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-144/2018-08-03-1344/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-144/2018-08-03-1344/samba.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-08-03-1344/samba.stdout
  
The top commit at the time of the failure was:

commit f7b2e5eec5ba1fa5f26694e6555a98cab0594a27
Author: Amitay Isaacs <amitay at gmail.com>
Date:   Tue Jul 31 17:44:25 2018 +1000

    ctdb-eventd: Fix CID 1438155
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=13554
    
    Signed-off-by: Amitay Isaacs <amitay at gmail.com>
    Reviewed-by: Volker Lendecke <vl at samba.org>
    
    Autobuild-User(master): Amitay Isaacs <amitay at samba.org>
    Autobuild-Date(master): Fri Aug  3 11:14:01 CEST 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[816(5042)/897 at 1h17m23s] samba4.rpc.echo(rodc:local)
[817(5052)/897 at 1h17m27s] samba4.rpc.echo.testallowed(rodc:local)
[818(5062)/897 at 1h17m30s] samba4.rpc.echo.testdenied(rodc:local)
[819(5072)/897 at 1h17m34s] samba4.blackbox.smbclient(rodc:local)(rodc:local)
[820(5074)/897 at 1h17m35s] samba4.rpc.echo(restoredc)
[821(5084)/897 at 1h17m38s] samba4.rpc.echo(restoredc:local)
[822(5094)/897 at 1h17m42s] samba4.rpc.echo.testallowed(restoredc:local)
[823(5104)/897 at 1h17m45s] samba4.rpc.echo.testdenied(restoredc:local)
[824(5114)/897 at 1h17m48s] samba4.blackbox.smbclient(restoredc:local)(restoredc:local)
[825(5116)/897 at 1h17m49s] samba4.rpc.echo(renamedc)
[826(5126)/897 at 1h17m52s] samba4.rpc.echo(renamedc:local)
[827(5136)/897 at 1h17m56s] samba4.rpc.echo.testallowed(renamedc:local)
[828(5146)/897 at 1h17m59s] samba4.rpc.echo.testdenied(renamedc:local)
[829(5156)/897 at 1h18m2s] samba4.blackbox.smbclient(renamedc:local)(renamedc:local)
[830(5158)/897 at 1h18m3s] samba4.rpc.echo(labdc)
[831(5168)/897 at 1h18m6s] samba4.rpc.echo(labdc:local)
[832(5178)/897 at 1h18m10s] samba4.rpc.echo.testallowed(labdc:local)
[833(5188)/897 at 1h18m10s] samba4.rpc.echo.testdenied(labdc:local)
[834(5198)/897 at 1h18m10s] samba4.blackbox.smbclient(labdc:local)(labdc:local)
[835(5200)/897 at 1h18m11s] samba.tests.samba_tool.rodc(rodc:local)
[836(5209)/897 at 1h18m41s] samba.blackbox.rpcclient_samlogon(rodc:local)
[837(5213)/897 at 1h18m41s] samba.blackbox.rpcclient_samlogon_testallowed(rodc:local)
[838(5217)/897 at 1h18m42s] samba.blackbox.rpcclient_samlogon_testdenied(rodc:local)
[839(5221)/897 at 1h18m43s] samba4.drs.ridalloc_exop.python(vampire_dc)(vampire_dc)
[840(5232)/897 at 1h23m59s] samba4.drs.samba_tool_drs.python(vampire_dc)(vampire_dc:local)
UNEXPECTED(error): samba4.drs.samba_tool_drs.python(vampire_dc).samba_tool_drs.SambaToolDrsTests.test_samba_tool_kcc(vampire_dc:local)
REASON: Exception: Exception: Traceback (most recent call last):
  File "/memdisk/autobuild/fl/b3559921/samba/source4/torture/drs/python/samba_tool_drs.py", line 80, in test_samba_tool_kcc
    self.cmdline_creds))
  File "bin/python/samba/tests/__init__.py", line 395, in check_output
    raise BlackboxProcessError(retcode, line, stdoutdata, stderrdata)
BlackboxProcessError: Command '/memdisk/autobuild/fl/b3559921/samba/bin/samba-tool drs kcc localdc -USAMBADOMAIN/Administrator%locDCpass1'; exit status 255; stdout: ''; stderr: 'ERROR(runtime): DsExecuteKCC failed - (3221356597, 'The operation cannot be performed.')
'

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.ldap.rodc_rwdc.python(rodc)(rodc:local) -> 450
samba4.drs.ridalloc_exop.python(vampire_dc)(vampire_dc) -> 317
samba4.ldap.vlv.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 233
samba4.rpc.samr.passwords.lockout on ncacn_np with (ad_dc_ntvfs) -> 225
samba4.rpc.samr.passwords.pwdlastset on ncacn_np with (ad_dc_ntvfs) -> 200
samba4.ldap.password_lockout.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 170
samba3.smbtorture_s3.vfs_aio_fork(simpleserver).RW2(simpleserver) -> 136
samba4.ldap.secdesc.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 113
samba4.raw.notify(ad_dc_ntvfs) -> 107
samba4.ldb.ldaps with options -U"$USERNAME%$PASSWORD"(ad_dc_ntvfs)(ad_dc_ntvfs) -> 102
ERROR: test failed with exit code 1