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-144/2018-12-14-1256/flakey.log

The failure seems to be in the "samba-py2" suite, whose build logs are available here:

   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-12-14-1256/samba-py2.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-12-14-1256/samba-py2.stdout
  
The top commit at the time of the failure was:

commit f183fd328314d90a92659720adebf034917962ec
Author: Brian Candler <b.candler at pobox.com>
Date:   Thu Dec 14 20:39:09 2017 +0000

    Change order of flags in Makefile so that crackcheck builds under Ubuntu
    
    Signed-off-by: Brian Candler <b.candler at pobox.com>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>
    Reviewed-by: Douglas Bagnall <douglas.bagnall at catalyst.net.nz>
    
    Autobuild-User(master): Andrew Bartlett <abartlet at samba.org>
    Autobuild-Date(master): Fri Dec 14 04:13:38 CET 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[21(180)/81 at 6m46s] samba.tests.dcerpc.registry.python2(ad_dc_ntvfs:local)
[22(183)/81 at 6m47s] samba.tests.dcerpc.dnsserver.python2(ad_dc_ntvfs)
[23(200)/81 at 7m26s] samba.tests.password_hash_fl2008.python2(ad_dc_ntvfs:local)
[24(204)/81 at 7m30s] samba.tests.encrypted_secrets.python2(vampire_dc:local)
[25(206)/81 at 8m50s] samba.tests.krb5_credentials.python2(ad_dc_ntvfs)
[26(209)/81 at 8m56s] samba.tests.py_credentials.python2(ad_dc_ntvfs)
[27(217)/81 at 9m8s] samba.tests.py_credentials.python2(vampire_dc)
[28(225)/81 at 9m15s] samba.tests.py_credentials.python2(promoted_dc)
[29(233)/81 at 10m48s] samba.tests.emulate.traffic.python2(ad_dc_ntvfs)
[30(235)/81 at 10m48s] samba.tests.emulate.traffic_packet.python2(ad_dc_ntvfs)
[31(324)/81 at 14m20s] samba.tests.blackbox.traffic_replay.python2(ad_dc_ntvfs)
[32(330)/81 at 15m2s] samba.tests.blackbox.traffic_learner.python2(ad_dc_ntvfs)
[33(332)/81 at 15m4s] samba.tests.blackbox.traffic_summary.python2(ad_dc_ntvfs)
[34(332)/81 at 15m4s] samba.tests.blackbox.smbcontrol.python2(ad_dc_ntvfs:local)
[35(334)/81 at 15m8s] samba.tests.blackbox.smbcontrol.python2(promoted_dc:local)
[36(336)/81 at 15m11s] samba4.schemaInfo.python(ad_dc_ntvfs).python2(ad_dc_ntvfs)
[37(338)/81 at 15m21s] samba.tests.dsdb_schema_attributes.python2(ad_dc_ntvfs:local)
[38(344)/81 at 16m7s] samba4.ldap.sort.python.python2(ad_dc_ntvfs)
[39(351)/81 at 16m26s] samba4.drs.replica_sync_rodc.python(rodc).python2(rodc:local)
[40(353)/81 at 18m8s] samba4.ldap.passwordsettings.python.python2(ad_dc_ntvfs)
[41(365)/81 at 19m49s] samba4.tombstone_reanimation.python.python2(ad_dc_ntvfs)
[42(377)/81 at 20m6s] samba.tests.upgradeprovisionneeddc.python2(ad_dc_ntvfs:local)
[43(388)/81 at 20m12s] samba.tests.samba_tool.rodc.python2(rodc:local)
[44(397)/81 at 21m32s] samba4.drs.ridalloc_exop.python(vampire_dc).python2(vampire_dc)
[45(408)/81 at 28m37s] samba4.drs.samba_tool_drs.python(vampire_dc).python2(vampire_dc:local)
UNEXPECTED(error): samba4.drs.samba_tool_drs.python(vampire_dc).python2.samba_tool_drs.SambaToolDrsTests.test_samba_tool_kcc(vampire_dc:local)
REASON: Exception: Exception: Traceback (most recent call last):
  File "/memdisk/autobuild/fl/b3005030/samba-py2/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 430, in check_output
    raise BlackboxProcessError(retcode, line, stdoutdata, stderrdata)
BlackboxProcessError: Command 'python3 /memdisk/autobuild/fl/b3005030/samba-py2/bin/samba-tool drs kcc localdc -USAMBADOMAIN/Administrator%locDCpass1'; shell True; 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.drs.ridalloc_exop.python(vampire_dc).python2(vampire_dc) -> 424
samba.tests.emulate.traffic_packet.python2(ad_dc_ntvfs) -> 211
samba4.ldap.passwordsettings.python.python2(ad_dc_ntvfs) -> 101
samba.tests.samba_tool.user.python2(ad_dc_ntvfs:local) -> 90
samba.tests.samba_tool.rodc.python2(rodc:local) -> 81
samba.tests.samba_tool.user_wdigest.python2(ad_dc_ntvfs:local) -> 57
samba.tests.samba_tool.passwordsettings.python2(ad_dc_ntvfs:local) -> 55
samba.tests.dsdb_schema_attributes.python2(ad_dc_ntvfs:local) -> 46
samba.tests.blackbox.traffic_replay.python2(ad_dc_ntvfs) -> 42
samba.tests.dcerpc.dnsserver.python2(ad_dc_ntvfs) -> 38
ERROR: test failed with exit code 1