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-144/2019-04-03-0040/flakey.log

The failure seems to be in the "samba-ad-dc-5" suite, whose build logs are available here:

   https://git.samba.org/autobuild.flakey.sn-devel-144/2019-04-03-0040/samba-ad-dc-5.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2019-04-03-0040/samba-ad-dc-5.stdout
  
The top commit at the time of the failure was:

commit 47278bfaa6dec543be49c0d66a2418928356a4a3
Author: Michael Hanselmann <public at hansmi.ch>
Date:   Sat Mar 23 00:14:52 2019 +0100

    waf: Simplify condition for undefined symbol detection
    
    There's no need to check for OpenBSD twice.
    
    Signed-off-by: Michael Hanselmann <public at hansmi.ch>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>
    Reviewed-by: Noel Power <npower at samba.org>
    
    Autobuild-User(master): Noel Power <npower at samba.org>
    Autobuild-Date(master): Tue Apr  2 17:28:40 UTC 2019 on sn-devel-144

and the last 50 lines of the stdout log were:

[288(1717)/320 at 17m10s] samba4.ntp.signd(ad_dc_default:local)
[289(1718)/320 at 17m12s] samba4.dns_internal.queryself(ad_dc_default:local)
[290(1719)/320 at 17m12s] samba4.dns_internal.updateself(ad_dc_default:local)
[291(1720)/320 at 17m12s] samba4.blackbox.samba_tool(ad_dc_default:local)(ad_dc_default:local)
[292(1726)/320 at 17m16s] samba.tests.gensec(ad_dc_default:local)
[293(1737)/320 at 17m18s] samba.tests.dcerpc.sam(ad_dc_default:local)
[294(1750)/320 at 17m23s] samba.tests.dsdb(ad_dc_default:local)
[295(1777)/320 at 17m33s] samba.tests.dcerpc.bare(ad_dc_default:local)
[296(1781)/320 at 17m33s] samba.tests.dcerpc.srvsvc(ad_dc_default:local)
[297(1781)/320 at 17m33s] samba.tests.samba_tool.timecmd(ad_dc_default:local)
[298(1783)/320 at 17m37s] samba.tests.samba_tool.join(ad_dc_default:local)
[299(1784)/320 at 17m39s] samba.tests.samba_tool.processes(ad_dc_default:local)
[300(1787)/320 at 17m39s] samba.tests.samba_tool.user(ad_dc_default:local)
[301(1794)/320 at 19m13s] samba.tests.samba_tool.user_wdigest(ad_dc_default:local)
WARNING: The "lsa over netlogon" option is deprecated
WARNING: The "server schannel" option is deprecated
WARNING: The "lsa over netlogon" option is deprecated
WARNING: The "server schannel" option is deprecated
WARNING: The "lsa over netlogon" option is deprecated
WARNING: The "server schannel" option is deprecated
WARNING: The "lsa over netlogon" option is deprecated
WARNING: The "server schannel" option is deprecated
WARNING: The "lsa over netlogon" option is deprecated
WARNING: The "server schannel" option is deprecated
UNEXPECTED(failure): samba.tests.samba_tool.user_wdigest.samba.tests.samba_tool.user_wdigest.UserCmdWdigestTestCase.test_Wdigest01(ad_dc_default:local)
REASON: Exception: Exception: Traceback (most recent call last):
  File "/memdisk/autobuild/fl/b2056950/samba-ad-dc-5/bin/python/samba/tests/samba_tool/user_wdigest.py", line 137, in test_Wdigest01
    self._testWDigest(attribute, expected)
  File "/memdisk/autobuild/fl/b2056950/samba-ad-dc-5/bin/python/samba/tests/samba_tool/user_wdigest.py", line 114, in _testWDigest
    "%s: %s" % (attribute, expected))
  File "/memdisk/autobuild/fl/b2056950/samba-ad-dc-5/bin/python/samba/tests/samba_tool/base.py", line 119, in assertMatch
    self.assertIn(string, base, msg)
AssertionError: 'virtualWDigest01: WdigestTestUser:SAMBADOMAIN:9b16a85c29a13a9918a2094ea3db91e3' not found in 'dn: CN=WdigestTestUser,CN=Users,DC=samba,DC=example,DC=com\n\nGot password OK\n' : 'virtualWDigest01: WdigestTestUser:SAMBADOMAIN:9b16a85c29a13a9918a2094ea3db91e3' is not in 'dn: CN=WdigestTestUser,CN=Users,DC=samba,DC=example,DC=com\n\nGot password OK\n'

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.ldb.ldaps with options -U"$USERNAME%$PASSWORD"(ad_dc_default)(ad_dc_default) -> 130
samba.tests.samba_tool.user(ad_dc_default:local) -> 93
samba4.drs.rpc.dssync on ncacn_ip_tcp with validate(ad_dc_default) -> 38
samba4.drs.rpc.msDSIntId on ncacn_ip_tcp with validate(ad_dc_default) -> 31
samba4.rpc.lsa.trusted.domains with bigendian(ad_dc_default) -> 26
samba4.ldb.ldap with options '-U"$USERNAME%$PASSWORD" -k yes --option=clientldapsaslwrapping=plain'(ad_dc_default)(ad_dc_default) -> 25
samba4.ldb.ldap with options '-U"$USERNAME%$PASSWORD"  --option=clientldapsaslwrapping=plain'(ad_dc_default)(ad_dc_default) -> 25
samba4.rpc.schannel on ncacn_np with bigendian(ad_dc_default) -> 24
samba4.rpc.schannel on ncacn_ip_tcp with validate(ad_dc_default) -> 24
samba4.rpc.schannel on ncacn_np with seal,padcheck(ad_dc_default) -> 23
ERROR: test failed with exit code 1