openldap-bugs May 2013

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30 participants
83 discussions

(ITS#7594) incomplete MDB subdb cursor cleanup
by h.b.furuseth＠usit.uio.no 18 May '13

18 May '13

Full_Name: Hallvard B Furuseth Version: mdb.master 0cdd9dffddf66c730a35f48db2bb02d8bb3e5731 OS: Linux x86_64 URL: Submission from: (NULL) (193.69.163.163) Submitted by: hallvard If a cursor is at a clean subDB page, and its current item is deleted by another cursor, then MDB_GET_CURRENT returns the deleted item. Test program below, run with no args, the "m2/del" output line. If the page was dirty, I instead got (key = old, data = size 0). I don't know if it should give MDB_NOTFOUND instead. That's the test program run with one arg. I did not check what happens if the other cursor rearranged the pages, e.g. split the item off to another page. #include "lmdb.h" #include <assert.h> #include <stdio.h> #include <stdlib.h> int main(int argc, char **argv) { char *fname = "test.mdb"; MDB_env *env; MDB_txn *txn; MDB_dbi dbi; MDB_cursor *mc, *m2; MDB_val key, data; int rc; # define STR2VAL(s) (&(MDB_val){sizeof(s), s}) /* includes final \0 */ # define SHOW(name) printf("%s:\t%s[%zd] -> %s[%zd]\n", name, \ (char*)key.mv_data, key.mv_size, (char*)data.mv_data, data.mv_size) # define E(e) { rc = (e); if (rc) { fprintf(stderr, "%s:%d: %s: %s\n",\ __FILE__, __LINE__, #e, mdb_strerror(rc)); abort(); } } remove(fname); E(mdb_env_create(&env)); E(mdb_env_open(env, fname, MDB_NOSUBDIR, 0666)); E(mdb_txn_begin(env, NULL, 0, &txn)); E(mdb_dbi_open(txn, NULL, MDB_DUPSORT, &dbi)); E(mdb_cursor_open(txn, dbi, &mc)); E(mdb_cursor_put(mc, STR2VAL("a"), STR2VAL("x"), 0)); E(mdb_cursor_put(mc, STR2VAL("a"), STR2VAL("y"), 0)); if (argc < 2) { E(mdb_txn_commit(txn)); E(mdb_txn_begin(env, NULL, 0, &txn)); E(mdb_cursor_open(txn, dbi, &mc)); puts("With clean page:"); } E(mdb_cursor_open(txn, dbi, &m2)); E(mdb_cursor_get(mc, &key, &data, MDB_FIRST)); E(mdb_cursor_get(m2, &key, &data, MDB_FIRST)); SHOW("Name:\tKey -> Data (mv_data[mv_len]):\n" "m2"); E(mdb_cursor_del(mc, 0)); E(mdb_cursor_get(m2, &key, &data, MDB_GET_CURRENT)); SHOW("m2/del"); /* Should output the same as... */ E(mdb_cursor_get(mc, &key, &data, MDB_GET_CURRENT)); SHOW("mc/del"); /* ...this: "a[2] -> [0]". */ mdb_txn_abort(txn); mdb_env_close(env); return 0; }

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Re: (ITS#7589) MDB nodesize issues
by h.b.furuseth＠usit.uio.no 17 May '13

17 May '13

Another issue: This breaks because liblmdb does not change the node size when overwriting an overflow page: mdb_put(txn, dbi, &key, &(MDB_val){9000, val}, 0); mdb_put(txn, dbi, &key, &(MDB_val){1, val}, 0); mdb_get(txn, dbi, &key, &data); assert(data.mv_size != 9000); Fixed by 0cdd9dffddf66c730a35f48db2bb02d8bb3e5731. mdb_cursor_put() said: /* yes, overwrite it. Note in this case we don't * bother to try shrinking the node if the new data * is smaller than the overflow threshold. */ It's number of pages which does not need to shrink. -- Hallvard

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Re: (ITS#7577) hdb and mdb derefere aliases differently
by hyc＠symas.com 17 May '13

17 May '13

Juergen.Sprenger(a)swisscom.com wrote: > tried the fix fb537d747c6fd43e08986e99b1fe7781660feaf3 There was a followup commit also needed. 201ddbe3e4d8eb39830b96eefa559900952bc022 Just get the latest. -- -- 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#7577) hdb and mdb derefere aliases differently
by Juergen.Sprenger＠swisscom.com 17 May '13

17 May '13

tried the fix fb537d747c6fd43e08986e99b1fe7781660feaf3 but behavior did not change. Juergen Sprenger

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(ITS#7593) Openldap - MySQL | Issue with displaying list of users from same domain
by sandeeps＠rediff-inc.com 15 May '13

15 May '13

Full_Name: Sandeep Singh Version: openldap-2.4.35 OS: CentOS Linux release 6.0 URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (202.137.232.113) Hello, We have configured an openldap server with mysql as the backend. It is working fine as well. We have a scenario where we feel it is not behaving the way it is required. We have multiple domains say:- 1) abc.com 2) xyz.com Have mapped user as:- 1) mail=man1(a)red.com,dc=abc,dc=com with password=man1r 2) mail=man2(a)red.com,dc=abc,dc=com with password=man2r 3) mail=man1(a)sad.com,dc=xyz,dc=com with password=man1s 4) mail=man2(a)sad.com,dc=xyz,dc=com with password=man2s When we search for result using:- ldapsearch -x -D "mail=man1(a)red.com,dc=abc,dc=com" -W -b "dc=abc,dc=com" It gives us output / result shown is of domains abc.com i.e. mail=man1(a)red.com,dc=abc,dc=com & mail=man1@red.com,dc=abc,dc=com Which is correct But when we search for results using:- ldapsearch -x -D "mail=man1(a)red.com,dc=abc,dc=com" -W -b "dc=xyz,dc=com" Then the output / result shown is of domain xyz.com i.e. mail=man1(a)sad.com,dc=xyz,dc=com & mail=man2@sad.com,dc=xyz,dc=com because the base search is dc=xyz,dc=com Which is not correct as mail=man1(a)red.com,dc=abc,dc=com does not belong to xyz.com domain So we want to authenticate and display user along with the list of other users from the same domain and not from the other domain. Please suggest how to overcome / solve the issue.

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Re: (ITS#7591) back-meta modify operation not sending result to client
by jorge.perez.burgos＠ericsson.com 14 May '13

14 May '13

kludge fix for the problem --- servers/slapd/back-meta/modify.c 2012-07-31 18:39:26.000000000 +0200 +++ servers/slapd/back-meta/modify.c 2013-05-14 12:45:39.273333000 +0200 @@ -176,6 +176,7 @@ } modv[ i ] = 0; + rs->sr_type = -1; retry:; ctrls = op->o_ctrls; rc = meta_back_controls_add( op, rs, mc, candidate, &ctrls ); @@ -198,6 +200,10 @@ } cleanup:; + if (rs->sr_type != REP_RESULT) { + send_ldap_error(op, rs, LDAP_OTHER, "connection problem trying to reach the other node"); + } + (void)mi->mi_ldap_extra->controls_free( op, rs, &ctrls ); if ( mdn.bv_val != op->o_req_dn.bv_val ) {

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(ITS#7592) LMDB corruption
by hyc＠OpenLDAP.org 14 May '13

14 May '13

Full_Name: Howard Chu Version: 2.4.33+ OS: URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (78.155.233.73) Submitted by: hyc Already fixed in mdb.master commit 7233bc295bb3e40b2758158ae2de6f42516962f8 In mdb_page_split, if updating the parent's separator triggers a split in the parent, and the current cursor position happens to point to the split index, the cursor will be left pointing to the old parent page instead of the correct page.

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(ITS#7591) back-meta modify operation not sending result to client
by jorge.perez.burgos＠ericsson.com 14 May '13

14 May '13

Full_Name: Jorge Perez Burgos Version: 2.4.32 OS: SLES 10 URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (195.235.15.243) Right now when sending bulk traffic trough back-meta and killing the slapds receiving the proxy traffic, it can be seen that a very few modify operations are not receiving the result of the operations, looking at the code it seems the same for the add and delete operation. Basically when ldap_modify_ext returns an errno it seems that is not properly handle afterwards.

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Re: (ITS#7589) MDB nodesize issues
by h.b.furuseth＠usit.uio.no 13 May '13

13 May '13

I wrote: > OTOH if you add a bunch of slightly smaller nodes, mdb will put > most of them in separate pages anyway without MDB_APPEND. ...because mdb_page_split() has been wasteful since 48ef27b6f5c804eca6a9 "ITS#7385 fix mdb_page_split (again)". When a txn put()s ascending keys with nodes of the same size, the new item goes in the fullest page. E.g. put data size 1010 with 'int' keys 1,2,3... to an MDB_INTEGERKEY DB. As the txn progresses, (page: #key #key...) get distributed thus: Page 2: #1. Page 2: #1 #2. Page 2: #1 #2 #3. Page 2: #1. Page 3: #2 #3 #4. Page 2: #1. Page 3: #2. Page 5: #3 #4 #5. Page 2: #1. Page 3: #2. Page 5: #3. Page 6: #4 #5 #6. 2/3 wasted space. Descending put() work better: Page 2: #6. Page 2: #5 #6. Page 2: #4 #5 #6. Page 2: #3 #4. Page 3: #5 #6. Page 2: #2 #3 #4. Page 3: #5 #6. Page 2: #2 #1. Page 3: #5 #6. Page 5: #3 #4. Ascending put() with datasize 1348, so only 2 nodes fit in a page: Page 2: #1. Page 2: #1 #2. Page 2: #1. Page 3: #2 #3. Page 2: #1. Page 3: #2. Page 5: #3 #4. Half of the space is wasted. Descending order does not help. page_split() cannot know which split is best in this case. But it'll help to guess that the next put() key sometimes will be near this one, and ensure that the node with the new key will be the smallest. That will also avoid touching the old page when the nodes are that large, since the "split" will keep all old nodes in the old page. Trying a simpler patch for this one: > Nodes of size MDB_env.me_nodemax-1 do not go in overflow pages, > but are too big for two of them to fit in the same page. (...) Let mdb_env_open2() round me_nodemax down to an odd number: env->me_nodemax = (((env->me_psize - PAGEHDRSZ) / MDB_MINKEYS) - 1) | 1; Then a leaf page with just 1 node can always get another one, since mdb_node_add() will always put too big items in overflow pages. In a DB newer than this patch, anyway... Maybe mdb_cursor_put() should use the value from before 'offset += offset & 1;' in next line's compare with me_nodemax: @@ -5128,5 +5128,6 @@ } + i = offset; offset += offset & 1; if (NODESIZE + sizeof(indx_t) + NODEKSZ(leaf) + NODEDSZ(leaf) + - offset >= mc->mc_txn->mt_env->me_nodemax) { + i >= mc->mc_txn->mt_env->me_nodemax) { /* yes, convert it */ This passes 'make test', with or without changing cursor_put(). But I still don't quite know what I'm doing - otherwise my LEAFSIZE patch would have worked too. -- Hallvard

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(ITS#7590) admin24 incorrectly says "back-bdb" is recommended
by quanah＠OpenLDAP.org 13 May '13

13 May '13

Full_Name: Quanah Gibson-Mount Version: 2.4.35 OS: linux 2.6 URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (75.111.58.125) H3: Overview The {{bdb}} backend to {{slapd}}(8) is the recommended primary backend for a normal {{slapd}} database. Which stopped being true with OpenLDAP 2.3 IIRC, which is when back-hdb was made the recommended backend.

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openldap-bugs May 2013