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-144/2019-02-06-2017/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-144/2019-02-06-2017/samba.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2019-02-06-2017/samba.stdout
  
The top commit at the time of the failure was:

commit bf91ee0a9727cc392583fe84ad069204be758515
Author: Ralph Boehme <slow at samba.org>
Date:   Tue Feb 5 14:08:56 2019 +0100

    tldap: avoid more use after free errors
    
    See the previous commit for an explanation. :)
    
    Bug: https://bugzilla.samba.org/show_bug.cgi?id=13776
    
    Signed-off-by: Ralph Boehme <slow at samba.org>
    Reviewed-by: Volker Lendecke <vl at samba.org>
    
    Autobuild-User(master): Ralph Böhme <slow at samba.org>
    Autobuild-Date(master): Wed Feb  6 10:19:12 CET 2019 on sn-devel-144

and the last 50 lines of the stdout log were:

[787(4855)/853 at 1h24m28s] samba4.rpc.samr.large-dc.two(vampire_dc)
[788(4858)/853 at 1h24m37s] samba4.rpc.echo(rodc)
[789(4868)/853 at 1h24m40s] samba4.rpc.echo(rodc:local)
[790(4878)/853 at 1h24m44s] samba4.rpc.echo.testallowed(rodc:local)
[791(4888)/853 at 1h24m47s] samba4.rpc.echo.testdenied(rodc:local)
[792(4898)/853 at 1h24m51s] samba4.blackbox.smbclient(rodc:local)(rodc:local)
[793(4900)/853 at 1h24m52s] samba.tests.samba_tool.rodc(rodc:local)
[794(4909)/853 at 1h25m22s] samba.blackbox.rpcclient_samlogon(rodc:local)
[795(4913)/853 at 1h25m23s] samba.blackbox.rpcclient_samlogon_testallowed(rodc:local)
[796(4917)/853 at 1h25m24s] samba.blackbox.rpcclient_samlogon_testdenied(rodc:local)
[797(4921)/853 at 1h25m24s] samba4.drs.ridalloc_exop.python(vampire_dc)(vampire_dc)
[798(4932)/853 at 1h30m56s] samba4.drs.samba_tool_drs.python(vampire_dc)(vampire_dc:local)
[799(4946)/853 at 1h34m22s] samba4.drs.samba_tool_drs_showrepl.python(vampire_dc)(vampire_dc:local)
[800(4950)/853 at 1h34m35s] samba4.drs.replica_sync.python(vampire_dc)(vampire_dc:local)
[801(4966)/853 at 1h39m20s] samba4.drs.delete_object.python(vampire_dc)(vampire_dc)
[802(4968)/853 at 1h39m32s] samba4.drs.fsmo.python(vampire_dc)(vampire_dc)
[803(4973)/853 at 1h39m51s] samba4.drs.repl_move.python(vampire_dc)(vampire_dc)
[804(4994)/853 at 1h43m22s] samba4.drs.getnc_exop.python(vampire_dc)(vampire_dc)
[805(5006)/853 at 1h43m46s] samba4.drs.getnc_unpriv.python(vampire_dc)(vampire_dc)
[806(5010)/853 at 1h43m52s] samba4.drs.linked_attributes_drs.python(vampire_dc)(vampire_dc)
[807(5013)/853 at 1h43m54s] samba4.drs.link_conflicts.python(vampire_dc)(vampire_dc)
[808(5025)/853 at 1h50m8s] samba4.drs.samba_tool_drs.python(promoted_dc)(promoted_dc:local)
[809(5039)/853 at 1h53m37s] samba4.drs.samba_tool_drs_showrepl.python(promoted_dc)(promoted_dc:local)
[810(5043)/853 at 1h53m49s] samba4.drs.replica_sync.python(promoted_dc)(promoted_dc:local)
UNEXPECTED(error): samba4.drs.replica_sync.python(promoted_dc).replica_sync.DrsReplicaSyncTestCase.test_ReplConflictsRemoteWin_with_child(promoted_dc:local)
REASON: Exception: Exception: Traceback (most recent call last):
  File "/memdisk/autobuild/fl/b3692527/samba/source4/torture/drs/python/replica_sync.py", line 278, in test_ReplConflictsRemoteWin_with_child
    self.ou2 = self._create_ou(self.ldb_dc2, "OU=Test Parent Remote Conflict")
  File "/memdisk/autobuild/fl/b3692527/samba/source4/torture/drs/python/replica_sync.py", line 126, in _create_ou
    samdb.add_ldif(ldif)
  File "bin/python/samba/__init__.py", line 230, in add_ldif
    self.add(msg, controls)
_ldb.LdbError: (68, 'LDAP error 68 LDAP_ENTRY_ALREADY_EXISTS -  <Entry OU=Test Parent Remote Conflict,OU=replica_sync1770200,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.ldap.rodc_rwdc.python(rodc)(rodc:local) -> 462
samba4.drs.link_conflicts.python(vampire_dc)(vampire_dc) -> 374
samba4.ldap.confidential_attr.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 353
samba4.drs.ridalloc_exop.python(vampire_dc)(vampire_dc) -> 332
samba4.drs.replica_sync.python(vampire_dc)(vampire_dc:local) -> 285
samba4.ldap.vlv.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 273
samba4.rpc.samr.passwords.lockout on ncacn_np with (ad_dc_ntvfs) -> 226
samba4.drs.repl_move.python(vampire_dc)(vampire_dc) -> 211
samba4.drs.samba_tool_drs.python(promoted_dc)(promoted_dc:local) -> 209
samba4.drs.samba_tool_drs.python(vampire_dc)(vampire_dc:local) -> 205
ERROR: test failed with exit code 1