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-144/2018-11-18-0220/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-144/2018-11-18-0220/samba.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-11-18-0220/samba.stdout
  
The top commit at the time of the failure was:

commit be46a42774590f68f8560d82f8425a43fecda98b
Author: Christof Schmitt <cs at samba.org>
Date:   Wed Nov 14 15:13:03 2018 -0700

    smbtorture: Close unused pipe fds in kernel_oplocks8
    
    This fixes a hang of the testcase when hitting an error in the child (e.g.
    localdir does not exist)
    
    Signed-off-by: Christof Schmitt <cs at samba.org>
    Reviewed-by: Jeremy Allison <jra at samba.org>
    
    Autobuild-User(master): Jeremy Allison <jra at samba.org>
    Autobuild-Date(master): Fri Nov 16 21:52:13 CET 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[792(4836)/851 at 1h23m11s] samba4.rpc.echo.testdenied(rodc:local)
[793(4846)/851 at 1h23m14s] samba4.blackbox.smbclient(rodc:local)(rodc:local)
[794(4848)/851 at 1h23m15s] samba.tests.samba_tool.rodc(rodc:local)
[795(4857)/851 at 1h23m45s] samba.blackbox.rpcclient_samlogon(rodc:local)
[796(4861)/851 at 1h23m46s] samba.blackbox.rpcclient_samlogon_testallowed(rodc:local)
[797(4865)/851 at 1h23m46s] samba.blackbox.rpcclient_samlogon_testdenied(rodc:local)
[798(4869)/851 at 1h23m47s] samba4.drs.ridalloc_exop.python(vampire_dc)(vampire_dc)
[799(4880)/851 at 1h29m4s] samba4.drs.samba_tool_drs.python(vampire_dc)(vampire_dc:local)
[800(4894)/851 at 1h32m25s] samba4.drs.samba_tool_drs_showrepl.python(vampire_dc)(vampire_dc:local)
[801(4898)/851 at 1h32m36s] samba4.drs.replica_sync.python(vampire_dc)(vampire_dc:local)
[802(4914)/851 at 1h36m33s] samba4.drs.delete_object.python(vampire_dc)(vampire_dc)
[803(4916)/851 at 1h36m42s] samba4.drs.fsmo.python(vampire_dc)(vampire_dc)
[804(4921)/851 at 1h36m59s] samba4.drs.repl_move.python(vampire_dc)(vampire_dc)
[805(4942)/851 at 1h38m56s] samba4.drs.getnc_exop.python(vampire_dc)(vampire_dc)
[806(4954)/851 at 1h39m16s] samba4.drs.getnc_unpriv.python(vampire_dc)(vampire_dc)
[807(4958)/851 at 1h39m23s] samba4.drs.linked_attributes_drs.python(vampire_dc)(vampire_dc)
[808(4961)/851 at 1h39m25s] samba4.drs.link_conflicts.python(vampire_dc)(vampire_dc)
[809(4973)/851 at 1h46m54s] samba4.drs.samba_tool_drs.python(promoted_dc)(promoted_dc:local)
[810(4987)/851 at 1h50m18s] samba4.drs.samba_tool_drs_showrepl.python(promoted_dc)(promoted_dc:local)
[811(4991)/851 at 1h50m32s] samba4.drs.replica_sync.python(promoted_dc)(promoted_dc:local)
[812(5007)/851 at 1h54m19s] samba4.drs.delete_object.python(promoted_dc)(promoted_dc)
[813(5009)/851 at 1h54m29s] samba4.drs.fsmo.python(promoted_dc)(promoted_dc)
[814(5014)/851 at 1h54m45s] samba4.drs.repl_move.python(promoted_dc)(promoted_dc)
[815(5035)/851 at 1h57m34s] 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/b435634/samba/source4/torture/drs/python/getnc_exop.py", line 267, in test_link_utdv_hwm
    drsuapi.DRSUAPI_DRS_WRIT_REP)
  File "/memdisk/autobuild/fl/b435634/samba/source4/torture/drs/python/drs_base.py", line 364, in _check_replication
    dn_ordered=dn_ordered)
  File "/memdisk/autobuild/fl/b435634/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) -> 451
samba4.drs.link_conflicts.python(vampire_dc)(vampire_dc) -> 450
samba4.drs.ridalloc_exop.python(vampire_dc)(vampire_dc) -> 317
samba4.ldap.confidential_attr.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 312
samba4.drs.replica_sync.python(vampire_dc)(vampire_dc:local) -> 236
samba4.ldap.vlv.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 232
samba4.drs.replica_sync.python(promoted_dc)(promoted_dc:local) -> 227
samba4.rpc.samr.passwords.lockout on ncacn_np with (ad_dc_ntvfs) -> 226
samba4.drs.samba_tool_drs.python(promoted_dc)(promoted_dc:local) -> 203
samba4.rpc.samr.passwords.pwdlastset on ncacn_np with (ad_dc_ntvfs) -> 201
ERROR: test failed with exit code 1