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Re: (ITS#6798) Mutex starvation on two-level referral for SASL connection
by hyc＠symas.com 20 Jan '11

20 Jan '11

hyc(a)symas.com wrote: > timo.aaltonen(a)aalto.fi wrote: >> Hi >> >> Here's some information that Stephen asked would be of use. There is >> one forest, one domain, but three sites in the layout. The functional >> level of the forest and the domain is W2008, but the servers have 2008R2. >> >> And the full backtrace of the hung process: > >> #3 0x00007f8f652f3bcb in ldap_pvt_thread_mutex_lock >> (mutex=0x7f8f6553fc80) >> at /tmp/buildd/openldap-2.4.23/libraries/libldap_r/thr_posix.c:296 >> No locals. >> #4 0x00007f8f653010bf in ldap_sasl_interactive_bind_s (ld=0x2117c20, >> dn=0x0, >> mechs=0x210d530 "GSSAPI", serverControls=0x0, clientControls=0x0, >> flags=2, >> interact=0x7f8f61405120<sdap_sasl_interact>, defaults=0x2124a50) at >> sasl.c:426 >> rc = -1921681294 >> smechs = 0x0 > > This particular mutex seems kind of bogus to me; the code is from rev 1.31 in > June 2001. Perhaps back then it was unsafe to have multiple SASL operations > outstanding at once; I would expect that was only an issue in the Cyrus 1.5 > days and it should be safe now with Cyrus 2.x. We should probably just delete > this mutex. > Although googling for "Cyrus sasl reentrancy" does not leave me with warm/fuzzy feelings. -- -- 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#6798) Mutex starvation on two-level referral for SASL connection
by hyc＠symas.com 20 Jan '11

20 Jan '11

timo.aaltonen(a)aalto.fi wrote: > Hi > > Here's some information that Stephen asked would be of use. There is > one forest, one domain, but three sites in the layout. The functional > level of the forest and the domain is W2008, but the servers have 2008R2. > > And the full backtrace of the hung process: > #3 0x00007f8f652f3bcb in ldap_pvt_thread_mutex_lock > (mutex=0x7f8f6553fc80) > at /tmp/buildd/openldap-2.4.23/libraries/libldap_r/thr_posix.c:296 > No locals. > #4 0x00007f8f653010bf in ldap_sasl_interactive_bind_s (ld=0x2117c20, > dn=0x0, > mechs=0x210d530 "GSSAPI", serverControls=0x0, clientControls=0x0, > flags=2, > interact=0x7f8f61405120<sdap_sasl_interact>, defaults=0x2124a50) at > sasl.c:426 > rc = -1921681294 > smechs = 0x0 This particular mutex seems kind of bogus to me; the code is from rev 1.31 in June 2001. Perhaps back then it was unsafe to have multiple SASL operations outstanding at once; I would expect that was only an issue in the Cyrus 1.5 days and it should be safe now with Cyrus 2.x. We should probably just delete this mutex. -- -- 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#6798) Mutex starvation on two-level referral for SASL connection
by timo.aaltonen＠aalto.fi 20 Jan '11

20 Jan '11

On Thu, 20 Jan 2011, Howard Chu wrote: > timo.aaltonen(a)aalto.fi wrote: >> Hi >> >> Here's some information that Stephen asked would be of use. There is >> one forest, one domain, but three sites in the layout. The functional >> level of the forest and the domain is W2008, but the servers have 2008R2. >> >> And the full backtrace of the hung process: > > Thanks, but this trace is from 2.4.21, which is obsolete. Please use the > current release (2.4.23) since the relevant code has changed. There is no > point in us spending time tracking down issues in non-existent code. Not true, I backported 2.4.23 from natty, and made it build in lucid pbuilder. nexus6 sssd # apt-cache policy libldap-2.4-2 libldap-2.4-2: Installed: 2.4.23-6ubuntu4aalto1 Candidate: 2.4.23-6ubuntu4aalto1 Version table: *** 2.4.23-6ubuntu4aalto1 0 100 /var/lib/dpkg/status 2.4.21-0ubuntu5.3 0 500 http://ubuntu.hut.fi/ubuntu/ lucid-updates/main Packages 2.4.21-0ubuntu5.2 0 500 http://ubuntu.hut.fi/ubuntu/ lucid-security/main Packages 2.4.21-0ubuntu5 0 500 http://ubuntu.hut.fi/ubuntu/ lucid/main Packages I believe there is no reason to rebuild sssd against that, since they are ABI compatible? -- Timo Aaltonen Systems Specialist, Aalto IT

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Re: (ITS#6798) Mutex starvation on two-level referral for SASL connection
by hyc＠symas.com 20 Jan '11

20 Jan '11

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Re: (ITS#6798) Mutex starvation on two-level referral for SASL connection
by hyc＠symas.com 20 Jan '11

20 Jan '11

1 0

Re: (ITS#6798) Mutex starvation on two-level referral for SASL connection
by timo.aaltonen＠aalto.fi 20 Jan '11

20 Jan '11

Hi Here's some information that Stephen asked would be of use. There is one forest, one domain, but three sites in the layout. The functional level of the forest and the domain is W2008, but the servers have 2008R2. And the full backtrace of the hung process: #0 __lll_lock_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:136 No locals. #1 0x00007f8f63ec05d9 in _L_lock_953 () from /lib/libpthread.so.0 No symbol table info available. #2 0x00007f8f63ec03fb in __pthread_mutex_lock (mutex=0x7f8f6553fc80) at pthread_mutex_lock.c:61 ignore1 = <value optimized out> ignore2 = 1700002944 ignore3 = -512 __PRETTY_FUNCTION__ = "__pthread_mutex_lock" type = <value optimized out> #3 0x00007f8f652f3bcb in ldap_pvt_thread_mutex_lock (mutex=0x7f8f6553fc80) at /tmp/buildd/openldap-2.4.23/libraries/libldap_r/thr_posix.c:296 No locals. #4 0x00007f8f653010bf in ldap_sasl_interactive_bind_s (ld=0x2117c20, dn=0x0, mechs=0x210d530 "GSSAPI", serverControls=0x0, clientControls=0x0, flags=2, interact=0x7f8f61405120 <sdap_sasl_interact>, defaults=0x2124a50) at sasl.c:426 rc = -1921681294 smechs = 0x0 #5 0x00007f8f6140888d in sdap_rebind_proc (ldap=0x2117c20, url=0x2125a00 "ldap://DomainDnsZones.domain.com/DC=DomainDnsZones,DC=domain,DC=com", request=<value optimized out>, msgid=<value optimized out>, params=<value optimized out>) at src/providers/ldap/sdap_async_connection.c:1637 p = <value optimized out> sasl_mech = <value optimized out> user_dn = <value optimized out> password = {bv_len = 0, bv_val = 0x0} ctrls = {0x0, 0x0} tmp_ctx = <value optimized out> ret = <value optimized out> __FUNCTION__ = "sdap_rebind_proc" #6 0x00007f8f65310a46 in ldap_new_connection (ld=0x2117c20, srvlist=0x7fffdebf22f8, use_ldsb=0, connect=1, bind=0x7fffdebf22b0) at request.c:518 srvfunc = 0x2122da0 err = 0 savedefconn = 0x21208d0 lc = 0x21227c0 async = 0 __PRETTY_FUNCTION__ = "ldap_new_connection" #7 0x00007f8f6530fdf0 in ldap_send_server_request (ld=0x2117c20, ber=0x2122760, msgid=8, parentreq=0x21304f0, srvlist=0x7fffdebf22f8, lc=0x0, bind=0x7fffdebf22b0) at request.c:211 lr = 0x63 incparent = 1 rc = 1697594315 #8 0x00007f8f653125dc in ldap_chase_v3referrals (ld=0x2117c20, lr=0x21304f0, refs=0x0, sref=1, errstrp=0x2130520, hadrefp=0x7fffdebf24f8) at request.c:1211 unfollowed = 0x0 unfollowedcnt = 0 origreq = 0x21304f0 srv = 0x2125a60 ber = 0x2122760 refarray = 0x2122720 lc = 0x0 rc = 0 count = 0 i = 0 j = 0 id = 8 rinfo = {ri_msgid = 5, ri_request = 99, ri_url = 0x2125a00 "ldap://DomainDnsZones.domain.com/DC=DomainDnsZones,DC=domain,DC=com"} #9 0x00007f8f652f6165 in try_read1msg (ld=0x2117c20, msgid=7, all=1, lc=0x2117760, result=0x7fffdebf26b0) at result.c:708 refs = 0x2122720 ber = 0x212e910 newmsg = 0x2117c20 l = 0x2124140 prev = 0x7debf25e0 id = 5 idx = 0 tag = 115 len = 76 foundit = 0 lr = 0x21304f0 tmplr = 0x7f8f6531039d dummy_lr = {lr_msgid = 0, lr_status = 0, lr_refcnt = 0, lr_outrefcnt = 0, lr_abandoned = 0, lr_origid = 0, lr_parentcnt = 0, lr_res_msgtype = 0, lr_res_errno = 0, lr_res_error = 0x0, lr_res_matched = 0x0, lr_ber = 0x0, lr_conn = 0x0, lr_dn = {bv_len = 0, bv_val = 0x0}, lr_parent = 0x0, lr_child = 0x0, lr_refnext = 0x0, lr_prev = 0x0, lr_next = 0x0} tmpber = {ber_opts = {lbo_valid = 2, lbo_options = 1, lbo_debug = 0}, ber_tag = 0, ber_len = 85, ber_usertag = 0, ber_buf = 0x2131cd0 "\002\001\005s\204", ber_ptr = 0x2131d25 "", ber_end = 0x2131d25 "", ber_sos_ptr = 0x0, ber_rwptr = 0x0, ber_memctx = 0x0} rc = -2 refer_cnt = 0 hadref = 0 simple_request = 0 err = 1 lderr = 0 tmp = 0x0 chain_head = 0x0 moremsgs = 0 isv2 = 0 __PRETTY_FUNCTION__ = "try_read1msg" #10 0x00007f8f652f571b in wait4msg (ld=0x2117c20, msgid=7, all=1, timeout=0x7fffdebf25b0, result=0x7fffdebf26b0) at result.c:390 lnext = 0x2117760 lc_ready = 1 rc = -2 tv = {tv_sec = 6, tv_usec = 0} tv0 = {tv_sec = 6, tv_usec = 0} start_time_tv = {tv_sec = 1295533580, tv_usec = 63738} tvp = 0x7fffdebf25b0 lc = 0x2117760 __PRETTY_FUNCTION__ = "wait4msg" #11 0x00007f8f652f4ddf in ldap_result (ld=0x2117c20, msgid=7, all=1, timeout=0x0, result=0x7fffdebf26b0) at result.c:120 rc = 1227 __PRETTY_FUNCTION__ = "ldap_result" #12 0x00007f8f65300a06 in ldap_sasl_bind_s (ld=0x2117c20, dn=0x0, mechanism=0x7f8f5ffe894c "GSSAPI", cred=0x7fffdebf2740, sctrls=0x0, cctrls=0x0, servercredp=0x7fffdebf2758) at sasl.c:194 rc = 0 msgid = 7 result = 0x0 scredp = 0x0 #13 0x00007f8f652fce5b in ldap_int_sasl_bind (ld=0x2117c20, dn=0x0, mechs=0x210d530 "GSSAPI", sctrls=0x0, cctrls=0x0, flags=2, interact=0x7f8f61405120 <sdap_sasl_interact>, defaults=0x21170b0) at cyrus.c:535 scred = 0x0 credlen = 32767 data = 0x8d757872de362e00 <Address 0x8d757872de362e00 out of bounds> mech = 0x7f8f5ffe894c "GSSAPI" pmech = 0x7f8f5ffe894c "GSSAPI" saslrc = 1 rc = 0 ssf = 0x0 ctx = 0x2127380 oldctx = 0x0 prompts = 0x0 credlen = 1202 ccred = {bv_len = 1202, bv_val = 0x2125540 "`\202\004\256\006\t*\206H\206\367\022\001\002\002\001"} sd = 23 ssl = 0x0 #14 0x00007f8f6530120f in ldap_sasl_interactive_bind_s (ld=0x2117c20, dn=0x0, mechs=0x210d530 "GSSAPI", serverControls=0x0, clientControls=0x0, flags=2, interact=0x7f8f61405120 <sdap_sasl_interact>, defaults=0x21170b0) at sasl.c:464 rc = -1921681294 smechs = 0x0 #15 0x00007f8f6140888d in sdap_rebind_proc (ldap=0x2117c20, url=0x2126270 "ldap://ForestDnsZones.domain.com/DC=ForestDnsZones,DC=domain,DC=com", request=<value optimized out>, msgid=<value optimized out>, params=<value optimized out>) at src/providers/ldap/sdap_async_connection.c:1637 p = <value optimized out> sasl_mech = <value optimized out> user_dn = <value optimized out> password = {bv_len = 0, bv_val = 0x0} ctrls = {0x0, 0x0} tmp_ctx = <value optimized out> ret = <value optimized out> __FUNCTION__ = "sdap_rebind_proc" #16 0x00007f8f65310a46 in ldap_new_connection (ld=0x2117c20, srvlist=0x7fffdebf2bd8, use_ldsb=0, connect=1, bind=0x7fffdebf2b90) at request.c:518 srvfunc = 0x2122190 err = 0 savedefconn = 0x2117760 lc = 0x21208d0 async = 0 __PRETTY_FUNCTION__ = "ldap_new_connection" #17 0x00007f8f6530fdf0 in ldap_send_server_request (ld=0x2117c20, ber=0x21206e0, msgid=6, parentreq=0x21304f0, srvlist=0x7fffdebf2bd8, lc=0x0, bind=0x7fffdebf2b90) at request.c:211 lr = 0x63 incparent = 1 rc = 1697594315 #18 0x00007f8f653125dc in ldap_chase_v3referrals (ld=0x2117c20, lr=0x21304f0, refs=0x0, sref=1, errstrp=0x2130520, hadrefp=0x7fffdebf2dd8) at request.c:1211 unfollowed = 0x0 unfollowedcnt = 0 origreq = 0x21304f0 srv = 0x2116b40 ber = 0x21206e0 refarray = 0x212b470 lc = 0x0 rc = 0 count = 0 i = 0 j = 0 id = 6 rinfo = {ri_msgid = 5, ri_request = 99, ri_url = 0x2126270 "ldap://ForestDnsZones.domain.com/DC=ForestDnsZones,DC=domain,DC=com"} #19 0x00007f8f652f6165 in try_read1msg (ld=0x2117c20, msgid=-1, all=0, lc=0x2117760, result=0x7fffdebf2f68) at result.c:708 refs = 0x212b470 ber = 0x2122580 newmsg = 0x7f8f674287b8 l = 0x7fffdebf2ef0 prev = 0x7f8f67460cd8 id = 5 idx = 0 tag = 115 len = 76 foundit = 0 lr = 0x21304f0 tmplr = 0x100000000 dummy_lr = {lr_msgid = 0, lr_status = 0, lr_refcnt = 0, lr_outrefcnt = 0, lr_abandoned = 0, lr_origid = 0, lr_parentcnt = 0, lr_res_msgtype = 0, lr_res_errno = 0, lr_res_error = 0x0, lr_res_matched = 0x0, lr_ber = 0x0, lr_conn = 0x0, lr_dn = {bv_len = 0, bv_val = 0x0}, lr_parent = 0x0, lr_child = 0x0, lr_refnext = 0x0, lr_prev = 0x0, lr_next = 0x0} tmpber = {ber_opts = {lbo_valid = 2, lbo_options = 1, lbo_debug = 0}, ber_tag = 0, ber_len = 85, ber_usertag = 0, ber_buf = 0x2125410 "\002\001\005s\204", ber_ptr = 0x2125465 "", ber_end = 0x2125465 "", ber_sos_ptr = 0x0, ber_rwptr = 0x0, ber_memctx = 0x0} rc = -2 refer_cnt = 0 hadref = 0 simple_request = 0 err = 0 lderr = 32655 tmp = 0x0 chain_head = 0x0 moremsgs = 0 isv2 = 0 __PRETTY_FUNCTION__ = "try_read1msg" #20 0x00007f8f652f571b in wait4msg (ld=0x2117c20, msgid=-1, all=0, timeout=0x7fffdebf2f50, result=0x7fffdebf2f68) at result.c:390 lnext = 0x7f8f6742f000 lc_ready = 1 rc = -2 tv = {tv_sec = 0, tv_usec = 0} tv0 = {tv_sec = 0, tv_usec = 0} start_time_tv = {tv_sec = 1295533580, tv_usec = 60251} tvp = 0x7fffdebf2e90 lc = 0x2117760 __PRETTY_FUNCTION__ = "wait4msg" #21 0x00007f8f652f4ddf in ldap_result (ld=0x2117c20, msgid=-1, all=0, timeout=0x7fffdebf2f50, result=0x7fffdebf2f68) at result.c:120 rc = 32655 __PRETTY_FUNCTION__ = "ldap_result" #22 0x00007f8f613f7cb4 in sdap_process_result (ev=0x20f11f0, pvt=<value optimized out>) at src/providers/ldap/sdap_async.c:178 sh = 0x21176f0 no_timeout = {tv_sec = 0, tv_usec = 0} te = <value optimized out> msg = <value optimized out> ret = <value optimized out> __FUNCTION__ = "sdap_process_result" #23 0x00007f8f66e3077e in ?? () from /usr/lib/libtevent.so.0 No symbol table info available. #24 0x00007f8f66e2d9f0 in _tevent_loop_once () from /usr/lib/libtevent.so.0 No symbol table info available. #25 0x00007f8f66e2da5b in ?? () from /usr/lib/libtevent.so.0 No symbol table info available. #26 0x0000000000431e51 in server_loop (main_ctx=0x20f2360) at src/util/server.c:526 No locals. #27 0x000000000040f8bb in main (argc=5, argv=<value optimized out>) at src/providers/data_provider_be.c:1333 opt = <value optimized out> pc = <value optimized out> be_domain = 0x20e8490 "DOMAIN" srv_name = <value optimized out> conf_entry = <value optimized out> main_ctx = 0x20f2360 ret = 0 long_options = {{longName = 0x0, shortName = 0 '\000', argInfo = 4, arg = 0x644d00, val = 0, descrip = 0x436e64 "Help options:", argDescrip = 0x0}, { longName = 0x436e72 "debug-level", shortName = 100 'd', argInfo = 2, arg = 0x644de0, val = 0, descrip = 0x436e43 "Debug level", argDescrip = 0x0}, { longName = 0x436e7e "debug-to-files", shortName = 102 'f', argInfo = 0, arg = 0x644de4, val = 0, descrip = 0x437ad8 "Send the debug output to files instead of stderr", argDescrip = 0x0}, {longName = 0x436e8d "debug-timestamps", shortName = 0 '\000', argInfo = 2, arg = 0x644cc0, val = 0, descrip = 0x436e4f "Add debug timestamps", argDescrip = 0x0}, {longName = 0x438458 "domain", shortName = 0 '\000', argInfo = 1, arg = 0x7fffdebf31d8, val = 0, descrip = 0x437b10 "Domain of the information provider (mandatory)", argDescrip = 0x0}, {longName = 0x0, shortName = 0 '\000', argInfo = 0, arg = 0x0, val = 0, descrip = 0x0, argDescrip = 0x0}} __FUNCTION__ = "main" -- Timo Aaltonen Systems Specialist, Aalto IT

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Re: (ITS#6801) New feature, add subtree-include support in meta backend
by masarati＠aero.polimi.it 20 Jan '11

20 Jan '11

jorge.perez.burgos(a)ericsson.com wrote: > Full_Name: Jorge Perez Burgos > Version: 2.4.21 > OS: linux > URL: ftp://ftp.openldap.org/incoming/ > Submission from: (NULL) (195.235.15.243) > > > I'd suggest to introduce a "subtree-include" directive, mutually exclusive with > "subtree-exclude", with different syntaxes, like: > > "[dn[.<style>]:]<pattern>" > > where <style> can be "subtree" or "regex" (other styles like "exact", > "onelevel", "subordinate" could make sense but would be of limited usefulness); > so, for example > > "dn.subtree:<dn>" ("dn.subtree" implicit for backward compatibility) > "dn.regex:<pattern>" > > The "dn.<style>:" prefix is consistent with other features like ACLs, limits and > so. There's ITS#5877 open about making this uniform across slapd for all > features. > > Multiple patterns could be defined; the first that matches would stop execution. > If configured as "subtree-exclude", a match would qualify the target as > "non-candidate" (current behavior for "subtree-exclude"). If configured as > "subtree-include", a match would qualify the target as "candidate". Jorge and I discussed this off-line; suggestions are welcome, otherwise I'd implement it this way right now with ad-hoc code, and eventually turn it into a generally useful feature that could be reused in ACLs, limits, authz, and in other to-be-defined features. p.

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Re: (ITS#6798) Mutex starvation on two-level referral for SASL connection
by h.b.furuseth＠usit.uio.no 20 Jan '11

20 Jan '11

hyc(a)symas.com writes: > Looks like libldap needs to be changed to actually record the tag of the > outgoing requests. (It ought to do so anyway, and probably should return a > ProtocolError result if it receives a response message whose tag doesn't match > its request type.) Yes. OpenLDAP is too trunsting of incoming PDUs to be valid. ...as an option, if this would be noticeable for a lot of users. Users who Just Want Their Programs To Work without OpenLDAP breaking them, and won't be interested in "finger-pointing" against someone else's servers. -- Hallvard

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(ITS#6801) New feature, add subtree-include support in meta backend
by jorge.perez.burgos＠ericsson.com 20 Jan '11

20 Jan '11

Full_Name: Jorge Perez Burgos Version: 2.4.21 OS: linux URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (195.235.15.243) I'd suggest to introduce a "subtree-include" directive, mutually exclusive with "subtree-exclude", with different syntaxes, like: "[dn[.<style>]:]<pattern>" where <style> can be "subtree" or "regex" (other styles like "exact", "onelevel", "subordinate" could make sense but would be of limited usefulness); so, for example "dn.subtree:<dn>" ("dn.subtree" implicit for backward compatibility) "dn.regex:<pattern>" The "dn.<style>:" prefix is consistent with other features like ACLs, limits and so. There's ITS#5877 open about making this uniform across slapd for all features. Multiple patterns could be defined; the first that matches would stop execution. If configured as "subtree-exclude", a match would qualify the target as "non-candidate" (current behavior for "subtree-exclude"). If configured as "subtree-include", a match would qualify the target as "candidate".

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Re: (ITS#6798) Mutex starvation on two-level referral for SASL connection
by hyc＠symas.com 20 Jan '11

20 Jan '11

sgallagh(a)redhat.com wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On 01/19/2011 11:39 AM, masarati(a)aero.polimi.it wrote: >>> Full_Name: Stephen Gallagher >>> Version: 2.4.21-0ubuntu5.2 >> >> I think this issue report is obsoleted by ITS#6510 (released with OL >> 2.4.22), which prevents binds from returning referrals. Please upgrade >> and re-check. > > Upgraded to 2.4.23 and the same behavior occurs. I note in issue 6510 > that it was suggested that nested mutexes could be used to resolve this. > Perhaps we should revisit that. No. Nested mutexes are non-portable, and as already discussed in #6510, it is incorrect to process referrals returned in response to Bind requests. > As you can see from our backtrace, this is actually occurring during the > processing of ldap_result(). We're handling a rebind as ldap_result > travels through a series of referrals. Most likely your server is not using an actual Bind Response tag in its response message. It would be good if you could run this using a debug build (no optimization, full debug symbols present) and examine the tag that was parsed from the referral result. Looks like libldap needs to be changed to actually record the tag of the outgoing requests. (It ought to do so anyway, and probably should return a ProtocolError result if it receives a response message whose tag doesn't match its request type.) -- -- 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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