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-144/2018-11-12-1304/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-144/2018-11-12-1304/samba-py3.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-11-12-1304/samba-py3.stdout
  
The top commit at the time of the failure was:

commit 899d00e6be5af48b93c15beb43f7383eeb8508b1
Author: Justin Stephenson <jstephen at redhat.com>
Date:   Thu Nov 8 10:57:48 2018 -0500

    s4-auth-tests: Fix test_kerberos with MIT krb
    
    When a keytab of type MEMORY is used, the MIT kerberos krb5_kt_add_entry()
    library function adds a keytab entry to the beginning of the keytab table,
    instead of the end.
    
    This adds a MIT kerberos conditional to reverse iterate through
    the keytable entries to address this.
    
    Signed-off-by: Justin Stephenson <jstephen at redhat.com>
    Reviewed-by: Andreas Schneider <asn at samba.org>
    Reviewed-by: Alexander Bokovoy <ab at samba.org>
    
    Autobuild-User(master): Alexander Bokovoy <ab at samba.org>
    Autobuild-Date(master): Sat Nov 10 12:48:02 CET 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[31(300)/77 at 10m51s] samba.tests.blackbox.traffic_learner.python3(ad_dc_ntvfs)
[32(302)/77 at 10m51s] samba.tests.blackbox.traffic_summary.python3(ad_dc_ntvfs)
[33(302)/77 at 10m52s] samba.tests.blackbox.smbcontrol.python3(ad_dc_ntvfs:local)
[34(304)/77 at 10m54s] samba.tests.blackbox.smbcontrol.python3(promoted_dc:local)
[35(306)/77 at 10m56s] samba4.schemaInfo.python(ad_dc_ntvfs).python3(ad_dc_ntvfs)
[36(308)/77 at 11m1s] samba.tests.dsdb_schema_attributes.python3(ad_dc_ntvfs:local)
[37(314)/77 at 11m19s] samba4.drs.replica_sync_rodc.python(rodc).python3(rodc:local)
[38(316)/77 at 12m17s] samba4.ldap.passwordsettings.python.python3(ad_dc_ntvfs)
[39(328)/77 at 13m12s] samba4.tombstone_reanimation.python.python3(ad_dc_ntvfs)
[40(340)/77 at 13m22s] samba.tests.upgradeprovisionneeddc.python3(ad_dc_ntvfs:local)
[41(351)/77 at 13m26s] samba.tests.samba_tool.rodc.python3(rodc:local)
[42(360)/77 at 14m12s] samba4.drs.ridalloc_exop.python(vampire_dc).python3(vampire_dc)
[43(371)/77 at 18m6s] samba4.drs.samba_tool_drs.python(vampire_dc).python3(vampire_dc:local)
[44(385)/77 at 20m32s] samba4.drs.samba_tool_drs_showrepl.python(vampire_dc).python3(vampire_dc:local)
[45(389)/77 at 20m53s] samba4.drs.replica_sync.python(vampire_dc).python3(vampire_dc:local)
[46(405)/77 at 22m49s] samba4.drs.delete_object.python(vampire_dc).python3(vampire_dc)
[47(407)/77 at 22m59s] samba4.drs.fsmo.python(vampire_dc).python3(vampire_dc)
[48(412)/77 at 23m13s] samba4.drs.repl_move.python(vampire_dc).python3(vampire_dc)
[49(433)/77 at 25m3s] samba4.drs.getnc_exop.python(vampire_dc).python3(vampire_dc)
[50(445)/77 at 25m14s] samba4.drs.getnc_unpriv.python(vampire_dc).python3(vampire_dc)
[51(449)/77 at 25m19s] samba4.drs.link_conflicts.python(vampire_dc).python3(vampire_dc)
[52(461)/77 at 29m39s] samba4.drs.samba_tool_drs.python(promoted_dc).python3(promoted_dc:local)
[53(475)/77 at 31m22s] samba4.drs.samba_tool_drs_showrepl.python(promoted_dc).python3(promoted_dc:local)
[54(479)/77 at 31m33s] 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_ReplConflictsRenamedVsNewRemoteWin(promoted_dc:local)
REASON: Exception: Exception: Traceback (most recent call last):
  File "/memdisk/autobuild/fl/b893554/samba-py3/source4/torture/drs/python/replica_sync.py", line 330, in test_ReplConflictsRenamedVsNewRemoteWin
    self.ou2 = self._create_ou(self.ldb_dc2, "OU=Test Remote Rename Conflict")
  File "/memdisk/autobuild/fl/b893554/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 Remote Rename Conflict,OU=replica_sync1730163,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) -> 260
samba4.drs.ridalloc_exop.python(vampire_dc).python3(vampire_dc) -> 234
samba4.drs.samba_tool_drs.python(vampire_dc).python3(vampire_dc:local) -> 146
samba.tests.emulate.traffic_packet.python3(ad_dc_ntvfs) -> 118
samba4.drs.replica_sync.python(vampire_dc).python3(vampire_dc:local) -> 116
samba4.drs.repl_move.python(vampire_dc).python3(vampire_dc) -> 110
samba4.drs.samba_tool_drs.python(promoted_dc).python3(promoted_dc:local) -> 103
samba.tests.samba_tool.user.python3(ad_dc_ntvfs:local) -> 89
samba.tests.samba_tool.user_wdigest.python3(ad_dc_ntvfs:local) -> 56
samba4.ldap.passwordsettings.python.python3(ad_dc_ntvfs) -> 55
ERROR: test failed with exit code 1