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-144/2018-09-18-2035/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-144/2018-09-18-2035/samba.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-09-18-2035/samba.stdout
  
The top commit at the time of the failure was:

commit d0d1eafae9a9232b4a9314d854d56b98098e7f8e
Author: Martin Schwenke <martin at meltin.net>
Date:   Tue Sep 18 11:48:17 2018 +1000

    gitlab-ci: Correct the ctdb tasks
    
    They're swapped.
    
    Signed-off-by: Martin Schwenke <martin at meltin.net>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>
    
    Autobuild-User(master): Martin Schwenke <martins at samba.org>
    Autobuild-Date(master): Tue Sep 18 10:33:57 CEST 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[786(4798)/848 at 1h33m59s] samba4.rpc.samr.large-dc.two(vampire_dc)
[787(4801)/848 at 1h34m8s] samba4.rpc.echo(rodc)
[788(4811)/848 at 1h34m12s] samba4.rpc.echo(rodc:local)
[789(4821)/848 at 1h34m15s] samba4.rpc.echo.testallowed(rodc:local)
[790(4831)/848 at 1h34m19s] samba4.rpc.echo.testdenied(rodc:local)
[791(4841)/848 at 1h34m22s] samba4.blackbox.smbclient(rodc:local)(rodc:local)
[792(4843)/848 at 1h34m23s] samba.tests.samba_tool.rodc(rodc:local)
[793(4852)/848 at 1h34m55s] samba.blackbox.rpcclient_samlogon(rodc:local)
[794(4856)/848 at 1h34m56s] samba.blackbox.rpcclient_samlogon_testallowed(rodc:local)
[795(4860)/848 at 1h34m56s] samba.blackbox.rpcclient_samlogon_testdenied(rodc:local)
[796(4864)/848 at 1h34m57s] samba4.drs.ridalloc_exop.python(vampire_dc)(vampire_dc)
[797(4875)/848 at 1h40m18s] samba4.drs.samba_tool_drs.python(vampire_dc)(vampire_dc:local)
[798(4889)/848 at 1h43m36s] samba4.drs.samba_tool_drs_showrepl.python(vampire_dc)(vampire_dc:local)
[799(4893)/848 at 1h43m47s] samba4.drs.replica_sync.python(vampire_dc)(vampire_dc:local)
[800(4909)/848 at 1h47m35s] samba4.drs.delete_object.python(vampire_dc)(vampire_dc)
[801(4911)/848 at 1h47m44s] samba4.drs.fsmo.python(vampire_dc)(vampire_dc)
[802(4916)/848 at 1h48m1s] samba4.drs.repl_move.python(vampire_dc)(vampire_dc)
[803(4937)/848 at 1h49m55s] samba4.drs.getnc_exop.python(vampire_dc)(vampire_dc)
[804(4949)/848 at 1h50m16s] samba4.drs.getnc_unpriv.python(vampire_dc)(vampire_dc)
[805(4953)/848 at 1h50m23s] samba4.drs.linked_attributes_drs.python(vampire_dc)(vampire_dc)
[806(4956)/848 at 1h50m25s] samba4.drs.link_conflicts.python(vampire_dc)(vampire_dc)
[807(4968)/848 at 1h57m14s] samba4.drs.samba_tool_drs.python(promoted_dc)(promoted_dc:local)
[808(4982)/848 at 2h34s] samba4.drs.samba_tool_drs_showrepl.python(promoted_dc)(promoted_dc:local)
Good, failed as expected after 0 rounds: '/memdisk/autobuild/fl/b3806835/samba/bin/samba-tool drs showrepl --summary -v --color=yes promotedvdc -USAMBADOMAIN/Administrator%locDCpass1'
UNEXPECTED(failure): samba4.drs.samba_tool_drs_showrepl.python(promoted_dc).samba_tool_drs_showrepl.SambaToolDrsShowReplTests.test_samba_tool_showrepl_summary_forced_failure(promoted_dc:local)
REASON: Exception: Exception: Traceback (most recent call last):
  File "/memdisk/autobuild/fl/b3806835/samba/source4/torture/drs/python/samba_tool_drs_showrepl.py", line 325, in test_samba_tool_showrepl_summary_forced_failure
    e.cmd))
AssertionError: stdout: ''
stderr: 'ERROR(<type \'exceptions.IndexError\'>): uncaught exception - list index out of range\n  File "bin/python/samba/netcmd/__init__.py", line 183, in _run\n    return self.run(*args, **kwargs)\n  File "bin/python/samba/netcmd/drs.py", line 205, in run\n    return output_function()\n  File "bin/python/samba/netcmd/drs.py", line 251, in summary_output\n    return self.summary_output_handler("summary")\n  File "bin/python/samba/netcmd/drs.py", line 219, in summary_output_handler\n    local_data = self.get_local_repl_data()\n  File "bin/python/samba/netcmd/drs.py", line 300, in get_local_repl_data\n    d[\'dns name\'] = c_server_res[0]["dnsHostName"][0]\n'
retcode: 255
message: None
cmd: '/memdisk/autobuild/fl/b3806835/samba/bin/samba-tool drs showrepl --summary -v --color=yes promotedvdc -USAMBADOMAIN/Administrator%locDCpass1'

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) -> 489
samba4.drs.link_conflicts.python(vampire_dc)(vampire_dc) -> 409
samba4.ldap.vlv.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 324
samba4.drs.ridalloc_exop.python(vampire_dc)(vampire_dc) -> 321
samba4.ldap.confidential_attr.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 308
samba4.drs.replica_sync.python(vampire_dc)(vampire_dc:local) -> 227
samba4.rpc.samr.passwords.lockout on ncacn_np with (ad_dc_ntvfs) -> 226
samba4.rpc.samr.passwords.pwdlastset on ncacn_np with (ad_dc_ntvfs) -> 202
samba4.drs.samba_tool_drs.python(promoted_dc)(promoted_dc:local) -> 200
samba4.drs.samba_tool_drs.python(vampire_dc)(vampire_dc:local) -> 198
ERROR: test failed with exit code 1