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-144/2018-09-06-0904/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-144/2018-09-06-0904/samba.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-09-06-0904/samba.stdout
  
The top commit at the time of the failure was:

commit 05862b7bb0e62ba500b68cfc3403a85b00aa61dc
Author: Noel Power <noel.power at suse.com>
Date:   Thu May 10 13:16:28 2018 +0100

    s4/selftest: enable samba4.schemaInfo.python for py3
    
    Signed-off-by: Noel Power <noel.power at suse.com>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>
    
    Autobuild-User(master): Andrew Bartlett <abartlet at samba.org>
    Autobuild-Date(master): Thu Sep  6 02:27:51 CEST 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[792(4843)/848 at 1h43m0s] samba.tests.samba_tool.rodc(rodc:local)
[793(4852)/848 at 1h43m32s] samba.blackbox.rpcclient_samlogon(rodc:local)
[794(4856)/848 at 1h43m32s] samba.blackbox.rpcclient_samlogon_testallowed(rodc:local)
[795(4860)/848 at 1h43m33s] samba.blackbox.rpcclient_samlogon_testdenied(rodc:local)
[796(4864)/848 at 1h43m34s] samba4.drs.ridalloc_exop.python(vampire_dc)(vampire_dc)
[797(4875)/848 at 1h49m2s] samba4.drs.samba_tool_drs.python(vampire_dc)(vampire_dc:local)
[798(4889)/848 at 1h52m25s] samba4.drs.samba_tool_drs_showrepl.python(vampire_dc)(vampire_dc:local)
[799(4893)/848 at 1h52m33s] samba4.drs.replica_sync.python(vampire_dc)(vampire_dc:local)
[800(4909)/848 at 1h56m26s] samba4.drs.delete_object.python(vampire_dc)(vampire_dc)
[801(4911)/848 at 1h56m35s] samba4.drs.fsmo.python(vampire_dc)(vampire_dc)
[802(4916)/848 at 1h56m52s] samba4.drs.repl_move.python(vampire_dc)(vampire_dc)
[803(4937)/848 at 1h58m51s] samba4.drs.getnc_exop.python(vampire_dc)(vampire_dc)
[804(4949)/848 at 1h59m18s] samba4.drs.getnc_unpriv.python(vampire_dc)(vampire_dc)
[805(4953)/848 at 1h59m25s] samba4.drs.linked_attributes_drs.python(vampire_dc)(vampire_dc)
[806(4956)/848 at 1h59m27s] samba4.drs.link_conflicts.python(vampire_dc)(vampire_dc)
[807(4968)/848 at 2h8m24s] samba4.drs.samba_tool_drs.python(promoted_dc)(promoted_dc:local)
[808(4982)/848 at 2h16m31s] samba4.drs.samba_tool_drs_showrepl.python(promoted_dc)(promoted_dc:local)
[809(4986)/848 at 2h16m52s] samba4.drs.replica_sync.python(promoted_dc)(promoted_dc:local)
[810(5002)/848 at 2h27m12s] samba4.drs.delete_object.python(promoted_dc)(promoted_dc)
[811(5004)/848 at 2h27m37s] samba4.drs.fsmo.python(promoted_dc)(promoted_dc)
Testing for pdc role transfer from localdc.samba.example.com to promotedvdc.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/b1549827/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/b1549827/samba/source4/torture/drs/python/fsmo.py", line 104, in _role_transfer
    self._net_fsmo_role_transfer(DC=self.dnsname_dc2, role=role)
  File "/memdisk/autobuild/fl/b1549827/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.drs.replica_sync.python(promoted_dc)(promoted_dc:local) -> 620
samba4.drs.link_conflicts.python(vampire_dc)(vampire_dc) -> 537
samba4.ldap.rodc_rwdc.python(rodc)(rodc:local) -> 505
samba4.drs.samba_tool_drs.python(promoted_dc)(promoted_dc:local) -> 487
samba4.ldap.confidential_attr.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 333
samba4.drs.ridalloc_exop.python(vampire_dc)(vampire_dc) -> 327
samba4.ldap.vlv.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 325
samba4.drs.replica_sync.python(vampire_dc)(vampire_dc:local) -> 233
samba4.rpc.samr.passwords.lockout on ncacn_np with (ad_dc_ntvfs) -> 228
samba4.drs.samba_tool_drs.python(vampire_dc)(vampire_dc:local) -> 203
ERROR: test failed with exit code 1