autobuild[sn-devel-144]: intermittent test failure detected

[autobuild]

The autobuild test system (on sn-devel-144) has detected an intermittent failing test in 
the current master tree.

The autobuild log of the failure is available here:

   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-07-26-0818/flakey.log

The failure seems to be in the "samba" suite, whose build logs are available here:

   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-07-26-0818/samba.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-07-26-0818/samba.stdout
  
The top commit at the time of the failure was:

commit 4e711d18c8e9953aca2ca64179c3d0b305a41c62
Author: Ralph Boehme <slow at samba.org>
Date:   Wed Jul 25 20:02:23 2018 +0200

    smbd: don't client->connections without checking client != NULL first in exit_server_common()
    
    exit_server_common() can be called also in smbd processes without a
    smbXsrv_client structure, e.g. the parent or some background tasks.
    
    Signed-off-by: Ralph Boehme <slow at samba.org>
    Reviewed-by: Stefan Metzmacher <metze at samba.org>
    
    Autobuild-User(master): Stefan Metzmacher <metze at samba.org>
    Autobuild-Date(master): Thu Jul 26 01:29:38 CEST 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[821(5140)/889 at 1h20m39s] samba4.blackbox.smbclient(renamedc:local)(renamedc:local)
[822(5142)/889 at 1h20m39s] samba4.rpc.echo(labdc)
[823(5152)/889 at 1h20m43s] samba4.rpc.echo(labdc:local)
[824(5162)/889 at 1h20m46s] samba4.rpc.echo.testallowed(labdc:local)
[825(5172)/889 at 1h20m46s] samba4.rpc.echo.testdenied(labdc:local)
[826(5182)/889 at 1h20m46s] samba4.blackbox.smbclient(labdc:local)(labdc:local)
[827(5184)/889 at 1h20m47s] samba.tests.samba_tool.rodc(rodc:local)
[828(5193)/889 at 1h21m16s] samba.blackbox.rpcclient_samlogon(rodc:local)
[829(5197)/889 at 1h21m17s] samba.blackbox.rpcclient_samlogon_testallowed(rodc:local)
[830(5201)/889 at 1h21m17s] samba.blackbox.rpcclient_samlogon_testdenied(rodc:local)
[831(5205)/889 at 1h21m18s] samba4.drs.ridalloc_exop.python(vampire_dc)(vampire_dc)
[832(5216)/889 at 1h26m36s] samba4.drs.samba_tool_drs.python(vampire_dc)(vampire_dc:local)
[833(5230)/889 at 1h29m52s] samba4.drs.samba_tool_drs_showrepl.python(vampire_dc)(vampire_dc:local)
[834(5234)/889 at 1h30m1s] samba4.drs.replica_sync.python(vampire_dc)(vampire_dc:local)
[835(5250)/889 at 1h33m40s] samba4.drs.delete_object.python(vampire_dc)(vampire_dc)
[836(5252)/889 at 1h35m18s] samba4.drs.fsmo.python(vampire_dc)(vampire_dc)
[837(5257)/889 at 1h35m37s] samba4.drs.repl_move.python(vampire_dc)(vampire_dc)
[838(5278)/889 at 1h37m41s] samba4.drs.getnc_exop.python(vampire_dc)(vampire_dc)
[839(5290)/889 at 1h38m3s] samba4.drs.getnc_unpriv.python(vampire_dc)(vampire_dc)
[840(5294)/889 at 1h38m10s] samba4.drs.linked_attributes_drs.python(vampire_dc)(vampire_dc)
[841(5297)/889 at 1h38m12s] samba4.drs.link_conflicts.python(vampire_dc)(vampire_dc)
[842(5309)/889 at 1h50m54s] samba4.drs.samba_tool_drs.python(promoted_dc)(promoted_dc:local)
[843(5323)/889 at 1h54m50s] samba4.drs.samba_tool_drs_showrepl.python(promoted_dc)(promoted_dc:local)
[844(5327)/889 at 1h55m0s] samba4.drs.replica_sync.python(promoted_dc)(promoted_dc:local)
UNEXPECTED(error): samba4.drs.replica_sync.python(promoted_dc).replica_sync.DrsReplicaSyncTestCase.test_ReplConflictsRenamedVsNewRemoteWin(promoted_dc:local)
REASON: Exception: Exception: Traceback (most recent call last):
  File "/memdisk/autobuild/fl/b643326/samba/source4/torture/drs/python/replica_sync.py", line 329, in test_ReplConflictsRenamedVsNewRemoteWin
    self.ou2 = self._create_ou(self.ldb_dc2, "OU=Test Remote Rename Conflict")
  File "/memdisk/autobuild/fl/b643326/samba/source4/torture/drs/python/replica_sync.py", line 125, in _create_ou
    samdb.add_ldif(ldif)
  File "bin/python/samba/__init__.py", line 230, in add_ldif
    self.add(msg, controls)
LdbError: (68, 'LDAP error 68 LDAP_ENTRY_ALREADY_EXISTS -  <Entry OU=Test Remote Rename Conflict,OU=replica_sync5090654,DC=samba,DC=example,DC=com already exists> <>')

FAILED (0 failures, 1 errors and 0 unexpected successes in 0 testsuites)

A summary with detailed information can be found in:
  ./bin/ab/summary
TOP 10 slowest tests
samba4.drs.link_conflicts.python(vampire_dc)(vampire_dc) -> 762
samba4.ldap.rodc_rwdc.python(rodc)(rodc:local) -> 441
samba4.drs.ridalloc_exop.python(vampire_dc)(vampire_dc) -> 318
samba4.drs.samba_tool_drs.python(promoted_dc)(promoted_dc:local) -> 236
samba4.rpc.samr.passwords.lockout on ncacn_np with (ad_dc_ntvfs) -> 230
samba4.ldap.vlv.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 222
samba4.drs.replica_sync.python(vampire_dc)(vampire_dc:local) -> 219
samba4.rpc.samr.passwords.pwdlastset on ncacn_np with (ad_dc_ntvfs) -> 203
samba4.drs.samba_tool_drs.python(vampire_dc)(vampire_dc:local) -> 196
samba4.ldap.password_lockout.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 168
ERROR: test failed with exit code 1