd74d3008, dbi=2, key=0xffd59d14, data=0xffd59d0c, flags=0) at mdb.c:8771 #2 0x00f5cef8 in LMDB::LMDBContext::createSession (this=0x80cc610, sid=0x80cd0fc "sid1422419e5fd6cd224f278d74293c50f5ef96593700000000+") at lmdbint.cc:460 #3 0x0805398e in updateLMDB (request=..., forward=@0xffd59fff) at sessionserver.cc:1154 #4 processRequestWithoutResponse (request=..., forward=@0xffd59fff) at sessionserver.cc:1240 #5 0x08056936 in ZSubHandler::ioReady (this=0xffd5aa1c, fd=20) at sessionserver.cc:1501 #6 0x00f870d2 in runCoreDispatcher (default_t=<value optimized out>, flags=-1) at fds.cc:889 #7 0x00f87b37 in DSEvntFds::runDispatcher () at fds.cc:945 #8 0x08056248 in main () at sessionserver.cc:1820 Anybody has seen similar issue before?

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Re: (ITS#7996) Tighten race in ldap_int_initialize
by quanah＠symas.com 17 Jun '19

17 Jun '19

--On Sunday, June 16, 2019 7:54 PM +0000 quanah(a)symas.com wrote: > --On Sunday, June 16, 2019 4:06 PM +0200 Armin T=C3=BCting=20 > <Armin.Tueting(a)tueting-online.com> wrote: > >> Hello Quanah, >> >> I'm following OPENLDAP_REL_ENG_2_4. The commit >> 'cde56fad154fcd25e351c3cd84d8173d263b0a01' breaks starting slapd. It >> won't start at all... >> >> I'm using a fairly up-to-date CentOS 7 version... >> 3.10.0-957.21.2.el7.x86_64 #1 SMP Wed Jun 5 14:26:44 UTC 2019 x86_64 > > Hi, > > Thanks for the report. When reporting issues, please keep them on the=20 > OpenLDAP bug tracking list, rather than directly emailing individuals. > > I'm unable to reproduce this with Ubuntu18 (all tests in the test suite=20 > pass via make test, and I can start slapd just fine w/o debug mode). > I'll=20 test on centos7 and see if I can reproduce. I'm also unable to reproduce any issues with current RE24 (0c44b22d3e347f2f05f913e7e3ffa907816574ed) under fully updated Centos7: CentOS Linux release 7.6.1810 (Core) kernel-headers.x86_64 3.10.0-957.21.2.el7 @updates You will need to provide substantially more information about what you're seeing. I would start with starting slapd in full debug mode (add -d -1 to the startup flags to slapd) and see what issue(s) it reports. Regards, Quanah -- Quanah Gibson-Mount Product Architect Symas Corporation Packaged, certified, and supported LDAP solutions powered by OpenLDAP: <http://www.symas.com>

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Re: (ITS#7996) Tighten race in ldap_int_initialize
by quanah＠symas.com 16 Jun '19

16 Jun '19

--On Sunday, June 16, 2019 4:06 PM +0200 Armin T=C3=BCting=20 <Armin.Tueting(a)tueting-online.com> wrote: > Hello Quanah, > > I'm following OPENLDAP_REL_ENG_2_4. The commit > 'cde56fad154fcd25e351c3cd84d8173d263b0a01' breaks starting slapd. It > won't start at all... > > I'm using a fairly up-to-date CentOS 7 version... > 3.10.0-957.21.2.el7.x86_64 #1 SMP Wed Jun 5 14:26:44 UTC 2019 x86_64 Hi, Thanks for the report. When reporting issues, please keep them on the=20 OpenLDAP bug tracking list, rather than directly emailing individuals. I'm unable to reproduce this with Ubuntu18 (all tests in the test suite=20 pass via make test, and I can start slapd just fine w/o debug mode). I'll=20 test on centos7 and see if I can reproduce. --Quanah -- Quanah Gibson-Mount Product Architect Symas Corporation Packaged, certified, and supported LDAP solutions powered by OpenLDAP: <http://www.symas.com>

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Re: (ITS#9035) LDMB: 0.9.23: mdb_env_set_maxreaders() not honoured?
by steffen＠sdaoden.eu 14 Jun '19

14 Jun '19

Howard Chu wrote in <c68dedc0-e022-509b-da5a-e9300d71e39e(a)symas.com>: |steffen(a)sdaoden.eu wrote: |> Full_Name: Steffen Nurpmeso |> Version: 0.9.23 |> OS: Linux |> URL: https://ftp.sdaoden.eu/lmdb-bogo.tar.xz |> Submission from: (NULL) (109.40.130.211) |> |> |> A follow-up to private communication with Quanah Gibson-Mount. |> You can find more in the tarball linked below | |The maxreaders setting doesn't persist after all processes have closed \ |the environment. |Therefore it returns to its default value when the next process opens \ |the environment. | |The code works as designed. There is no bug here. Closing this ITS. Ok. But please let me wonder why it is part of a DB dump, then, if it has nothing to do with the persistent state of a DB, but rather with the coding environment that is recreated each time from scratch. --steffen | |Der Kragenbaer, The moon bear, |der holt sich munter he cheerfully and one by one |einen nach dem anderen runter wa.ks himself off |(By Robert Gernhardt)

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Re: (ITS#9036) LDMB: 0.9.23: mdb_env_info() does not report latest mapsize() after transaction abort
by steffen＠sdaoden.eu 14 Jun '19

14 Jun '19

Howard Chu wrote in <b0311a63-3757-5b69-676a-bd8293e34c1e(a)symas.com>: |steffen(a)sdaoden.eu wrote: |> Full_Name: Steffen Nurpmeso |> Version: 0.9.23 |> OS: Linux |> URL: https://ftp.sdaoden.eu/lmdb-bogo.tar.xz |> Submission from: (NULL) (109.40.130.211) |> |> |> A follow-up to private communication with Quanah Gibson-Mount. |> You can find more in the tarball linked below |> |> |Your README states that the behavior in LMDB 0.9.23 is different than \ |in 0.9.22 but that |is incorrect. No changes to set_mapsize() behavior were made between \ |0.9.22 and 0.9.23. Yeah!! Mind you, i have even looked into the git history once AlpineLinux switched to 0.9.23 and i came to the very same conclusion! But one thing is plain: on AlpineLinux, with musl libc, from July 2018 to January 2019, i ran bogofilter with LMDB 0.9.22 exactly as it is still in bogofilter upstream and on the one branch in the ball i provided under the URL above. Doing monthly dump + rebuild of my spam database to vacuumize the thing. Without any problems. Then after my weekly system upgrade, which (also?) came with LMDB 0.9.23 i suddenly saw crashes, on a Saturday night! You can read the two mails [1,2] if you wanna. [1] https://www.bogofilter.org/pipermail/bogofilter-dev/2019q1/003515.html [2] https://www.bogofilter.org/pipermail/bogofilter-dev/2019q1/003516.html |Closing this ITS. Well ok, if it is so designed that set_mapsize() is not meant to survive a transaction abort, then it may be so. But then it should possibly be documented that after a transaction abort all environmental settings need to be reestablished, as they vanish after an abortion. I.e., that they only become persistent after a successful commit. --steffen | |Der Kragenbaer, The moon bear, |der holt sich munter he cheerfully and one by one |einen nach dem anderen runter wa.ks himself off |(By Robert Gernhardt)

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Re: (ITS#9034) LDMB: 0.9.22/3: initial mdb_env_set_mapsize() is problematic
by steffen＠sdaoden.eu 14 Jun '19

14 Jun '19

Howard Chu wrote in <1c3b8393-3524-311e-0287-d87ef7e2de37(a)symas.com>: |steffen(a)sdaoden.eu wrote: |> Full_Name: Steffen Nurpmeso |> Version: 0.9.23 |> OS: Linux |> URL: https://ftp.sdaoden.eu/lmdb-bogo.tar.xz |> Submission from: (NULL) (109.40.130.211) |> |> |> A follow-up to private communication with Quanah Gibson-Mount. |> You can find more in the tarball linked below. | |The code works as designed. No changes to mapsize handling were made \ |between 0.9.22 and 0.9.23. |Closing this ITS. It did not work with 0.9.22 already. Sorry for the messy README, if you have not read it in its entirety, the long story possibly was too long. But if an initial set_mapsize() causes crashes further on, then this is a design i do not understand. I mean, i have found workarounds (leaving off code) which work stable since one year in two weeks from now, on musl as well as GNU C libraries, and Matthias Andree tested on FreeBSD and Solaris, if i recall correctly, and so it is ok for me. That is all i know. --steffen | |Der Kragenbaer, The moon bear, |der holt sich munter he cheerfully and one by one |einen nach dem anderen runter wa.ks himself off |(By Robert Gernhardt)

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Re: (ITS#8671) Declare ldap_init_fd() in ldap.h to help external consumers
by abokovoy＠redhat.com 14 Jun '19

14 Jun '19

On pe, 14 kesä 2019, Ondřej Kuzník wrote: >On Thu, Oct 19, 2017 at 03:39:24PM +0000, quanah(a)symas.com wrote: >> --On Thursday, October 19, 2017 10:20 AM +0300 Alexander Bokovoy >> <abokovoy(a)redhat.com> wrote: >>> Hi Quanah, >>> >>> On ti, 12 syys 2017, Quanah Gibson-Mount wrote: >>>> Hi Alexander, >>>> >>>> Your submission appears to be missing an IPR statement as noted at >>>> <https://www.openldap.org/devel/contributing.html#notice>. This is >>>> required for your submission to be evaluated. Please add an IPR at >>>> your earliest convenience. >>> Attached is a re-based patch set since there were changes in git master >>> in last month or so that affected the same area. >>> >>> There are two patches: one for git master, one for 2.4 branch. Since >>> there is no functional change in the code, I'd like to see the 2.4 >>> version in an upcoming release as that would greatly help Samba. >>> >>> I'm also including an IPR notice below: >>> >>> Red Hat, Inc. hereby place the following modifications to OpenLDAP >>> Software (and only these modifications) into the public domain. >>> Hence, these modifications may be freely used and/or redistributed >>> for any purpose with or without attribution and/or other notice. >> >> Thanks very much! I'll get this into my scratch repo for review. > >Hi Alexander, >as of commit 6a5e30674b63b17587738ba9a3d1ea3633c33fb1, OpenLDAP master >now ships and installs a new header <openldap.h> that should expose >ldap_init_fd(). Could you check this will work for Samba before we apply >this change in 2.4? Thanks. I've compiled openldap git master and installed it, I can see $prefix/include/openldap.h with ldap_init_fd() and man pages have proper references to openldap.h. Looks good to me. Once 2.4 becomes available, we can add support of this to Samba. -- / Alexander Bokovoy Sr. Principal Software Engineer Security / Identity Management Engineering Red Hat Limited, Finland

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Re: (ITS#8671) Declare ldap_init_fd() in ldap.h to help external consumers
by ondra＠mistotebe.net 14 Jun '19

14 Jun '19

On Thu, Oct 19, 2017 at 03:39:24PM +0000, quanah(a)symas.com wrote: > --On Thursday, October 19, 2017 10:20 AM +0300 Alexander Bokovoy > <abokovoy(a)redhat.com> wrote: >> Hi Quanah, >> >> On ti, 12 syys 2017, Quanah Gibson-Mount wrote: >>> Hi Alexander, >>> >>> Your submission appears to be missing an IPR statement as noted at >>> <https://www.openldap.org/devel/contributing.html#notice>. This is >>> required for your submission to be evaluated. Please add an IPR at >>> your earliest convenience. >> Attached is a re-based patch set since there were changes in git master >> in last month or so that affected the same area. >> >> There are two patches: one for git master, one for 2.4 branch. Since >> there is no functional change in the code, I'd like to see the 2.4 >> version in an upcoming release as that would greatly help Samba. >> >> I'm also including an IPR notice below: >> >> Red Hat, Inc. hereby place the following modifications to OpenLDAP >> Software (and only these modifications) into the public domain. >> Hence, these modifications may be freely used and/or redistributed >> for any purpose with or without attribution and/or other notice. > > Thanks very much! I'll get this into my scratch repo for review. Hi Alexander, as of commit 6a5e30674b63b17587738ba9a3d1ea3633c33fb1, OpenLDAP master now ships and installs a new header <openldap.h> that should expose ldap_init_fd(). Could you check this will work for Samba before we apply this change in 2.4? Thanks, -- Ondřej Kuzník Senior Software Engineer Symas Corporation http://www.symas.com Packaged, certified, and supported LDAP solutions powered by OpenLDAP

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Re: (ITS#9020) Inconsistent cn=config objectClasses for overlays
by ondra＠mistotebe.net 14 Jun '19

14 Jun '19

On Thu, May 09, 2019 at 04:21:56PM +0000, quanah(a)openldap.org wrote: > The majority of supported overlays use an objectClass of the format: > > olcOVERLAYConfig > > However, there are two overlays that do *not* follow this format, which is > confusing. > > memberOf -> olcMemberOf > dynlist -> olcDynamicList > > For 2.5, I would suggest we change these to be consistent with all the other > overlays and document this change in the Admin Guide section on upgrade notes > etc. Maybe we could change the name in 2.4 with the proposed names as the primary keeping the old one as an alternative? Don't remember if slapcat would translate them accordingly. If it does, we could just drop the old name in 2.5 (and have everyone slapcat cn=config with OpenLDAP >= 2.4.48 or wherever this lands). Or just do the above in 2.5 only. -- Ondřej Kuzník Senior Software Engineer Symas Corporation http://www.symas.com Packaged, certified, and supported LDAP solutions powered by OpenLDAP

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Re: (ITS#8754) ldpasearch IPv5 only
by ondra＠mistotebe.net 14 Jun '19

14 Jun '19

On Wed, Oct 11, 2017 at 12:24:56PM +0000, dpa-openldap(a)aegee.org wrote: > After `./configure --disable-ipv6` I expect, that `ldapsearch` will not contact > severs over IPv6, which is achieved with the fix below. Hi, thank you for your work, the patch has been pushed to master (5e8aa3f6d111160cbb3ce3a49af7323258e702b5) and will also be part (c4f55cea87880ca8c14b559bd77bcea19ad615cd) of the upcoming 2.4.48 release. Thanks, -- Ondřej Kuzník Senior Software Engineer Symas Corporation http://www.symas.com Packaged, certified, and supported LDAP solutions powered by OpenLDAP

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Re: (ITS#8427) Incorrect value of tls_reqcert in syncrepl
by ondra＠mistotebe.net 14 Jun '19

14 Jun '19

On Fri, Dec 01, 2017 at 07:15:08PM +0000, mkp37215(a)gmail.com wrote: > I, Maciej Puzio, hereby place the above modifications to OpenLDAP > Software (and only these modifications) into the public domain. Hence, > these modifications may be freely used and/or redistributed for any > purpose with or without attribution and/or other notice. Hi Maciej, thank you for your work, patches have been pushed to master and will also be part of the upcoming 2.4.48 release. Thanks, -- Ondřej Kuzník Senior Software Engineer Symas Corporation http://www.symas.com Packaged, certified, and supported LDAP solutions powered by OpenLDAP

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Re: (ITS#8674) Leak in ldap_create_assertion_control
by ondra＠mistotebe.net 14 Jun '19

14 Jun '19

On Thu, Sep 07, 2017 at 03:42:50PM +0000, come(a)opensides.be wrote: > Hello, > > I encountered this bug as well while adding controls support into > php-ldap (see https://github.com/php/php-src/pull/2640 - WIP) > I used the work-around but it would still be better to fix this in > openldap. Hi Côme, thank you for your work, your patch has been pushed to master (2cac3ceb03530e3afe741d4a7d4d7e21059a6a97) and will also be part (8e6d1b8b81e94f89027a120ea862bd5938e953c6) of the upcoming 2.4.48 release. Thanks, -- Ondřej Kuzník Senior Software Engineer Symas Corporation http://www.symas.com Packaged, certified, and supported LDAP solutions powered by OpenLDAP

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Re: (ITS#8167) The new non-blocking TLS connect does not work in a reference/referral
by ondra＠mistotebe.net 14 Jun '19

14 Jun '19

On Wed, Jun 10, 2015 at 12:39:19AM +0000, ipuleston(a)SonicWALL.com wrote: > I've now uploaded the patch to the ftp.openldap.org FTP server as "ian-pule= > ston-15069.patch". Hi Ian, thank you for your work, the patch has been pushed to master (46c93e41f43da7f16270179c6eff75e450617329) and will also be part (a8cf2fb10047794c83873f5ff5c125ecd0e53168) of the upcoming 2.4.48 release. Thanks, -- Ondřej Kuzník Senior Software Engineer Symas Corporation http://www.symas.com Packaged, certified, and supported LDAP solutions powered by OpenLDAP

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Re: (ITS#8450) race condition in ldap_int_utils_init
by ondra＠mistotebe.net 14 Jun '19

14 Jun '19

On Fri, Jun 24, 2016 at 08:04:27PM +0000, doug.leavitt(a)oracle.com wrote: > There is a race condition in ldap_int_utils_init that can be triggered when > multiple threads enter ldap_int_utils_init from ldap_init_initialize about the > same time. The done flag gets set immediately, before the various mutexes are > initialized. If thread A sets done, and thread B tests for done==1 before thread > A has completed the mutex inits, thread B can attempt to use an uninitialized > mutex and fail/core dump etc. > > Additionally if judt the done=1 is moved to the bottom of the function thwo > threads can both be initializing the same mutexes multiple times causes other > mayhem. > > The short term workaround for Solaris (THR APIs) is to move setting of done=1 to > after the mutex inits, and to protect the mutex inits using another statically > initialized mutex within ldap_int_utils_init. Hi Doug, a patch addressing this and ITS#7996 has been pushed to master (db40120a276c3b7968552e253aea24860fad5f60) and will also be part (cde56fad154fcd25e351c3cd84d8173d263b0a01) of the upcoming 2.4.48 release. Thanks, -- Ondřej Kuzník Senior Software Engineer Symas Corporation http://www.symas.com Packaged, certified, and supported LDAP solutions powered by OpenLDAP

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Re: (ITS#7996) Global initialisation race in ldap_int_initialize
by ondra＠mistotebe.net 14 Jun '19

14 Jun '19

On Fri, Sep 08, 2017 at 02:07:19PM +0000, quanah(a)symas.com wrote: > --On Friday, September 08, 2017 1:02 PM +0000 a.cudbardb(a)freeradius.org > wrote: >>> Thanks for the report and sorry for the delay on getting to this >>> issue. I would note that for the fix to be included in the OpenLDAP >>> project, we need an IPR statement, as noted at >>> <https://www.openldap.org/devel/contributing.html>. If you can >>> provide that, and (if possible) submit the patch as git format-patch >>> via the project FTP server (include the URL in your email), then I >>> can pull it in. >> >> IPR statement is not a problem, but I don't have the original diff to = >> work from. If you can send me a copy of the FTP submission I can = >> reformat it and resubmit it. > > Hi Arran, > > The diff is in your github issues tracker. ;) > > <https://github.com/arr2036/ldapperf/issues/2#issuecomment-66242732> Hi Arran, thank you for your work, a patch addressing this has been pushed to master (db40120a276c3b7968552e253aea24860fad5f60) and will also be part (cde56fad154fcd25e351c3cd84d8173d263b0a01) of the upcoming 2.4.48 release. Thanks, -- Ondřej Kuzník Senior Software Engineer Symas Corporation http://www.symas.com Packaged, certified, and supported LDAP solutions powered by OpenLDAP

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Re: (ITS#7042) [PATCH] allow unsetting of tls_* options for syncrepl
by ondra＠mistotebe.net 14 Jun '19

14 Jun '19

On Sat, Oct 21, 2017 at 03:50:48PM +0000, patrick(a)monnerat.net wrote: > Hi Quanah, > Thanks for your directives and future action. Hi Patrick, thank you for your patch, it has now been pushed to master (0f9afae02d9425e54f070ecd5ea8b954115e092b) and will also be part (e5f945bab40482e2045fede3fbe9a04210808a93) of the upcoming 2.4.48 release. Thanks, -- Ondřej Kuzník Senior Software Engineer Symas Corporation http://www.symas.com Packaged, certified, and supported LDAP solutions powered by OpenLDAP

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Re: (ITS#9034) LDMB: 0.9.22/3: initial mdb_env_set_mapsize() is problematic
by hyc＠symas.com 14 Jun '19

14 Jun '19

steffen(a)sdaoden.eu wrote: > Full_Name: Steffen Nurpmeso > Version: 0.9.23 > OS: Linux > URL: https://ftp.sdaoden.eu/lmdb-bogo.tar.xz > Submission from: (NULL) (109.40.130.211) > > > A follow-up to private communication with Quanah Gibson-Mount. > You can find more in the tarball linked below. The code works as designed. No changes to mapsize handling were made between 0.9.22 and 0.9.23. Closing this ITS. -- -- Howard Chu CTO, Symas Corp. http://www.symas.com Director, Highland Sun http://highlandsun.com/hyc/ Chief Architect, OpenLDAP http://www.openldap.org/project/

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Re: (ITS#9036) LDMB: 0.9.23: mdb_env_info() does not report latest mapsize() after transaction abort
by hyc＠symas.com 14 Jun '19

14 Jun '19

steffen(a)sdaoden.eu wrote: > Full_Name: Steffen Nurpmeso > Version: 0.9.23 > OS: Linux > URL: https://ftp.sdaoden.eu/lmdb-bogo.tar.xz > Submission from: (NULL) (109.40.130.211) > > > A follow-up to private communication with Quanah Gibson-Mount. > You can find more in the tarball linked below > > Your README states that the behavior in LMDB 0.9.23 is different than in 0.9.22 but that is incorrect. No changes to set_mapsize() behavior were made between 0.9.22 and 0.9.23. Closing this ITS. -- -- Howard Chu CTO, Symas Corp. http://www.symas.com Director, Highland Sun http://highlandsun.com/hyc/ Chief Architect, OpenLDAP http://www.openldap.org/project/

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Re: (ITS#9035) LDMB: 0.9.23: mdb_env_set_maxreaders() not honoured?
by hyc＠symas.com 14 Jun '19

14 Jun '19

steffen(a)sdaoden.eu wrote: > Full_Name: Steffen Nurpmeso > Version: 0.9.23 > OS: Linux > URL: https://ftp.sdaoden.eu/lmdb-bogo.tar.xz > Submission from: (NULL) (109.40.130.211) > > > A follow-up to private communication with Quanah Gibson-Mount. > You can find more in the tarball linked below The maxreaders setting doesn't persist after all processes have closed the environment. Therefore it returns to its default value when the next process opens the environment. The code works as designed. There is no bug here. Closing this ITS. -- -- Howard Chu CTO, Symas Corp. http://www.symas.com Director, Highland Sun http://highlandsun.com/hyc/ Chief Architect, OpenLDAP http://www.openldap.org/project/

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(ITS#9036) LDMB: 0.9.23: mdb_env_info() does not report latest mapsize() after transaction abort
by steffen＠sdaoden.eu 14 Jun '19

14 Jun '19

Full_Name: Steffen Nurpmeso Version: 0.9.23 OS: Linux URL: https://ftp.sdaoden.eu/lmdb-bogo.tar.xz Submission from: (NULL) (109.40.130.211) A follow-up to private communication with Quanah Gibson-Mount. You can find more in the tarball linked below

1 0

(ITS#9035) LDMB: 0.9.23: mdb_env_set_maxreaders() not honoured?
by steffen＠sdaoden.eu 14 Jun '19

14 Jun '19

Full_Name: Steffen Nurpmeso Version: 0.9.23 OS: Linux URL: https://ftp.sdaoden.eu/lmdb-bogo.tar.xz Submission from: (NULL) (109.40.130.211) A follow-up to private communication with Quanah Gibson-Mount. You can find more in the tarball linked below

1 0

(ITS#9034) LDMB: 0.9.22/3: initial mdb_env_set_mapsize() is problematic
by steffen＠sdaoden.eu 14 Jun '19

14 Jun '19

Full_Name: Steffen Nurpmeso Version: 0.9.23 OS: Linux URL: https://ftp.sdaoden.eu/lmdb-bogo.tar.xz Submission from: (NULL) (109.40.130.211) A follow-up to private communication with Quanah Gibson-Mount. You can find more in the tarball linked below.

1 0

Re: (ITS#9033) Computer Object
by quanah＠symas.com 13 Jun '19

13 Jun '19

--On Thursday, June 13, 2019 12:43 PM +0000 jgbuenaventura(a)gmail.com wrote: > Hi, > > I am trying to add a computer/network device (windows, linux, routers) in > Openldap, but i cannot find a specific, schema/objectclass/attribute for > that. Any advice? Hello, The ITS system is for reporting bugs, not asking usage questions. Please use the openldap-technical(a)openldap.org mailing lists for questions such as those above (<https://www.openldap.org/lists/mm/listinfo/openldap-technical>). --Quanah -- Quanah Gibson-Mount Product Architect Symas Corporation Packaged, certified, and supported LDAP solutions powered by OpenLDAP: <http://www.symas.com>

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(ITS#9033) Computer Object
by jgbuenaventura＠gmail.com 13 Jun '19

13 Jun '19

Full_Name: JP Buenaventura Version: 2.4.45 OS: Rhel 6 URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (222.127.115.105) Hi, I am trying to add a computer/network device (windows, linux, routers) in Openldap, but i cannot find a specific, schema/objectclass/attribute for that. Any advice? Thanks! JP

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Re: (ITS#9032) need to create custom attributes in openldap schema
by ryan＠nardis.ca 09 Jun '19

09 Jun '19

Hello Suresh, The ITS is for reporting bugs, not for usage questions. For support, please write to the openldap-technical(a)openldap.org mailing list. See https://www.openldap.org/support/ for more details. This ITS will be closed. Thank you, Ryan.

1 0

(ITS#9032) need to create custom attributes in openldap schema
by sureshd＠nihontechnology.com 08 Jun '19

08 Jun '19

Full_Name: Suresh Dhayalan Version: 1.2.2 OS: ubuntu 18.6 URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (164.164.10.1) Dear sir, I need to create custom schema attributes, in my AWS cloud I am using ubuntu 18.6. I will create additional attributes to my project related apart from in build attributes, so kindly send me the steps to create my custom attributes. Regards, D Suresh

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