[Freeipa-users] replica DS failure deadlock

Andrew E. Bruno aebruno2 at buffalo.edu
Wed Oct 19 13:48:54 UTC 2016 

On Wed, Oct 19, 2016 at 10:13:26AM +0200, Ludwig Krispenz wrote:
> 
> On 10/18/2016 08:52 PM, Andrew E. Bruno wrote:
> > We had one of our replicas fail today with the following errors:
> > 
> > 
> > [18/Oct/2016:13:40:47 -0400] agmt="cn=meTosrv-m14-32.cbls.ccr.buffalo.edu" (srv-m14-32:389) - Can't locate CSN 58065ef3000100030000 in the changelog (DB rc=-30988). If replication stops, the consumer may need to be reinitialized.
> > [18/Oct/2016:13:43:07 -0400] NSMMReplicationPlugin - changelog program - _cl5WriteOperationTxn: retry (49) the transaction (csn=58065f74000500040000) failed (rc=-30993 (BDB0068 DB_LOCK_DEADLOCK: Locker killed to resolve a deadlock))
> > [18/Oct/2016:13:43:07 -0400] NSMMReplicationPlugin - changelog program - _cl5WriteOperationTxn: failed to write entry with csn (58065f74000500040000); db error - -30993 BDB0068 DB_LOCK_DEADLOCK: Locker killed to resolve a deadlock
> > [18/Oct/2016:13:43:07 -0400] NSMMReplicationPlugin - write_changelog_and_ruv: can't add a change for uid=janedoe,cn=users,cn=accounts,dc=cbls,dc=ccr,dc=buffalo,dc=edu (uniqid: 939bca48-2ced11e5-ac0b8f7e-e0b1a377, optype: 64) to changelog csn 58065f74000500040000
> > [18/Oct/2016:13:43:07 -0400] - SLAPI_PLUGIN_BE_TXN_POST_MODRDN_FN plugin returned error but did not set SLAPI_RESULT_CODE
> > [18/Oct/2016:13:43:07 -0400] NSMMReplicationPlugin - process_postop: Failed to apply update (58065f74000500040000) error (1).  Aborting replication session(conn=1314106 op=1688559)
> > [18/Oct/2016:13:43:12 -0400] - cos_cache_change_notify: modified entry is NULL--updating cache just in case
> > [18/Oct/2016:13:43:12 -0400] - Skipping CoS Definition cn=Password Policy,cn=accounts,dc=cbls,dc=ccr,dc=buffalo,dc=edu--no CoS Templates found, which should be added before the CoS Definition.
> > [18/Oct/2016:13:43:20 -0400] - Operation error fetching Null DN (4a729f9a-955a11e6-aaffa516-e778e883), error -30993.
> > [18/Oct/2016:13:43:20 -0400] - dn2entry_ext: Failed to get id for changenumber=30856302,cn=changelog from entryrdn index (-30993)
> > [18/Oct/2016:13:43:20 -0400] - Operation error fetching changenumber=30856302,cn=changelog (null), error -30993.
> > [18/Oct/2016:13:43:20 -0400] DSRetroclPlugin - replog: an error occured while adding change number 30856302, dn = changenumber=30856302,cn=changelog: Operations error.
> > [18/Oct/2016:13:43:20 -0400] retrocl-plugin - retrocl_postob: operation failure [1]
> > [18/Oct/2016:13:43:20 -0400] NSMMReplicationPlugin - process_postop: Failed to apply update (58065f9f000000600000) error (1).  Aborting replication session(conn=1901274 op=5)
> > [18/Oct/2016:13:43:24 -0400] - ldbm_back_seq deadlock retry BAD 1601, err=0 BDB0062 Successful return: 0
> > [18/Oct/2016:13:43:25 -0400] NSMMReplicationPlugin - changelog program - _cl5WriteOperationTxn: retry (49) the transaction (csn=58065f7c000a00040000) failed (rc=-30993 (BDB0068 DB_LOCK_DEADLOCK: Locker killed to resolve a deadlock))
> > [18/Oct/2016:13:43:25 -0400] NSMMReplicationPlugin - changelog program - _cl5WriteOperationTxn: failed to write entry with csn (58065f7c000a00040000); db error - -30993 BDB0068 DB_LOCK_DEADLOCK: Locker killed to resolve a deadlock
> > [18/Oct/2016:13:43:25 -0400] NSMMReplicationPlugin - write_changelog_and_ruv: can't add a change for uid=janedoe,cn=users,cn=accounts,dc=cbls,dc=ccr,dc=buffalo,dc=edu (uniqid: 4080421a-2d0211e5-ac0b8f7e-e0b1a377, optype: 64) to changelog csn 58065f7c000a00040000
> > 
> > 
> > ns-slapd was hung so we restarted and now it's stuck and won't come back up. It
> > hangs up here:
> > 
> > [18/Oct/2016:14:12:31 -0400] - Skipping CoS Definition cn=Password Policy,cn=accounts,dc=cbls,dc=ccr,dc=buffalo,dc=edu--no CoS Templates found, which should be added before the CoS Definition.
> > [18/Oct/2016:14:12:31 -0400] NSMMReplicationPlugin - changelog program - _cl5NewDBFile: PR_DeleteSemaphore: /var/lib/dirsrv/slapd-CBLS-CCR-BUFFALO-EDU/cldb/a32992ce-71b811e5-9d33a516-e778e883.sema; NSPR error - -5943
> > [18/Oct/2016:14:12:32 -0400] NSMMReplicationPlugin - changelog program - _cl5NewDBFile: PR_DeleteSemaphore: /var/lib/dirsrv/slapd-CBLS-CCR-BUFFALO-EDU/cldb/986efe12-71b811e5-9d33a516-e778e883.sema; NSPR error - -5943
> > 
> > 
> > Tried deleting the semaphore files and restarting but no luck. Attached
> > is a stacktrace of the stuck ns-slapd process.
> > 
> > Here's the versions were running:
> > 
> > ipa-server-4.2.0-15.0.1.el7.centos.19.x86_64
> > 389-ds-base-1.3.4.0-33.el7_2.x86_64
> > 
> > FWIW, we were experimenting with the new life-cycle management features,
> > specifically "preserved" users and deleted the user "janedoe" when this
> > happened.  From the errors above looks like this host failed to
> > replicate the change?  Not sure if this is related or not.
> > 
> > Is it possible to recover the database? Thanks in advance for any pointers.
> from the stack trace the process is not hanging, it is trying to recover.
> After a crash/kill  the changelog does not contai a RUV and it is
> reconstructed by reading all records in the changelog, if this is large it
> can take some time.
> If you look at that part of the stack repeatedly,
> 
> #4  0x00007f4e88daeba5 in cl5DBData2Entry (data=<optimized out>, len=<optimized out>, entry=entry at entry=0x7ffff6598910) at ldap/servers/plugins/replication/cl5_api.c:2342
>         rc = <optimized out>
>         version = <optimized out>
>         pos = 0x7f4e9839d091 ""
>         strCSN = 0x0
>         op = 0x7ffff6598980
>         add_mods = 0x7f4e983a5e80
>         rawDN = 0x7f4e98396e20 "fqdn=cpn-k08-29-02.cbls.ccr.buffalo.edu,cn=computers,cn=accounts,dc=cbls,dc=ccr,dc=buffalo,dc=edu"
>         s = "\300\037>\230N\177\000\000@\210Y\366\377\177\000\000@\210Y\366\377"
> #5  0x00007f4e88daf5d6 in _cl5GetNextEntry (entry=entry at entry=0x7ffff6598910, iterator=0x7f4e983a5e80) at ldap/servers/plugins/replication/cl5_api.c:5291
>         rc = 0
>         it = 0x7f4e983a5e80
>         key = {data = 0x0, size = 21, ulen = 0, dlen = 0, doff = 0, app_data = 0x0, flags = 16}
>         data = {data = 0x7f4e9839cff0, size = 335, ulen = 0, dlen = 0, doff = 0, app_data = 0x0, flags = 16}
> #6  0x00007f4e88dafb34 in _cl5ConstructRUV (purge=1, obj=0x7f4e983e1fc0, replGen=0x7ffff6598910 "\200\211Y\366\377\177") at ldap/servers/plugins/replication/cl5_api.c:4306
> 
> 
> you should see some progress in which entry is handled
> 

Ludwig, thanks very much for the help. As you pointed out just needed to let it
finish.  ns-slapd eventually came back up once it finished reading the
changelog. Still seeing some errors related to the NSMMReplicationPlugin failed
to apply update and from the managed-entries-plugin. Can these safely be
ignored or are they indicative of a more serious problem? 

[19/Oct/2016:09:28:46 -0400] - Operation error fetching Null DN (e73b48a4-95ff11e6-8bc7a516-e778e883), error -30993.
[19/Oct/2016:09:28:46 -0400] - dn2entry_ext: Failed to get id for changenumber=30856335,cn=changelog from entryrdn index (-30993)
[19/Oct/2016:09:28:46 -0400] - Operation error fetching changenumber=30856335,cn=changelog (null), error -30993.
[19/Oct/2016:09:28:46 -0400] DSRetroclPlugin - replog: an error occured while adding change number 30856335, dn = changenumber=30856335,cn=changelog: Operations error.
[19/Oct/2016:09:28:46 -0400] retrocl-plugin - retrocl_postob: operation failure [1]
[19/Oct/2016:09:28:46 -0400] NSMMReplicationPlugin - process_postop: Failed to apply update (5806acf7000000600000) error (1).  Aborting replication session(conn=9 op=28)
[19/Oct/2016:09:28:54 -0400] - Operation error fetching Null DN (e73b48a7-95ff11e6-8bc7a516-e778e883), error -30993.
[19/Oct/2016:09:28:59 -0400] - dn2entry_ext: Failed to get id for changenumber=30856337,cn=changelog from entryrdn index (-30993)
[19/Oct/2016:09:29:17 -0400] - Operation error fetching changenumber=30856337,cn=changelog (null), error -30993.
[19/Oct/2016:09:29:17 -0400] DSRetroclPlugin - replog: an error occured while adding change number 30856337, dn = changenumber=30856337,cn=changelog: Operations error.
[19/Oct/2016:09:29:17 -0400] retrocl-plugin - retrocl_postob: operation failure [1]
[19/Oct/2016:09:29:17 -0400] NSMMReplicationPlugin - process_postop: Failed to apply update (5806acf7000000600000) error (1).  Aborting replication session(conn=15 op=5)
[19/Oct/2016:09:29:20 -0400] - Retry count exceeded in delete
[19/Oct/2016:09:29:20 -0400] DSRetroclPlugin - delete_changerecord: could not delete change record 30712389 (rc: 51)
[19/Oct/2016:09:29:28 -0400] - Operation error fetching Null DN (0afe8e82-960011e6-8bc7a516-e778e883), error -30993.
[19/Oct/2016:09:29:28 -0400] - dn2entry_ext: Failed to get id for changenumber=30856351,cn=changelog from entryrdn index (-30993)
[19/Oct/2016:09:29:28 -0400] - Operation error fetching changenumber=30856351,cn=changelog (null), error -30993.
[19/Oct/2016:09:29:28 -0400] DSRetroclPlugin - replog: an error occured while adding change number 30856351, dn = changenumber=30856351,cn=changelog: Operations error.
[19/Oct/2016:09:29:28 -0400] retrocl-plugin - retrocl_postob: operation failure [1]
[19/Oct/2016:09:29:28 -0400] NSMMReplicationPlugin - process_postop: Failed to apply update (5806acf7000000600000) error (1).  Aborting replication session(conn=25 op=5)
[19/Oct/2016:09:29:31 -0400] - Retry count exceeded in delete
[19/Oct/2016:09:29:31 -0400] DSRetroclPlugin - delete_changerecord: could not delete change record 30712865 (rc: 51)
[19/Oct/2016:09:29:39 -0400] - Operation error fetching Null DN (0afe8e90-960011e6-8bc7a516-e778e883), error -30993.
[19/Oct/2016:09:29:39 -0400] - dn2entry_ext: Failed to get id for changenumber=30856364,cn=changelog from entryrdn index (-30993)
[19/Oct/2016:09:29:39 -0400] - Operation error fetching changenumber=30856364,cn=changelog (null), error -30993.
[19/Oct/2016:09:29:39 -0400] DSRetroclPlugin - replog: an error occured while adding change number 30856364, dn = changenumber=30856364,cn=changelog: Operations error.
[19/Oct/2016:09:29:39 -0400] retrocl-plugin - retrocl_postob: operation failure [1]
[19/Oct/2016:09:29:39 -0400] NSMMReplicationPlugin - process_postop: Failed to apply update (5806acf7000000600000) error (1).  Aborting replication session(conn=35 op=5)
[19/Oct/2016:09:29:42 -0400] - Retry count exceeded in delete
[19/Oct/2016:09:29:42 -0400] DSRetroclPlugin - delete_changerecord: could not delete change record 30713364 (rc: 51)
[19/Oct/2016:09:29:42 -0400] - Operation error fetching Null DN (0afe8ea0-960011e6-8bc7a516-e778e883), error -30993.
[19/Oct/2016:09:29:42 -0400] - dn2entry_ext: Failed to get id for changenumber=30856379,cn=changelog from entryrdn index (-30993)
[19/Oct/2016:09:29:42 -0400] - Operation error fetching changenumber=30856379,cn=changelog (null), error -30993.
[19/Oct/2016:09:29:42 -0400] DSRetroclPlugin - replog: an error occured while adding change number 30856379, dn = changenumber=30856379,cn=changelog: Operations error.
[19/Oct/2016:09:29:42 -0400] retrocl-plugin - retrocl_postob: operation failure [1]
[19/Oct/2016:09:29:42 -0400] NSMMReplicationPlugin - process_postop: Failed to apply update (5806acf7000000600000) error (1).  Aborting replication session(conn=36 op=5)
[19/Oct/2016:09:29:50 -0400] - Operation error fetching Null DN (0afe8ea2-960011e6-8bc7a516-e778e883), error -30993.
[19/Oct/2016:09:29:50 -0400] - dn2entry_ext: Failed to get id for changenumber=30856380,cn=changelog from entryrdn index (-30993)
[19/Oct/2016:09:29:50 -0400] - Operation error fetching changenumber=30856380,cn=changelog (null), error -30993.
[19/Oct/2016:09:29:50 -0400] DSRetroclPlugin - replog: an error occured while adding change number 30856380, dn = changenumber=30856380,cn=changelog: Operations error.
[19/Oct/2016:09:29:50 -0400] retrocl-plugin - retrocl_postob: operation failure [1]
...
[19/Oct/2016:09:30:06 -0400] managed-entries-plugin - mep_mod_post_op: Unable to find config for origin entry "uid=janedoe,cn=deleted users,cn=accounts,cn=provisioning,dc=cbls,dc=ccr,dc=buffalo,dc=edu".
[19/Oct/2016:09:30:06 -0400] managed-entries-plugin - mep_mod_post_op: Unable to find config for origin entry "uid=janedoe,cn=deleted users,cn=accounts,cn=provisioning,dc=cbls,dc=ccr,dc=buffalo,dc=edu".

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