autobuild[sn-devel-184]: intermittent test failure detected

[autobuild]

The autobuild test system (on sn-devel-184) 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-184/2019-06-09-0345/flakey.log

The failure seems to be in the "samba-ad-dc-2" suite, whose build logs are available here:

   https://git.samba.org/autobuild.flakey.sn-devel-184/2019-06-09-0345/samba-ad-dc-2.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-184/2019-06-09-0345/samba-ad-dc-2.stdout
  
The top commit at the time of the failure was:

commit 56400153c8c7052fe319f273c30c6d59556102dc
Author: Andrew Bartlett <abartlet at samba.org>
Date:   Fri May 31 12:47:13 2019 +1200

    Revert TestCaseInSubDir parts of "downgradedatabase: blackbox test"
    
    This reverts part of commit 74d15c9bf76f0a2fb5fa7b7b1d80971d10c4fe45.
    
    TestCaseInSubDir should not have been modified in this way, instead
    the downgradedatabase test should have removed the files it created
    specifically (this is part of the test, it shows the right files were
    created).
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=13978
    
    Signed-off-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 Jun  7 21:08:12 UTC 2019 on sn-devel-184

and the last 50 lines of the stdout log were:

[22(135)/67 at 1m41s] samba.wbinfo_simple.user-groups=$DOMAIN/$DC_USERNAME(rodc:local)
[23(136)/67 at 1m42s] samba.wbinfo_simple.authenticate=$DOMAIN/$DC_USERNAME%$DC_PASSWORD(rodc:local)
[24(137)/67 at 1m42s] samba.wbinfo_simple.allocate-uid(rodc:local)
[25(138)/67 at 1m42s] samba.wbinfo_simple.allocate-gid(rodc:local)
[26(139)/67 at 1m42s] samba.wbinfo_sids2xids.(rodc:local)(rodc:local)
[27(140)/67 at 1m57s] samba.tests.ntlm_auth(rodc:local)
[28(153)/67 at 2m2s] samba.tests.encrypted_secrets(vampire_dc:local)
[29(155)/67 at 2m3s] samba.tests.py_credentials(vampire_dc)
[30(163)/67 at 2m7s] samba4.ldap.large_ldap.gssapi.python(vampire_dc)(vampire_dc)
[31(166)/67 at 4m6s] samba4.ldap.rodc.python(rodc)(rodc)
[32(172)/67 at 4m8s] samba4.ldap.rodc_rwdc.python(rodc)(rodc:local)
[33(192)/67 at 12m25s] samba4.drs.replica_sync_rodc.python(rodc)(rodc:local)
[34(194)/67 at 12m32s] samba4.rpc.samr.large-dc.one(vampire_dc)
[35(197)/67 at 12m44s] samba4.rpc.samr.large-dc.two(vampire_dc)
[36(200)/67 at 12m57s] samba4.rpc.echo(rodc)
[37(210)/67 at 13m1s] samba4.rpc.echo(rodc:local)
[38(220)/67 at 13m5s] samba4.rpc.echo.testallowed(rodc:local)
[39(230)/67 at 13m9s] samba4.rpc.echo.testdenied(rodc:local)
[40(240)/67 at 13m12s] samba4.blackbox.smbclient(rodc:local)(rodc:local)
[41(242)/67 at 13m14s] samba.tests.samba_tool.rodc(rodc:local)
[42(251)/67 at 13m47s] samba.blackbox.rpcclient_samlogon(rodc:local)
[43(255)/67 at 13m48s] samba.blackbox.rpcclient_samlogon_testallowed(rodc:local)
[44(259)/67 at 13m49s] samba.blackbox.rpcclient_samlogon_testdenied(rodc:local)
[45(263)/67 at 13m50s] samba4.drs.ridalloc_exop.python(vampire_dc)(vampire_dc)
[46(274)/67 at 19m14s] 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/b2274007/samba-ad-dc-2/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 448, in check_output
    raise BlackboxProcessError(retcode, line, stdoutdata, stderrdata)
samba.tests.BlackboxProcessError: Command 'python3 /memdisk/autobuild/fl/b2274007/samba-ad-dc-2/bin/samba-tool drs kcc localdc -USAMBADOMAIN/Administrator%locDCpass1'; shell True; exit status 255; stdout: 'b'''; stderr: 'b"ERROR(runtime): DsExecuteKCC failed - (3221356597, 'The operation cannot be performed.')\n"'

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) -> 497
samba4.drs.ridalloc_exop.python(vampire_dc)(vampire_dc) -> 324
samba4.ldap.large_ldap.gssapi.python(vampire_dc)(vampire_dc) -> 119
samba.tests.samba_tool.rodc(rodc:local) -> 33
samba4.rpc.samr.large-dc.two(vampire_dc) -> 14
samba.wbinfo_sids2xids.(rodc:local)(rodc:local) -> 14
samba4.rpc.samr.large-dc.one(vampire_dc) -> 11
samba4.drs.replica_sync_rodc.python(rodc)(rodc:local) -> 8
samba.tests.dns(vampire_dc:local) -> 5
samba.tests.ntlm_auth(rodc:local) -> 5
ERROR: test failed with exit code 1
Makefile:16: recipe for target 'test' failed