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-144/2018-11-28-1905/flakey.log

The failure seems to be in the "samba-py3" suite, whose build logs are available here:

   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-11-28-1905/samba-py3.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-11-28-1905/samba-py3.stdout
  
The top commit at the time of the failure was:

commit 8bde5ea169afa62e82fb2443877b4eef6f28fece
Author: Ralph Boehme <slow at samba.org>
Date:   Tue Nov 20 15:50:52 2018 +0100

    tfork: add a README how to run test torture test under valgrind
    
    Signed-off-by: Ralph Boehme <slow at samba.org>
    Reviewed-by: Stefan Metzmacher <metze at samba.org>
    
    Autobuild-User(master): Ralph Böhme <slow at samba.org>
    Autobuild-Date(master): Wed Nov 28 15:57:43 CET 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[22(177)/78 at 7m18s] samba.tests.password_hash_fl2008.python3(ad_dc_ntvfs:local)
[23(181)/78 at 7m21s] samba.tests.encrypted_secrets.python3(vampire_dc:local)
[24(183)/78 at 8m8s] samba.tests.krb5_credentials.python3(ad_dc_ntvfs)
[25(186)/78 at 8m11s] samba.tests.py_credentials.python3(ad_dc_ntvfs)
[26(194)/78 at 8m19s] samba.tests.py_credentials.python3(vampire_dc)
[27(202)/78 at 8m23s] samba.tests.py_credentials.python3(promoted_dc)
[28(210)/78 at 9m18s] samba.tests.emulate.traffic.python3(ad_dc_ntvfs)
[29(212)/78 at 9m19s] samba.tests.emulate.traffic_packet.python3(ad_dc_ntvfs)
[30(301)/78 at 11m24s] samba.tests.blackbox.traffic_replay.python3(ad_dc_ntvfs)
[31(307)/78 at 11m52s] samba.tests.blackbox.traffic_learner.python3(ad_dc_ntvfs)
[32(309)/78 at 11m54s] samba.tests.blackbox.traffic_summary.python3(ad_dc_ntvfs)
[33(309)/78 at 11m54s] samba.tests.blackbox.smbcontrol.python3(ad_dc_ntvfs:local)
[34(311)/78 at 11m56s] samba.tests.blackbox.smbcontrol.python3(promoted_dc:local)
[35(313)/78 at 11m58s] samba4.schemaInfo.python(ad_dc_ntvfs).python3(ad_dc_ntvfs)
[36(315)/78 at 12m3s] samba.tests.dsdb_schema_attributes.python3(ad_dc_ntvfs:local)
[37(321)/78 at 12m24s] samba4.drs.replica_sync_rodc.python(rodc).python3(rodc:local)
[38(323)/78 at 13m19s] samba4.ldap.passwordsettings.python.python3(ad_dc_ntvfs)
[39(335)/78 at 14m19s] samba4.tombstone_reanimation.python.python3(ad_dc_ntvfs)
[40(347)/78 at 14m30s] samba.tests.upgradeprovisionneeddc.python3(ad_dc_ntvfs:local)
[41(358)/78 at 14m34s] samba.tests.samba_tool.rodc.python3(rodc:local)
[42(367)/78 at 15m24s] samba4.drs.ridalloc_exop.python(vampire_dc).python3(vampire_dc)
[43(378)/78 at 18m51s] samba4.drs.samba_tool_drs.python(vampire_dc).python3(vampire_dc:local)
[44(392)/78 at 21m4s] samba4.drs.samba_tool_drs_showrepl.python(vampire_dc).python3(vampire_dc:local)
[45(396)/78 at 21m17s] samba4.drs.replica_sync.python(vampire_dc).python3(vampire_dc:local)
UNEXPECTED(error): samba4.drs.replica_sync.python(vampire_dc).python3.replica_sync.DrsReplicaSyncTestCase.test_ReplConflictsRemoteWin_with_child(vampire_dc:local)
REASON: Exception: Exception: Traceback (most recent call last):
  File "/memdisk/autobuild/fl/b1056920/samba-py3/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/b1056920/samba-py3/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_sync9223579,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.ridalloc_exop.python(vampire_dc).python3(vampire_dc) -> 207
samba4.drs.samba_tool_drs.python(vampire_dc).python3(vampire_dc:local) -> 134
samba.tests.emulate.traffic_packet.python3(ad_dc_ntvfs) -> 126
samba.tests.samba_tool.user.python3(ad_dc_ntvfs:local) -> 99
samba.tests.samba_tool.user_wdigest.python3(ad_dc_ntvfs:local) -> 66
samba4.ldap.passwordsettings.python.python3(ad_dc_ntvfs) -> 60
samba.tests.samba_tool.rodc.python3(rodc:local) -> 49
samba.tests.samba_tool.gpo.python3(ad_dc_ntvfs:local) -> 41
samba.tests.samba_tool.passwordsettings.python3(ad_dc_ntvfs:local) -> 38
samba.tests.samba_tool.computer.python3(ad_dc_ntvfs:local) -> 35
ERROR: test failed with exit code 1