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(ITS#6953) pcache deadlocks when refreshing cached queries
by ralf＠OpenLDAP.org 25 May '11

25 May '11

Full_Name: Ralf Haferkamp Version: 2.4.25/HEAD OS: URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (89.166.172.234) Submitted by: ralf Under certain circumstances slapo-pcache causes a deadlock in slapd when refreshing a cached query. The reason seems to be that, slapo-pcache considers the refresh search, issued from the consitency checker task, to be answerable from the local cache database (this only seems to happen when the pcacheAttrset contains the "objectclass" Attribute). slapo-pcache will search the cache db with the response callback pointing to be_modify() (indirectly through refresh_merge()) of the same database. When using bdb/hdb as the cache database this cause the task request a write lock on the cached entry with in one bdb transaction while already holding a read lock (from the internal search) through another TXN. slapd is deadlocked after that. See below for a gdb backtrace taken from that situation. The fix seems to be fairly easy. Just do not lookup the cache db when refreshing a cached query. It doesn't make sense anyway. I'll commit something for that shortly. #0 pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162 #1 0x00007f2b88eaf519 in __db_pthread_mutex_lock (env=0xa5ebb0, mutex=<value optimized out>) at ../mutex/mut_pthread.c:318 #2 0x00007f2b88f4252e in __lock_get_internal (lt=0xa5efc0, sh_locker=<value optimized out>, flags=0, obj=0x14060, lock_mode=<value optimized out>, timeout=2169475480, lock=0x7f2b814f93a8) at ../lock/lock.c:953 #3 0x00007f2b88f4350c in __lock_vec (env=0xa5ebb0, sh_locker=0x7f2b858acf38, flags=0, list=0x7f2b814f9360, nlist=2, elistp=0x0) at ../lock/lock.c:136 #4 0x00007f2b88f43c48 in __lock_vec_api (dbenv=<value optimized out>, lid=2147483672, flags=0, list=0x7f2b814f9360, nlist=2, elistp=0x0) at ../lock/lock.c:84 #5 __lock_vec_pp (dbenv=<value optimized out>, lid=2147483672, flags=0, list=0x7f2b814f9360, nlist=2, elistp=0x0) at ../lock/lock.c:66 #6 0x000000000052a5d3 in bdb_cache_entry_db_relock (bdb=0x9c7a20, txn=0xa66670, ei=0xd71720, rw=1, tryOnly=0, lock=0x7f2b814f94d0) at ../../../../servers/slapd/back-bdb/cache.c:198 #7 0x000000000052c1e7 in bdb_cache_modify (bdb=0x9c7a20, e=0x7f2b85445068, newAttrs=0x7f2b8267e258, txn=0xa66670, lock=0x7f2b814f94d0) at ../../../../servers/slapd/back-bdb/cache.c:1231 #8 0x00000000004f3f2d in bdb_modify (op=0x7f2b8167a430, rs=0x7f2b814f9820) at ../../../../servers/slapd/back-bdb/modify.c:711 #9 0x000000000059e458 in refresh_merge (op=0x7f2b8167a430, rs=0x7f2b8167a370) at ../../../../servers/slapd/overlays/pcache.c:3275 #10 0x000000000045c207 in slap_response_play (op=0x7f2b8167a430, rs=0x7f2b8167a370) at ../../../servers/slapd/result.c:505 #11 0x000000000045dd28 in slap_send_search_entry (op=0x7f2b8167a430, rs=0x7f2b8167a370) at ../../../servers/slapd/result.c:997 #12 0x00000000004fbfd0 in bdb_search (op=0x7f2b8167a430, rs=0x7f2b8167a370) ---Type <return> to continue, or q <return> to quit--- at ../../../../servers/slapd/back-bdb/search.c:962 #13 0x000000000059d86e in pcache_op_search (op=0x7f2b8167a430, rs=0x7f2b8167a370) at ../../../../servers/slapd/overlays/pcache.c:3037 #14 0x00000000004d9ba5 in overlay_op_walk (op=0x7f2b8167a430, rs=0x7f2b8167a370, which=op_search, oi=0x9c7430, on=0x9c7610) at ../../../servers/slapd/backover.c:661 #15 0x00000000004d9e52 in over_op_func (op=0x7f2b8167a430, rs=0x7f2b8167a370, which=op_search) at ../../../servers/slapd/backover.c:723 #16 0x00000000004d9f3a in over_op_search (op=0x7f2b8167a430, rs=0x7f2b8167a370) at ../../../servers/slapd/backover.c:750 #17 0x000000000059e9bb in refresh_query (op=0x7f2b8167a430, query=0xa66580, on=0x9c7610) at ../../../../servers/slapd/overlays/pcache.c:3371 #18 0x000000000059f03d in consistency_check (ctx=0x7f2b8167ab60, arg=0xa61910) at ../../../../servers/slapd/overlays/pcache.c:3492

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Re: (ITS#6952)
by Srinivas.Kondamadugu＠mphasis.com 25 May '11

25 May '11

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(ITS#6952) Unable to get the Accout Locked message via Password Policy
by srinivas.kondamadugu＠mphasis.com 25 May '11

25 May '11

Full_Name: Srinivas Kondamadugu Version: 2.4.23 OS: Windows URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (15.195.185.82) We installed and configured the OpenLDAP password policy and while testing with bind operation we are getting Error code as 49 (invalid credentials) but we need account locked messages to appeared. Even if we use ppolicy_use_lockout in ppolicy.la we are getting the same error code and when we view the admin console we are not able to see any operation attribute for the user w.r.t password policy etc., Configuration snnippet # required if the overlay is built dynamically moduleload ppolicy.la # invokes password policies for this DIT only overlay ppolicy # define the default policy ppolicy_default "uid=default,ou=pwpolicies,dc=mehisdomain,dc=com" ppolicy_use_lockout ppolicy_hash_cleartext

1 0

Re: (ITS#6915) memberof+accesslog duplicate reqStart
by hyc＠symas.com 24 May '11

24 May '11

ebackes(a)symas.com wrote: > The openldap-techincal traffic Michael mentioned is almost certainly the same issue. In our case, yes this could have appeared as early as 2.4.23. > > What I'm seeing now is that formerly memberof functioned with accesslog in > a delta-syncrepl type environment by having each stage of replication (master, hub, replica, etc) run the overlay to supply the changes. It seems like originally only the group change went through and the overlay relied on reqStart collisions to prevent its internal operations from reaching the replication log. > > So: the recent change that exposed this was something that changed the > order these things are applied and sent to accesslog. > > Changing memberof again to reveal only the group changes should probably a separate ITS, or perhaps a discussion (openldap-devel) on how we want it to work. As-is, the fix in git master breaks compatibility with configurations from prior releases. The breakage seems to go back to ITS#6329. The original design for memberOf was for the internal modifications to not be replicated. Instead, any replicas that wanted to maintain member information was expected to run an identical memberOf overlay configuration. The fact that memberOf didn't update the entryCSN on its internal modifications was intentional. This design constraint was broken by the fix to ITS#6329. The patch for #6329 and any ripple effect from it needs to be reverted. In general it's incorrect to replicate internal operations. The fanout from replicating every internal operation would be too large and the information content of what is being replicated is essentially nil. When the servers are configured identically they will maintain identical data by virtue of the overlays on each node performing the same internal operations in response to a given sequence of user operations. > Emily Backes > Symas - The LDAP Guys > ebackes(a)symas.com > > > > -- -- Howard Chu CTO, Symas Corp. http://www.symas.com Director, Highland Sun http://highlandsun.com/hyc/ Chief Architect, OpenLDAP http://www.openldap.org/project/

1 0

(ITS#6951) pcache: valgrind reports some errors when bind-caching is enabled
by ralf＠OpenLDAP.org 24 May '11

24 May '11

Full_Name: Ralf Haferkamp Version: 2.4.25/HEAD OS: URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (89.166.222.177) Submitted by: ralf I get this when starting a bind-caching slapo-pcache setup under valgrind: ==18290== Invalid write of size 1 ==18290== at 0x59628F: ftemp_attrs (pcache.c:490) ==18290== by 0x5A29E0: pc_cf_gen (pcache.c:4199) [..] ==18290== Address 0x768dcc6 is 0 bytes after a block of size 6 alloc'd ==18290== at 0x4C2683D: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) ==18290== by 0x509CC85: ber_memalloc_x (memory.c:228) ==18290== by 0x46B958: ch_malloc (ch_malloc.c:54) ==18290== by 0x596206: ftemp_attrs (pcache.c:448) [..] ==18290== ==18290== Invalid write of size 1 ==18290== at 0x5A3153: pc_cf_gen (pcache.c:4281) [..] ==18290== Address 0x768e437 is 0 bytes after a block of size 7 alloc'd ==18290== at 0x4C2683D: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) ==18290== by 0x509CC85: ber_memalloc_x (memory.c:228) ==18290== by 0x46B958: ch_malloc (ch_malloc.c:54) ==18290== by 0x5A30D5: pc_cf_gen (pcache.c:4270) [..] A fix is on the way to HEAD.

1 0

Re: (ITS#6920) OpenLDAP 2.4.25 / Berkeley DB 4.8.30 Solaris 10 x86 slapd hangs
by fumiyas＠osstech.jp 24 May '11

24 May '11

At Thu, 28 Apr 2011 18:05:43 GMT, mslby(a)deshaw.com wrote: > My company uses OpenLDAP 2.4.25 with Berkeley DB 4.8.30 compiled on Solaris > 10 x86 using Sun Studio. OpenLDAP is used as the backend for generic naming > services (passwd, group, netgroup etc?) as well as holding mail routing and > some custom data. We have master and slave servers and are using syncrepl > refresh and persist. Are you using Solaris nss_ldap and ldap_cachemgr(1M) on your Solaris 10 with OpenLDAP slapd? If so, Solaris libldap.so breaks your slapd process as the following scenario: (1) slapd calls some name service functions, e.g. getpwnam(3C). (2) Solaris nss_ldap (/usr/lib/nss_ldap.so.1) is loaded. (3) Solaris libldap.so (/usr/lib/libldap.so.5) is loaded. (4) Solaris libldap.so overrides ldap_*() and ber_*() functions in slapd (or OpenLDAP libldap_r.so and liblber.so). (5) OpenLDAP calls ldap_*() and ber_*() functions that are belong to Solaris libldap.so, not OpenLDAP's one. See also: http://www.openldap.org/lists/openldap-technical/200902/msg00000.html https://bugzilla.mozilla.org/show_bug.cgi?id=292127 http://bugzilla.padl.com/show_bug.cgi?id=203 -- -- Name: SATOH Fumiyasu (fumiyas @ osstech co jp) -- Business Home: http://www.OSSTech.co.jp/ -- Personal Home: http://www.SFO.jp/blog/ > Lately we have been experiencing hangs with slapd and I cannot figure out > what the cause is. Things will be humming along and then slapd will simply > stop accepting connections and answering any requests for reads/writes. We > have set the loglevel to 256 and there is nothing in the logs that > indicates what the issue it. At the time that the process goes catatonic all > syslogs from slapd stop > > I have not found a way to reproduce this on demand. > > Today we have had three hangs and the truss ouput is exactly the same on > all process. Once the slapd process gets in this state a simple kill does > not work. The syslog always says that slapd is waiting for tasks to > complete but this never happens. I need to kill -9 the pid. > > I am going to include all of the debug info that I have collected and > hopefully someone will have some idea what is going on. I also have a gcore > of the process if anyone wants and info from that > > All and any help is greatly appreciated

1 0

Re: (ITS#6950) pcache crashing when '+' or '*' is used in attrsets
by Ralf Haferkamp 24 May '11

24 May '11

'1.1' is also causing a crash (on shutdown)

1 0

(ITS#6950) pcache crashing when '+' or '*' is used in attrsets
by ralf＠OpenLDAP.org 24 May '11

24 May '11

Full_Name: Ralf Haferkamp Version: 2.4.25/HEAD OS: URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (89.166.222.177) Submitted by: ralf The pcache overlay crashes slapd when using * or + in a pcacheAttrset. It seems the problem was introduced with the recent changes to support caching of undefined attributes. Fix is on the way.

1 0

Re: (ITS#6941
by rhafer＠suse.de 24 May '11

24 May '11

> Some how this got duplicated from ITS#6940, please close. Done.

1 0

Re: (ITS#6943) segfault in rwmmap in 2.4.25
by masarati＠aero.polimi.it 24 May '11

24 May '11

On 05/23/2011 10:15 PM, Tim.Mooney(a)ndsu.edu wrote: > Thank you Pierangelo. We've been running with that patch since last > Friday without problems, so I'm comfortable with the fix. > > If you can do so without having to spend much time on it, could you give > a brief overview of what you believe might be involved in implementing the > longer fix? I won't make any promises, but if you give me a hint at what > would be involved, I might be able to contribute the code to skip mapping > when not needed. That seems like it would be very beneficial. I don't think it's worth the effort, because mapping and rewriting are somehow tightly joined, so as soon as the overlay is loaded it is nearly always worth to scan all data to check whether intervention is needed. Further optimization would make the code even more hairy without significant improvements. p.

1 0

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