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-144/2018-12-14-0100/flakey.log

The failure seems to be in the "samba-none-env" suite, whose build logs are available here:

   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-12-14-0100/samba-none-env.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-12-14-0100/samba-none-env.stdout
  
The top commit at the time of the failure was:

commit ecafdcb39143b6b3a74f2b9d578241a0170f8486
Author: Stefan Metzmacher <metze at samba.org>
Date:   Fri Dec 7 16:40:10 2018 +0100

    s3:pylibsmb: allow ImpersonationLevel argument to create()
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=7113
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=11892
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=13676
    
    Signed-off-by: Stefan Metzmacher <metze at samba.org>
    Reviewed-by: Tim Beale <timbeale at samba.org>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>
    
    Autobuild-User(master): Stefan Metzmacher <metze at samba.org>
    Autobuild-Date(master): Thu Dec 13 12:35:06 CET 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[182(3115)/218 at 20m52s] pidl.samba3-srv
[183(3116)/218 at 20m52s] pidl.tdr
[184(3122)/218 at 20m52s] pidl.test_util
[185(3128)/218 at 20m52s] pidl.typelist
[186(3184)/218 at 20m52s] pidl.util
[187(3256)/218 at 20m53s] pidl.wireshark-conf
[188(3305)/218 at 20m53s] pidl.wireshark-ndr
[189(3345)/218 at 20m53s] tdb.python
[190(3399)/218 at 20m53s] samba.tests.dsdb_lock
[191(3406)/218 at 22m8s] samba.tests.samba_tool.visualize
[192(3417)/218 at 22m12s] samba.tests.samba_tool.provision_password_check
[193(3421)/218 at 22m20s] samba.tests.samba_tool.help
[194(3422)/218 at 23m23s] samba.tests.domain_backup_offline
[195(3426)/218 at 24m55s] samba.tests.lsa_string
[196(3430)/218 at 24m55s] samba.tests.loadparm
[197(3433)/218 at 24m55s] samba4.blackbox.samba3dump
[198(3434)/218 at 24m56s] samba4.blackbox.upgrade
[199(3442)/218 at 25m28s] samba4.blackbox.provision.py
[200(3449)/218 at 26m28s] samba4.blackbox.supported_features
[201(3455)/218 at 26m41s] samba4.blackbox.start_backup
[202(3458)/218 at 26m53s] samba4.blackbox.upgradeprovision.current
[203(3465)/218 at 28m30s] samba4.blackbox.setpassword.py
[204(3471)/218 at 28m46s] samba4.blackbox.newuser.py
[205(3482)/218 at 29m5s] samba4.blackbox.group.py
[206(3511)/218 at 29m36s] samba4.blackbox.provision-backend
[207(3515)/218 at 29m49s] samba4.blackbox.renamedc.sh
[208(3526)/218 at 30m25s] samba4.dsdb.samdb.ldb_modules.unique_object_sids
[209(3532)/218 at 30m25s] samba4.dsdb.samdb.ldb_modules.encrypted_secrets.tdb
[210(3543)/218 at 30m26s] samba4.dsdb.samdb.ldb_modules.encrypted_secrets.mdb
[211(3554)/218 at 30m26s] lib.audit_logging.audit_logging
UNEXPECTED(failure): lib.audit_logging.audit_logging.test_audit_get_timestamp(none)
REASON: Exception: Exception: difftime(after, actual) >= 0
../../lib/audit_logging/tests/audit_logging_test.c:827: error: 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
samba.tests.docs -> 329
samba4.blackbox.upgradeprovision.alpha13 -> 146
samba4.blackbox.upgradeprovision.release-4-0-0 -> 134
samba4.blackbox.schemaupgrade -> 105
samba4.blackbox.upgradeprovision.current -> 97
samba.tests.domain_backup_offline -> 92
samba4.blackbox.dbcheck.release-4-1-0rc3 -> 77
samba4.blackbox.dbcheck.release-4-0-0 -> 77
samba.tests.dsdb_lock -> 75
samba.tests.samba_tool.help -> 63
ERROR: test failed with exit code 1