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-184/2019-05-09-2152/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-184/2019-05-09-2152/samba-ad-dc-6.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-184/2019-05-09-2152/samba-ad-dc-6.stdout
  
The top commit at the time of the failure was:

commit 219bc189472acff24410009ee16a409e0aaf8eef
Author: Ralph Boehme <slow at samba.org>
Date:   Thu Apr 25 10:57:58 2019 +0200

    s3:smbd: don't use recvfile on streams
    
    Bug: https://bugzilla.samba.org/show_bug.cgi?id=13938
    
    Signed-off-by: Ralph Boehme <slow at samba.org>
    Reviewed-by: Jeremy Allison <jra at samba.org>
    
    Autobuild-User(master): Ralph Böhme <slow at samba.org>
    Autobuild-Date(master): Thu May  9 20:43:53 UTC 2019 on sn-devel-184

and the last 50 lines of the stdout log were:

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
badPwdCount = '3'
lockoutTime = '132019123018060080'
badPasswordTime = '132019123018060080'
logonCount = '4'
lastLogon = '132019122983651980'
lastLogonTimestamp = '132019122903155570'
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kerberos credentials (kerberos required): kinit for lockout1krb5 at SAMBA.EXAMPLE.COM failed (Clients credentials have been revoked)

Account locked out: kinit for lockout1krb5 at SAMBA.EXAMPLE.COM failed (Clients credentials have been revoked)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 = '132019123018060080'
badPasswordTime = '132019123018060080'
logonCount = '4'
lastLogon = '132019122983651980'
lastLogonTimestamp = '132019122903155570'
userAccountControl = '512'
msDS-User-Account-Control-Computed = '16'
UNEXPECTED(failure): samba4.ldap.password_lockout.python(ad_dc_slowtests).__main__.PasswordTestsWithSleep.test_pso_login_lockout_krb5(ad_dc_slowtests)
REASON: Exception: Exception: Traceback (most recent call last):
  File "/memdisk/autobuild/fl/b1778195/samba-ad-dc-6/source4/dsdb/tests/python/password_lockout.py", line 1172, in test_pso_login_lockout_krb5
    self._test_login_lockout(self.lockout1krb5_creds)
  File "/memdisk/autobuild/fl/b1778195/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) -> 583
samba4.ldap.confidential_attr.python(ad_dc_slowtests)(ad_dc_slowtests) -> 312
samba4.rpc.samr.passwords.lockout on ncacn_np with (ad_dc_slowtests) -> 238
samba4.rpc.samr.passwords.pwdlastset on ncacn_np with (ad_dc_slowtests) -> 208
samba4.rpc.samlogon on ncacn_np with (ad_dc_slowtests) -> 47
samba4.rpc.samr.passwords.badpwdcount on ncacn_np with (ad_dc_slowtests) -> 26
samba4.rpc.samr.passwords on ncacn_np with (ad_dc_slowtests) -> 20
samba4.rpc.samr.large-dc on ncacn_np with (ad_dc_slowtests) -> 14
samba4.rpc.samr.users on ncacn_np with (ad_dc_slowtests) -> 8
samba4.rpc.samr.users.privileges on ncacn_np with (ad_dc_slowtests) -> 4
ERROR: test failed with exit code 1
Makefile:16: recipe for target 'test' failed