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-144/2018-07-12-0809/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-144/2018-07-12-0809/samba.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-07-12-0809/samba.stdout
  
The top commit at the time of the failure was:

commit e186d6a06b1b300256a2cb4138f0532d518d0597
Author: Stefan Metzmacher <metze at samba.org>
Date:   Fri May 18 16:28:47 2018 +0200

    s4:messaging: make sure only imessaging_client_init() can be used with a wrapper tevent_context wrapper
    
    imessaging_client_init() can be used with a wrapper tevent_context,
    but only if a global messaging_dgm_ref() already exist.
    
    All other uses of imessaging_init() and imessaging_client_init()
    require a raw tevent_context.
    
    Signed-off-by: Stefan Metzmacher <metze at samba.org>
    Reviewed-by: Ralph Boehme <slow at samba.org>
    
    Autobuild-User(master): Ralph Böhme <slow at samba.org>
    Autobuild-Date(master): Thu Jul 12 02:23:37 CEST 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[814(4964)/886 at 1h16m30s] samba4.rpc.echo(renamedc)
[815(4974)/886 at 1h16m33s] samba4.rpc.echo(renamedc:local)
[816(4984)/886 at 1h16m37s] samba4.rpc.echo.testallowed(renamedc:local)
[817(4994)/886 at 1h16m40s] samba4.rpc.echo.testdenied(renamedc:local)
[818(5004)/886 at 1h16m43s] samba4.blackbox.smbclient(renamedc:local)(renamedc:local)
[819(5006)/886 at 1h16m44s] samba4.rpc.echo(labdc)
[820(5016)/886 at 1h16m47s] samba4.rpc.echo(labdc:local)
[821(5026)/886 at 1h16m51s] samba4.rpc.echo.testallowed(labdc:local)
[822(5036)/886 at 1h16m51s] samba4.rpc.echo.testdenied(labdc:local)
[823(5046)/886 at 1h16m51s] samba4.blackbox.smbclient(labdc:local)(labdc:local)
[824(5048)/886 at 1h16m52s] samba.tests.samba_tool.rodc(rodc:local)
[825(5057)/886 at 1h17m20s] samba.blackbox.rpcclient_samlogon(rodc:local)
[826(5061)/886 at 1h17m21s] samba.blackbox.rpcclient_samlogon_testallowed(rodc:local)
[827(5065)/886 at 1h17m22s] samba.blackbox.rpcclient_samlogon_testdenied(rodc:local)
[828(5069)/886 at 1h17m22s] samba4.drs.ridalloc_exop.python(vampire_dc)(vampire_dc)
[829(5080)/886 at 1h22m29s] samba4.drs.samba_tool_drs.python(vampire_dc)(vampire_dc:local)
[830(5094)/886 at 1h25m40s] samba4.drs.samba_tool_drs_showrepl.python(vampire_dc)(vampire_dc:local)
[831(5098)/886 at 1h25m52s] samba4.drs.replica_sync.python(vampire_dc)(vampire_dc:local)
[832(5114)/886 at 1h29m37s] samba4.drs.delete_object.python(vampire_dc)(vampire_dc)
[833(5116)/886 at 1h29m46s] samba4.drs.fsmo.python(vampire_dc)(vampire_dc)
[834(5121)/886 at 1h30m3s] samba4.drs.repl_move.python(vampire_dc)(vampire_dc)
[835(5142)/886 at 1h32m34s] samba4.drs.getnc_exop.python(vampire_dc)(vampire_dc)
[836(5154)/886 at 1h32m59s] samba4.drs.getnc_unpriv.python(vampire_dc)(vampire_dc)
[837(5158)/886 at 1h33m6s] samba4.drs.linked_attributes_drs.python(vampire_dc)(vampire_dc)
[838(5161)/886 at 1h33m8s] samba4.drs.link_conflicts.python(vampire_dc)(vampire_dc)
[839(5173)/886 at 1h42m43s] samba4.drs.samba_tool_drs.python(promoted_dc)(promoted_dc:local)
[840(5187)/886 at 1h48m49s] samba4.drs.samba_tool_drs_showrepl.python(promoted_dc)(promoted_dc:local)
Good, failed as expected after 0 rounds: '/memdisk/autobuild/fl/b3970189/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/b3970189/samba/source4/torture/drs/python/samba_tool_drs_showrepl.py", line 314, in test_samba_tool_showrepl_summary_forced_failure
    self.assertIn('There are failing connections', e.stdout)
AssertionError: 'There are failing connections' not found in ''

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.drs.link_conflicts.python(vampire_dc)(vampire_dc) -> 575
samba4.ldap.rodc_rwdc.python(rodc)(rodc:local) -> 436
samba4.drs.samba_tool_drs.python(promoted_dc)(promoted_dc:local) -> 366
samba4.drs.ridalloc_exop.python(vampire_dc)(vampire_dc) -> 307
samba4.ldap.vlv.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 230
samba4.rpc.samr.passwords.lockout on ncacn_np with (ad_dc_ntvfs) -> 225
samba4.drs.replica_sync.python(vampire_dc)(vampire_dc:local) -> 224
samba4.rpc.samr.passwords.pwdlastset on ncacn_np with (ad_dc_ntvfs) -> 201
samba4.drs.samba_tool_drs.python(vampire_dc)(vampire_dc:local) -> 191
samba4.ldap.password_lockout.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 166
ERROR: test failed with exit code 1