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-144/2018-12-06-0824/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-144/2018-12-06-0824/samba.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-12-06-0824/samba.stdout
  
The top commit at the time of the failure was:

commit 9aad13cbad06e753a79610996cbe64823f5eda35
Author: Ralph Boehme <slow at samba.org>
Date:   Mon Dec 3 11:23:28 2018 +0100

    WHATSNEW: document changes in SMB server parametric options
    
    Signed-off-by: Ralph Boehme <slow at samba.org>
    Reviewed-by: Jeremy Allison <jra at samba.org>
    
    Autobuild-User(master): Jeremy Allison <jra at samba.org>
    Autobuild-Date(master): Thu Dec  6 05:14:03 CET 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[786(4815)/854 at 1h27m35s] samba4.deletetest.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[787(4819)/854 at 1h27m37s] samba4.blackbox.spn.py(ad_dc_ntvfs:local)(ad_dc_ntvfs:local)
[788(4830)/854 at 1h27m42s] samba4.rpc.samr.large-dc.one(vampire_dc)
[789(4833)/854 at 1h27m50s] samba4.rpc.samr.large-dc.two(vampire_dc)
[790(4836)/854 at 1h27m59s] samba4.rpc.echo(rodc)
[791(4846)/854 at 1h28m2s] samba4.rpc.echo(rodc:local)
[792(4856)/854 at 1h28m6s] samba4.rpc.echo.testallowed(rodc:local)
[793(4866)/854 at 1h28m9s] samba4.rpc.echo.testdenied(rodc:local)
[794(4876)/854 at 1h28m13s] samba4.blackbox.smbclient(rodc:local)(rodc:local)
[795(4878)/854 at 1h28m14s] samba.tests.samba_tool.rodc(rodc:local)
[796(4887)/854 at 1h28m44s] samba.blackbox.rpcclient_samlogon(rodc:local)
[797(4891)/854 at 1h28m45s] samba.blackbox.rpcclient_samlogon_testallowed(rodc:local)
[798(4895)/854 at 1h28m46s] samba.blackbox.rpcclient_samlogon_testdenied(rodc:local)
[799(4899)/854 at 1h28m46s] samba4.drs.ridalloc_exop.python(vampire_dc)(vampire_dc)
[800(4910)/854 at 1h34m0s] samba4.drs.samba_tool_drs.python(vampire_dc)(vampire_dc:local)
[801(4924)/854 at 1h37m12s] samba4.drs.samba_tool_drs_showrepl.python(vampire_dc)(vampire_dc:local)
[802(4928)/854 at 1h37m23s] samba4.drs.replica_sync.python(vampire_dc)(vampire_dc:local)
[803(4944)/854 at 1h41m3s] samba4.drs.delete_object.python(vampire_dc)(vampire_dc)
[804(4946)/854 at 1h41m12s] samba4.drs.fsmo.python(vampire_dc)(vampire_dc)
[805(4951)/854 at 1h41m28s] samba4.drs.repl_move.python(vampire_dc)(vampire_dc)
[806(4972)/854 at 1h43m21s] samba4.drs.getnc_exop.python(vampire_dc)(vampire_dc)
[807(4984)/854 at 1h43m42s] samba4.drs.getnc_unpriv.python(vampire_dc)(vampire_dc)
[808(4988)/854 at 1h43m48s] samba4.drs.linked_attributes_drs.python(vampire_dc)(vampire_dc)
[809(4991)/854 at 1h43m50s] samba4.drs.link_conflicts.python(vampire_dc)(vampire_dc)
[810(5003)/854 at 1h49m9s] samba4.drs.samba_tool_drs.python(promoted_dc)(promoted_dc:local)
UNEXPECTED(error): samba4.drs.samba_tool_drs.python(promoted_dc).samba_tool_drs.SambaToolDrsTests.test_samba_tool_kcc(promoted_dc:local)
REASON: Exception: Exception: Traceback (most recent call last):
  File "/memdisk/autobuild/fl/b809371/samba/source4/torture/drs/python/samba_tool_drs.py", line 81, in test_samba_tool_kcc
    self.cmdline_creds))
  File "bin/python/samba/tests/__init__.py", line 425, in check_output
    raise BlackboxProcessError(retcode, line, stdoutdata, stderrdata)
BlackboxProcessError: Command '/memdisk/autobuild/fl/b809371/samba/bin/samba-tool drs kcc localdc -USAMBADOMAIN/Administrator%locDCpass1'; shell True; exit status 255; stdout: ''; stderr: 'ERROR(runtime): DsExecuteKCC failed - (3221225653, '{Device Timeout} The specified I/O operation on %hs was not completed before the time-out period expired.')
'

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) -> 446
samba4.drs.link_conflicts.python(vampire_dc)(vampire_dc) -> 320
samba4.ldap.confidential_attr.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 315
samba4.drs.ridalloc_exop.python(vampire_dc)(vampire_dc) -> 313
samba4.ldap.vlv.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 230
samba4.rpc.samr.passwords.lockout on ncacn_np with (ad_dc_ntvfs) -> 228
samba4.drs.replica_sync.python(vampire_dc)(vampire_dc:local) -> 220
samba4.rpc.samr.passwords.pwdlastset on ncacn_np with (ad_dc_ntvfs) -> 202
samba4.drs.samba_tool_drs.python(vampire_dc)(vampire_dc:local) -> 193
samba4.ldap.password_lockout.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 186
ERROR: test failed with exit code 1