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-144/2018-11-11-0819/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-144/2018-11-11-0819/samba.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-11-11-0819/samba.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:

[792(4836)/851 at 1h22m20s] samba4.rpc.echo.testdenied(rodc:local)
[793(4846)/851 at 1h22m24s] samba4.blackbox.smbclient(rodc:local)(rodc:local)
[794(4848)/851 at 1h22m25s] samba.tests.samba_tool.rodc(rodc:local)
[795(4857)/851 at 1h22m55s] samba.blackbox.rpcclient_samlogon(rodc:local)
[796(4861)/851 at 1h22m56s] samba.blackbox.rpcclient_samlogon_testallowed(rodc:local)
[797(4865)/851 at 1h22m57s] samba.blackbox.rpcclient_samlogon_testdenied(rodc:local)
[798(4869)/851 at 1h22m57s] samba4.drs.ridalloc_exop.python(vampire_dc)(vampire_dc)
[799(4880)/851 at 1h28m18s] samba4.drs.samba_tool_drs.python(vampire_dc)(vampire_dc:local)
[800(4894)/851 at 1h31m41s] samba4.drs.samba_tool_drs_showrepl.python(vampire_dc)(vampire_dc:local)
[801(4898)/851 at 1h31m53s] samba4.drs.replica_sync.python(vampire_dc)(vampire_dc:local)
[802(4914)/851 at 1h35m39s] samba4.drs.delete_object.python(vampire_dc)(vampire_dc)
[803(4916)/851 at 1h35m48s] samba4.drs.fsmo.python(vampire_dc)(vampire_dc)
[804(4921)/851 at 1h36m4s] samba4.drs.repl_move.python(vampire_dc)(vampire_dc)
[805(4942)/851 at 1h37m59s] samba4.drs.getnc_exop.python(vampire_dc)(vampire_dc)
[806(4954)/851 at 1h38m19s] samba4.drs.getnc_unpriv.python(vampire_dc)(vampire_dc)
[807(4958)/851 at 1h38m25s] samba4.drs.linked_attributes_drs.python(vampire_dc)(vampire_dc)
[808(4961)/851 at 1h38m27s] samba4.drs.link_conflicts.python(vampire_dc)(vampire_dc)
[809(4973)/851 at 1h44m46s] samba4.drs.samba_tool_drs.python(promoted_dc)(promoted_dc:local)
[810(4987)/851 at 1h48m9s] samba4.drs.samba_tool_drs_showrepl.python(promoted_dc)(promoted_dc:local)
[811(4991)/851 at 1h48m23s] samba4.drs.replica_sync.python(promoted_dc)(promoted_dc:local)
[812(5007)/851 at 1h52m9s] samba4.drs.delete_object.python(promoted_dc)(promoted_dc)
[813(5009)/851 at 1h52m18s] samba4.drs.fsmo.python(promoted_dc)(promoted_dc)
[814(5014)/851 at 1h52m35s] samba4.drs.repl_move.python(promoted_dc)(promoted_dc)
[815(5035)/851 at 1h56m45s] samba4.drs.getnc_exop.python(promoted_dc)(promoted_dc)
UNEXPECTED(failure): samba4.drs.getnc_exop.python(promoted_dc).getnc_exop.DrsReplicaSyncTestCase.test_link_utdv_hwm(promoted_dc)
REASON: Exception: Exception: Traceback (most recent call last):
  File "/memdisk/autobuild/fl/b3772293/samba/source4/torture/drs/python/getnc_exop.py", line 267, in test_link_utdv_hwm
    drsuapi.DRSUAPI_DRS_WRIT_REP)
  File "/memdisk/autobuild/fl/b3772293/samba/source4/torture/drs/python/drs_base.py", line 364, in _check_replication
    dn_ordered=dn_ordered)
  File "/memdisk/autobuild/fl/b3772293/samba/source4/torture/drs/python/drs_base.py", line 387, in _check_ctr6
    self.assertEqual(ctr6.object_count, len(expected_dns))
AssertionError: 4 != 3

FAILED (1 failures, 0 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) -> 447
samba4.drs.link_conflicts.python(vampire_dc)(vampire_dc) -> 379
samba4.drs.ridalloc_exop.python(vampire_dc)(vampire_dc) -> 321
samba4.ldap.confidential_attr.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 307
samba4.drs.repl_move.python(promoted_dc)(promoted_dc) -> 249
samba4.ldap.vlv.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 233
samba4.drs.replica_sync.python(promoted_dc)(promoted_dc:local) -> 226
samba4.rpc.samr.passwords.lockout on ncacn_np with (ad_dc_ntvfs) -> 226
samba4.drs.replica_sync.python(vampire_dc)(vampire_dc:local) -> 226
samba4.drs.samba_tool_drs.python(vampire_dc)(vampire_dc:local) -> 203
ERROR: test failed with exit code 1