Hi,

i'm also experiencing slapd deadlocks/lockups when using memberOf & autogroup, w/ 2.4.31. Both modules/overlays seem to step on each other's toes when updating an entry. Not 100% sure if it's the same issue as the OP was experiencing though.

My config is the following : - i have a ou=people branch with inetOrgPerson objects, each one having an organization attr. - i have a ou=groups branch with groupOfNames objects, each populated by autogroup by using a labeledURI doing a filter on the organization attr (among other conditions) of the inetOrgPerson objects. - and finally, i have memberOf overlay that updates the inetOrgPerson objects with the final groups membership.

When modifiying the organization attribute of an inetOrgPerson (and thus triggering an update of groups & membership at the same time), slapd deadlocks. It happens both if the inetOrgPerson gets out of a group, or is now a new member of a group (only showing the tail of the debug log, but i can provide it all):

51bb233b oc_check_required entry (uid=person,ou=people,dc=myorg,dc=fr), objectClass "inetOrgPerson" 51bb233b oc_check_allowed type "cn" 51bb233b oc_check_allowed type "structuralObjectClass" 51bb233b oc_check_allowed type "entryUUID" 51bb233b oc_check_allowed type "creatorsName" 51bb233b oc_check_allowed type "createTimestamp" 51bb233b oc_check_allowed type "objectClass" 51bb233b oc_check_allowed type "uid" 51bb233b oc_check_allowed type "givenName" 51bb233b oc_check_allowed type "sn" 51bb233b oc_check_allowed type "userPassword" 51bb233b oc_check_allowed type "title" 51bb233b oc_check_allowed type "employeeType" 51bb233b oc_check_allowed type "roomNumber" 51bb233b oc_check_allowed type "mail" 51bb233b oc_check_allowed type "telephoneNumber" 51bb233b oc_check_allowed type "memberOf" 51bb233b oc_check_allowed type "o" 51bb233b oc_check_allowed type "entryCSN" 51bb233b oc_check_allowed type "modifyTimestamp" 51bb233b oc_check_allowed type "modifiersName" 51bb233b => entry_encode(0x00000006): 51bb233b <= entry_encode(0x00000006):

At that point, there are three active threads in gdb:

^C Program received signal SIGINT, Interrupt. 0x00007ffff5c67e75 in pthread_join () from /lib/x86_64-linux-gnu/libpthread.so.0 (gdb) info thread Id Target Id Frame 3 Thread 0x7ffff0f53700 (LWP 16492) 0x00007ffff5c6b2d4 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0 2 Thread 0x7ffff1754700 (LWP 16491) 0x00007ffff59b10d3 in epoll_wait () from /lib/x86_64-linux-gnu/libc.so.6 * 1 Thread 0x7ffff7ebb700 (LWP 16490) 0x00007ffff5c67e75 in pthread_join () from /lib/x86_64-linux-gnu/libpthread.so.0

thread 1 & 2 seem okay...

(gdb) bt #0 0x00007ffff5c67e75 in pthread_join () from /lib/x86_64-linux-gnu/libpthread.so.0 #1 0x00007ffff7f0fca9 in slapd_daemon () at ../../../../servers/slapd/daemon.c:2930 #2 0x00007ffff7ef687c in main (argc=<optimized out>, argv=<optimized out>) at ../../../../servers/slapd/main.c:1012 (gdb) thread 2 [Switching to thread 2 (Thread 0x7ffff1754700 (LWP 16491))] #0 0x00007ffff59b10d3 in epoll_wait () from /lib/x86_64-linux-gnu/libc.so.6 (gdb) bt #0 0x00007ffff59b10d3 in epoll_wait () from /lib/x86_64-linux-gnu/libc.so.6 #1 0x00007ffff7f0d721 in slapd_daemon_task (ptr=<optimized out>) at ../../../../servers/slapd/daemon.c:2540 #2 0x00007ffff5c66b50 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0 #3 0x00007ffff59b0a7d in clone () from /lib/x86_64-linux-gnu/libc.so.6 #4 0x0000000000000000 in ?? ()

but thread 3 seems to lock with himself, maybe trying to modify the same entry via autogroup & memberof at the same time ?

(gdb) thread 3 [Switching to thread 3 (Thread 0x7ffff0f53700 (LWP 16492))] #0 0x00007ffff5c6b2d4 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0 (gdb) bt #0 0x00007ffff5c6b2d4 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0 #1 0x00007ffff74fe9ab in __db_pthread_mutex_lock () from /usr/lib/x86_64-linux-gnu/libdb-5.1.so #2 0x00007ffff758d5ca in __lock_get_internal () from /usr/lib/x86_64-linux-gnu/libdb-5.1.so #3 0x00007ffff758e9b3 in __lock_vec () from /usr/lib/x86_64-linux-gnu/libdb-5.1.so #4 0x00007ffff758ef18 in __lock_vec_pp () from /usr/lib/x86_64-linux-gnu/libdb-5.1.so #5 0x00007ffff32234a0 in hdb_cache_entry_db_relock (bdb=bdb@entry=0x7ffff83226a0, txn=<optimized out>, ei=0x7ffff82db7b0, rw=rw@entry=1, tryOnly=tryOnly@entry=0, lock=lock@entry=0x7ffff0f4fc70) at cache.c:198 #6 0x00007ffff3223eb3 in hdb_cache_modify (bdb=bdb@entry=0x7ffff83226a0, e=e@entry=0x7ffff85045c8, newAttrs=0x7ffff8517f48, txn=<optimized out>, lock=lock@entry=0x7ffff0f4fc70) at cache.c:1231 #7 0x00007ffff321255a in hdb_modify (op=0x7ffff0f503b0, rs=0x7ffff0f501d0) at modify.c:711 #8 0x00007ffff7f801c6 in overlay_op_walk (op=op@entry=0x7ffff0f503b0, rs=0x7ffff0f501d0, which=op_modify, oi=0x7ffff8325c90, on=0x0) at ../../../../servers/slapd/backover.c:671 #9 0x00007ffff7f8031b in over_op_func (op=0x7ffff0f503b0, rs=<optimized out>, which=<optimized out>) at ../../../../servers/slapd/backover.c:723 #10 0x00007ffff29dabb9 in memberof_value_modify (op=op@entry=0x7ffff0f50d40, ndn=<optimized out>, ad=0x7ffff82d3420, old_dn=old_dn@entry=0x0, old_ndn=old_ndn@entry=0x0, new_dn=new_dn@entry=0x7ffff0f50d68, new_ndn=new_ndn@entry=0x7ffff0f50d78) at ../../../../../servers/slapd/overlays/memberof.c:411 #11 0x00007ffff29db548 in memberof_res_modify (op=0x7ffff0f50d40, rs=<optimized out>) at ../../../../../servers/slapd/overlays/memberof.c:1457 #12 0x00007ffff7f227d6 in slap_response_play (op=op@entry=0x7ffff0f50d40, rs=rs@entry=0x7ffff0f50cd0) at ../../../../servers/slapd/result.c:507 #13 0x00007ffff7f22d6e in send_ldap_response (op=op@entry=0x7ffff0f50d40, rs=rs@entry=0x7ffff0f50cd0) at ../../../../servers/slapd/result.c:582 #14 0x00007ffff7f23816 in slap_send_ldap_result (op=0x7ffff0f50d40, rs=0x7ffff0f50cd0) at ../../../../servers/slapd/result.c:860 #15 0x00007ffff3211e67 in hdb_modify (op=0x7ffff0f50d40, rs=0x7ffff0f50cd0) at modify.c:749 #16 0x00007ffff7f801c6 in overlay_op_walk (op=op@entry=0x7ffff0f50d40, rs=0x7ffff0f50cd0, which=op_modify, oi=0x7ffff8325c90, on=0x0) at ../../../../servers/slapd/backover.c:671 #17 0x00007ffff7f8031b in over_op_func (op=0x7ffff0f50d40, rs=<optimized out>, which=<optimized out>) at ../../../../servers/slapd/backover.c:723 #18 0x00007ffff2be449f in autogroup_add_member_to_group (op=op@entry=0x7ffff82d9ab0, dn=dn@entry=0x7ffff82d9ad8, ndn=ndn@entry=0x7ffff82d9ae8, age=age@entry=0x7ffff82f8ed0) at autogroup.c:146 #19 0x00007ffff2be6aa2 in autogroup_response (op=0x7ffff82d9ab0, rs=<optimized out>) at autogroup.c:1302 #20 0x00007ffff7f7f598 in over_back_response (op=0x7ffff82d9ab0, rs=0x7ffff0f52a50) at ../../../../servers/slapd/backover.c:237 #21 0x00007ffff7f227d6 in slap_response_play (op=op@entry=0x7ffff82d9ab0, rs=rs@entry=0x7ffff0f52a50) at ../../../../servers/slapd/result.c:507 #22 0x00007ffff7f22d6e in send_ldap_response (op=op@entry=0x7ffff82d9ab0, rs=rs@entry=0x7ffff0f52a50) at ../../../../servers/slapd/result.c:582 #23 0x00007ffff7f23816 in slap_send_ldap_result (op=0x7ffff82d9ab0, rs=0x7ffff0f52a50) at ../../../../servers/slapd/result.c:860 #24 0x00007ffff3211e67 in hdb_modify (op=0x7ffff82d9ab0, rs=0x7ffff0f52a50) at modify.c:749 #25 0x00007ffff7f801c6 in overlay_op_walk (op=op@entry=0x7ffff82d9ab0, rs=0x7ffff0f52a50, which=op_modify, oi=0x7ffff8325c90, on=0x0) at ../../../../servers/slapd/backover.c:671 #26 0x00007ffff7f8031b in over_op_func (op=0x7ffff82d9ab0, rs=<optimized out>, which=<optimized out>) at ../../../../servers/slapd/backover.c:723 #27 0x00007ffff7f2a569 in fe_op_modify (op=0x7ffff82d9ab0, rs=0x7ffff0f52a50) at ../../../../servers/slapd/modify.c:303 #28 0x00007ffff7f2c42d in do_modify (op=0x7ffff82d9ab0, rs=0x7ffff0f52a50) at ../../../../servers/slapd/modify.c:177 #29 0x00007ffff7f12961 in connection_operation (ctx=ctx@entry=0x7ffff0f52ba0, arg_v=arg_v@entry=0x7ffff82d9ab0) at ../../../../servers/slapd/connection.c:1150 #30 0x00007ffff7f12c84 in connection_read_thread (ctx=0x7ffff0f52ba0, argv=<optimized out>) at ../../../../servers/slapd/connection.c:1286 #31 0x00007ffff7a73ff3 in ?? () from /usr/lib/x86_64-linux-gnu/libldap_r-2.4.so.2 #32 0x00007ffff5c66b50 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0 #33 0x00007ffff59b0a7d in clone () from /lib/x86_64-linux-gnu/libc.so.6 #34 0x0000000000000000 in ?? ()

If i examine the three hdb_modify() calls in that trace, the one in #7 and the one in #24 try to work on the same entry (dummy value is the modified inetOrgPerson), and the one in #15 modifies the groupOfNames from which the inetOrgPerson is a new member.

I suppose it shouldn't happen...