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-144/2018-12-01-1846/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-144/2018-12-01-1846/samba-py3.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-12-01-1846/samba-py3.stdout
  
The top commit at the time of the failure was:

commit 5b627edc55683417e7ac56d3aff7b7aa7cec5d92
Author: Gary Lockyer <gary at catalyst.net.nz>
Date:   Wed Sep 19 15:52:15 2018 +1200

    WHATSNEW: standard process limits
    
    Signed-off-by: Gary Lockyer <gary at catalyst.net.nz>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>
    
    Autobuild-User(master): Andrew Bartlett <abartlet at samba.org>
    Autobuild-Date(master): Fri Nov 30 15:05:04 CET 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[31(307)/79 at 8m4s] samba.tests.blackbox.traffic_learner.python3(ad_dc_ntvfs)
[32(309)/79 at 8m4s] samba.tests.blackbox.traffic_summary.python3(ad_dc_ntvfs)
[33(309)/79 at 8m5s] samba.tests.blackbox.smbcontrol.python3(ad_dc_ntvfs:local)
[34(311)/79 at 8m6s] samba.tests.blackbox.smbcontrol.python3(promoted_dc:local)
[35(313)/79 at 8m7s] samba4.schemaInfo.python(ad_dc_ntvfs).python3(ad_dc_ntvfs)
[36(315)/79 at 8m10s] samba.tests.dsdb_schema_attributes.python3(ad_dc_ntvfs:local)
[37(321)/79 at 8m24s] samba4.drs.replica_sync_rodc.python(rodc).python3(rodc:local)
[38(323)/79 at 9m12s] samba4.ldap.passwordsettings.python.python3(ad_dc_ntvfs)
[39(335)/79 at 9m59s] samba4.tombstone_reanimation.python.python3(ad_dc_ntvfs)
[40(347)/79 at 10m6s] samba.tests.upgradeprovisionneeddc.python3(ad_dc_ntvfs:local)
[41(358)/79 at 10m9s] samba.tests.samba_tool.rodc.python3(rodc:local)
[42(367)/79 at 10m43s] samba4.drs.ridalloc_exop.python(vampire_dc).python3(vampire_dc)
[43(378)/79 at 13m28s] samba4.drs.samba_tool_drs.python(vampire_dc).python3(vampire_dc:local)
[44(392)/79 at 15m11s] samba4.drs.samba_tool_drs_showrepl.python(vampire_dc).python3(vampire_dc:local)
[45(396)/79 at 15m23s] samba4.drs.replica_sync.python(vampire_dc).python3(vampire_dc:local)
[46(412)/79 at 16m45s] samba4.drs.delete_object.python(vampire_dc).python3(vampire_dc)
[47(414)/79 at 16m54s] samba4.drs.fsmo.python(vampire_dc).python3(vampire_dc)
[48(419)/79 at 17m5s] samba4.drs.repl_move.python(vampire_dc).python3(vampire_dc)
[49(440)/79 at 18m35s] samba4.drs.getnc_exop.python(vampire_dc).python3(vampire_dc)
[50(452)/79 at 18m45s] samba4.drs.getnc_unpriv.python(vampire_dc).python3(vampire_dc)
[51(456)/79 at 18m50s] samba4.drs.link_conflicts.python(vampire_dc).python3(vampire_dc)
[52(468)/79 at 22m2s] samba4.drs.samba_tool_drs.python(promoted_dc).python3(promoted_dc:local)
[53(482)/79 at 23m41s] samba4.drs.samba_tool_drs_showrepl.python(promoted_dc).python3(promoted_dc:local)
[54(486)/79 at 23m49s] samba4.drs.replica_sync.python(promoted_dc).python3(promoted_dc:local)
UNEXPECTED(error): samba4.drs.replica_sync.python(promoted_dc).python3.replica_sync.DrsReplicaSyncTestCase.test_ReplConflictsRemoteWin_with_child(promoted_dc:local)
REASON: Exception: Exception: Traceback (most recent call last):
  File "/memdisk/autobuild/fl/b614115/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/b614115/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_sync8874703,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).python3(vampire_dc) -> 192
samba4.drs.ridalloc_exop.python(vampire_dc).python3(vampire_dc) -> 164
samba4.drs.samba_tool_drs.python(vampire_dc).python3(vampire_dc:local) -> 103
samba4.drs.samba_tool_drs.python(promoted_dc).python3(promoted_dc:local) -> 98
samba.tests.emulate.traffic_packet.python3(ad_dc_ntvfs) -> 91
samba4.drs.repl_move.python(vampire_dc).python3(vampire_dc) -> 90
samba4.drs.replica_sync.python(vampire_dc).python3(vampire_dc:local) -> 82
samba.tests.samba_tool.user.python3(ad_dc_ntvfs:local) -> 66
samba4.ldap.passwordsettings.python.python3(ad_dc_ntvfs) -> 46
samba.tests.samba_tool.user_wdigest.python3(ad_dc_ntvfs:local) -> 40
ERROR: test failed with exit code 1