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-144/2018-10-14-1413/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-144/2018-10-14-1413/samba.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-10-14-1413/samba.stdout
  
The top commit at the time of the failure was:

commit 2fc855e7d2458249ca6fc8ffdf1d7633ab84cc55
Author: Douglas Bagnall <douglas.bagnall at catalyst.net.nz>
Date:   Thu Oct 11 11:59:52 2018 +1300

    samba-tool drs showrepl: do not crash if no dnsHostName found
    
    This should not happen, but it does sometimes in an autobuild
    environment. Rather than reporting this by crashing, we report it by
    showing there is no DNS name.
    
    Signed-off-by: Douglas Bagnall <douglas.bagnall at catalyst.net.nz>
    
    Autobuild-User(master): Douglas Bagnall <dbagnall at samba.org>
    Autobuild-Date(master): Fri Oct 12 15:27:07 CEST 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[787(4799)/849 at 1h21m26s] samba4.rpc.samr.large-dc.two(vampire_dc)
[788(4802)/849 at 1h21m35s] samba4.rpc.echo(rodc)
[789(4812)/849 at 1h21m38s] samba4.rpc.echo(rodc:local)
[790(4822)/849 at 1h21m42s] samba4.rpc.echo.testallowed(rodc:local)
[791(4832)/849 at 1h21m46s] samba4.rpc.echo.testdenied(rodc:local)
[792(4842)/849 at 1h21m49s] samba4.blackbox.smbclient(rodc:local)(rodc:local)
[793(4844)/849 at 1h21m50s] samba.tests.samba_tool.rodc(rodc:local)
[794(4853)/849 at 1h22m20s] samba.blackbox.rpcclient_samlogon(rodc:local)
[795(4857)/849 at 1h22m20s] samba.blackbox.rpcclient_samlogon_testallowed(rodc:local)
[796(4861)/849 at 1h22m21s] samba.blackbox.rpcclient_samlogon_testdenied(rodc:local)
[797(4865)/849 at 1h22m22s] samba4.drs.ridalloc_exop.python(vampire_dc)(vampire_dc)
[798(4876)/849 at 1h27m44s] samba4.drs.samba_tool_drs.python(vampire_dc)(vampire_dc:local)
[799(4890)/849 at 1h31m4s] samba4.drs.samba_tool_drs_showrepl.python(vampire_dc)(vampire_dc:local)
[800(4894)/849 at 1h31m17s] samba4.drs.replica_sync.python(vampire_dc)(vampire_dc:local)
[801(4910)/849 at 1h35m5s] samba4.drs.delete_object.python(vampire_dc)(vampire_dc)
[802(4912)/849 at 1h35m15s] samba4.drs.fsmo.python(vampire_dc)(vampire_dc)
[803(4917)/849 at 1h35m31s] samba4.drs.repl_move.python(vampire_dc)(vampire_dc)
[804(4938)/849 at 1h37m39s] samba4.drs.getnc_exop.python(vampire_dc)(vampire_dc)
[805(4950)/849 at 1h38m1s] samba4.drs.getnc_unpriv.python(vampire_dc)(vampire_dc)
[806(4954)/849 at 1h38m7s] samba4.drs.linked_attributes_drs.python(vampire_dc)(vampire_dc)
[807(4957)/849 at 1h38m9s] samba4.drs.link_conflicts.python(vampire_dc)(vampire_dc)
[808(4969)/849 at 1h46m58s] samba4.drs.samba_tool_drs.python(promoted_dc)(promoted_dc:local)
[809(4983)/849 at 1h50m18s] samba4.drs.samba_tool_drs_showrepl.python(promoted_dc)(promoted_dc:local)
[810(4987)/849 at 1h50m30s] samba4.drs.replica_sync.python(promoted_dc)(promoted_dc:local)
UNEXPECTED(error): samba4.drs.replica_sync.python(promoted_dc).replica_sync.DrsReplicaSyncTestCase.test_ReplConflictsRemoteWin(promoted_dc:local)
REASON: Exception: Exception: Traceback (most recent call last):
  File "/memdisk/autobuild/fl/b111074/samba/source4/torture/drs/python/replica_sync.py", line 200, in test_ReplConflictsRemoteWin
    self.ou2 = self._create_ou(self.ldb_dc2, "OU=Test Remote Conflict")
  File "/memdisk/autobuild/fl/b111074/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)
LdbError: (68, 'LDAP error 68 LDAP_ENTRY_ALREADY_EXISTS -  <Entry OU=Test Remote Conflict,OU=replica_sync8903285,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) -> 529
samba4.ldap.rodc_rwdc.python(rodc)(rodc:local) -> 452
samba4.drs.ridalloc_exop.python(vampire_dc)(vampire_dc) -> 323
samba4.ldap.confidential_attr.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 310
samba4.ldap.vlv.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 232
samba4.drs.replica_sync.python(vampire_dc)(vampire_dc:local) -> 229
samba4.rpc.samr.passwords.lockout on ncacn_np with (ad_dc_ntvfs) -> 225
samba4.rpc.samr.passwords.pwdlastset on ncacn_np with (ad_dc_ntvfs) -> 200
samba4.drs.samba_tool_drs.python(promoted_dc)(promoted_dc:local) -> 200
samba4.drs.samba_tool_drs.python(vampire_dc)(vampire_dc:local) -> 199
ERROR: test failed with exit code 1