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-144/2018-12-06-2046/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-144/2018-12-06-2046/samba.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-12-06-2046/samba.stdout
  
The top commit at the time of the failure was:

commit 2f68c436cc857dd6c56ec75e03664388f5d1da2b
Author: Stefan Metzmacher <metze at samba.org>
Date:   Wed Dec 5 13:30:07 2018 +0100

    wscript_configure_system_mitkrb5: reject a system heimdal krb5-config
    
    Review with: git show -w
    
    Signed-off-by: Stefan Metzmacher <metze at samba.org>
    Reviewed-by: Andreas Schneider <asn at samba.org>
    
    Autobuild-User(master): Stefan Metzmacher <metze at samba.org>
    Autobuild-Date(master): Thu Dec  6 16:53:33 CET 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[796(4887)/854 at 1h39m40s] samba.blackbox.rpcclient_samlogon(rodc:local)
[797(4891)/854 at 1h39m40s] samba.blackbox.rpcclient_samlogon_testallowed(rodc:local)
[798(4895)/854 at 1h39m41s] samba.blackbox.rpcclient_samlogon_testdenied(rodc:local)
[799(4899)/854 at 1h39m42s] samba4.drs.ridalloc_exop.python(vampire_dc)(vampire_dc)
[800(4910)/854 at 1h45m19s] samba4.drs.samba_tool_drs.python(vampire_dc)(vampire_dc:local)
[801(4924)/854 at 1h48m38s] samba4.drs.samba_tool_drs_showrepl.python(vampire_dc)(vampire_dc:local)
[802(4928)/854 at 1h48m51s] samba4.drs.replica_sync.python(vampire_dc)(vampire_dc:local)
[803(4944)/854 at 1h53m10s] samba4.drs.delete_object.python(vampire_dc)(vampire_dc)
[804(4946)/854 at 1h53m24s] samba4.drs.fsmo.python(vampire_dc)(vampire_dc)
[805(4951)/854 at 1h53m46s] samba4.drs.repl_move.python(vampire_dc)(vampire_dc)
[806(4972)/854 at 1h58m44s] samba4.drs.getnc_exop.python(vampire_dc)(vampire_dc)
[807(4984)/854 at 1h59m20s] samba4.drs.getnc_unpriv.python(vampire_dc)(vampire_dc)
[808(4988)/854 at 1h59m32s] samba4.drs.linked_attributes_drs.python(vampire_dc)(vampire_dc)
[809(4991)/854 at 1h59m35s] samba4.drs.link_conflicts.python(vampire_dc)(vampire_dc)
[810(5003)/854 at 2h8m52s] samba4.drs.samba_tool_drs.python(promoted_dc)(promoted_dc:local)
[811(5017)/854 at 2h14m27s] samba4.drs.samba_tool_drs_showrepl.python(promoted_dc)(promoted_dc:local)
[812(5021)/854 at 2h14m48s] samba4.drs.replica_sync.python(promoted_dc)(promoted_dc:local)
[813(5037)/854 at 2h23m44s] samba4.drs.delete_object.python(promoted_dc)(promoted_dc)
[814(5039)/854 at 2h24m9s] samba4.drs.fsmo.python(promoted_dc)(promoted_dc)
Testing for pdc role transfer from localdc.samba.example.com to promotedvdc.samba.example.com
Testing for pdc role transfer from promotedvdc.samba.example.com to localdc.samba.example.com
UNEXPECTED(failure): samba4.drs.fsmo.python(promoted_dc).fsmo.DrsFsmoTestCase.test_PDCMasterTransfer(promoted_dc)
REASON: Exception: Exception: Traceback (most recent call last):
  File "/memdisk/autobuild/fl/b1827119/samba/source4/torture/drs/python/fsmo.py", line 139, in test_PDCMasterTransfer
    self._role_transfer(role="pdc", role_dn=self.domain_dn)
  File "/memdisk/autobuild/fl/b1827119/samba/source4/torture/drs/python/fsmo.py", line 114, in _role_transfer
    self._net_fsmo_role_transfer(DC=self.dnsname_dc1, role=role)
  File "/memdisk/autobuild/fl/b1827119/samba/source4/torture/drs/python/fsmo.py", line 70, in _net_fsmo_role_transfer
    self.assertCmdSuccess(result, out, err)
  File "bin/python/samba/tests/samba_tool/base.py", line 109, in assertCmdSuccess
    exit, out, err, msg))
AssertionError: exit[-1] stdout[] stderr[ERROR: Transfer of 'pdc' role failed: LDAP error 52 LDAP_UNAVAILABLE -  <Failed FSMO transfer: WERR_GEN_FAILURE> <>
]:

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) -> 600
samba4.drs.link_conflicts.python(vampire_dc)(vampire_dc) -> 557
samba4.drs.replica_sync.python(promoted_dc)(promoted_dc:local) -> 536
samba4.ldap.confidential_attr.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 416
samba4.ldap.vlv.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 358
samba4.drs.ridalloc_exop.python(vampire_dc)(vampire_dc) -> 337
samba4.drs.samba_tool_drs.python(promoted_dc)(promoted_dc:local) -> 335
samba4.drs.repl_move.python(vampire_dc)(vampire_dc) -> 298
samba4.drs.replica_sync.python(vampire_dc)(vampire_dc:local) -> 259
samba4.rpc.samr.passwords.lockout on ncacn_np with (ad_dc_ntvfs) -> 226
ERROR: test failed with exit code 1