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-184/2019-04-23-2208/flakey.log

The failure seems to be in the "samba-ad-dc-6" suite, whose build logs are available here:

   https://git.samba.org/autobuild.flakey.sn-devel-184/2019-04-23-2208/samba-ad-dc-6.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-184/2019-04-23-2208/samba-ad-dc-6.stdout
  
The top commit at the time of the failure was:

commit 76967b33ebb93a7ef5daa94b123ef9bfdce59ece
Author: Douglas Bagnall <douglas.bagnall at catalyst.net.nz>
Date:   Fri Apr 12 15:00:20 2019 +1200

    pyldb: avoid segfault when adding an element with no name
    
    We don't want to see this:
    
    python3 -c "import sys
    sys.path.insert(0, 'bin/python')
    import ldb
    m = ldb.Message()
    e = ldb.MessageElement('q')
    try:
        m.add(e)
    except ldb.LdbError:
        pass
    print(m)
    "
    Segmentation fault (core dumped)
    
    instead we want this:
    
    Traceback (most recent call last):
    File "<string>", line 7, in <module>
    ValueError: The element has no name
    
    Signed-off-by: Douglas Bagnall <douglas.bagnall at catalyst.net.nz>
    Reviewed-by: Noel Power <npower at samba.org>
    
    Autobuild-User(master): Noel Power <npower at samba.org>
    Autobuild-Date(master): Tue Apr 23 19:03:35 UTC 2019 on sn-devel-144

and the last 50 lines of the stdout log were:

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
badPwdCount = '3'
lockoutTime = '132005308599198350'
badPasswordTime = '132005308599198350'
logonCount = '4'
lastLogon = '132005308550076480'
lastLogonTimestamp = '132005308429268080'
userAccountControl = '512'
msDS-User-Account-Control-Computed = '16'
Failed to get kerberos credentials (kerberos required): kinit for lockout1krb5 at SAMBA.EXAMPLE.COM failed (Clients credentials have been revoked)

Account locked out: kinit for lockout1krb5 at SAMBA.EXAMPLE.COM failed (Clients credentials have been revoked)

gensec_spnego_create_negTokenInit_step: gssapi_krb5: creating NEG_TOKEN_INIT for ldap/localdc failed (next[(null)]): NT_STATUS_ACCOUNT_LOCKED_OUT
Failed to bind - LDAP client internal error: NT_STATUS_ACCOUNT_LOCKED_OUT
Failed to connect to 'ldap://localdc' with backend 'ldap': LDAP client internal error: NT_STATUS_ACCOUNT_LOCKED_OUT
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
badPwdCount = '3'
lockoutTime = '132005308599198350'
badPasswordTime = '132005308599198350'
logonCount = '4'
lastLogon = '132005308550076480'
lastLogonTimestamp = '132005308429268080'
userAccountControl = '512'
msDS-User-Account-Control-Computed = '16'
UNEXPECTED(failure): samba4.ldap.password_lockout.python(ad_dc_slowtests).__main__.PasswordTestsWithSleep.test_login_lockout_krb5(ad_dc_slowtests)
REASON: Exception: Exception: Traceback (most recent call last):
  File "/memdisk/autobuild/fl/b3956839/samba-ad-dc-6/source4/dsdb/tests/python/password_lockout.py", line 1163, in test_login_lockout_krb5
    self._test_login_lockout(self.lockout1krb5_creds)
  File "/memdisk/autobuild/fl/b3956839/samba-ad-dc-6/source4/dsdb/tests/python/password_lockout_base.py", line 549, in _test_login_lockout
    self.fail()
AssertionError: None

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.vlv.python(ad_dc_slowtests)(ad_dc_slowtests) -> 900
samba4.ldap.confidential_attr.python(ad_dc_slowtests)(ad_dc_slowtests) -> 539
samba4.rpc.samr.passwords.lockout on ncacn_np with (ad_dc_slowtests) -> 235
samba4.rpc.samr.passwords.pwdlastset on ncacn_np with (ad_dc_slowtests) -> 204
samba4.rpc.samlogon on ncacn_np with (ad_dc_slowtests) -> 39
samba4.rpc.samr.passwords.badpwdcount on ncacn_np with (ad_dc_slowtests) -> 21
samba4.rpc.samr.passwords on ncacn_np with (ad_dc_slowtests) -> 16
samba4.rpc.samr.large-dc on ncacn_np with (ad_dc_slowtests) -> 13
samba4.rpc.samr.users on ncacn_np with (ad_dc_slowtests) -> 6
samba4.rpc.samr on ncacn_np with (ad_dc_slowtests) -> 3
ERROR: test failed with exit code 1
Makefile:16: recipe for target 'test' failed