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-184/2019-04-26-0356/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-184/2019-04-26-0356/samba-none-env.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-184/2019-04-26-0356/samba-none-env.stdout
  
The top commit at the time of the failure was:

commit b50ca162733b097cd16d346525dde2e1fef2d656
Author: Andreas Schneider <asn at samba.org>
Date:   Thu Apr 25 08:05:56 2019 +0200

    gitlab-ci: Remove Ubuntu 14.04
    
    Ubuntu 14.04 a compiler which complains about valid C99 code and also it
    doesn't offer GnuTLS >= 3.2 which we require to move to GnuTLS.
    
    Signed-off-by: Andreas Schneider <asn at samba.org>
    Reviewed-by: Ralph Boehme <slow at samba.org>
    
    Autobuild-User(master): Andreas Schneider <asn at cryptomilk.org>
    Autobuild-Date(master): Thu Apr 25 16:52:57 UTC 2019 on sn-devel-184

and the last 50 lines of the stdout log were:

[196(3296)/231 at 29m45s] pidl.typelist
[197(3352)/231 at 29m45s] pidl.util
[198(3424)/231 at 29m46s] pidl.wireshark-conf
[199(3473)/231 at 29m46s] pidl.wireshark-ndr
[200(3513)/231 at 29m46s] tdb.python
[201(3567)/231 at 29m46s] samba.tests.dsdb_lock
[202(3574)/231 at 30m58s] samba.tests.samba_tool.visualize
[203(3585)/231 at 31m2s] samba.tests.samba_tool.provision_password_check
[204(3589)/231 at 31m10s] samba.tests.samba_tool.help
[205(3590)/231 at 32m12s] samba.tests.domain_backup_offline
[206(3594)/231 at 33m34s] samba.tests.lsa_string
[207(3598)/231 at 33m34s] samba.tests.loadparm
[208(3601)/231 at 33m34s] samba4.ldap.index.python
[209(3605)/231 at 33m35s] samba4.blackbox.samba3dump
[210(3606)/231 at 33m35s] samba4.blackbox.upgrade
[211(3614)/231 at 34m2s] samba4.blackbox.provision.py
[212(3621)/231 at 34m49s] samba4.blackbox.provision_fileperms
[213(3623)/231 at 34m58s] samba4.blackbox.supported_features
[214(3629)/231 at 35m6s] samba4.blackbox.start_backup
[215(3632)/231 at 35m15s] samba4.blackbox.upgradeprovision.current
[216(3639)/231 at 36m18s] samba4.blackbox.setpassword.py
[217(3645)/231 at 36m29s] samba4.blackbox.newuser.py
[218(3656)/231 at 36m41s] samba4.blackbox.group.py
[219(3685)/231 at 37m2s] samba4.blackbox.provision-backend
[220(3689)/231 at 37m10s] samba4.blackbox.renamedc.sh
[221(3700)/231 at 37m31s] samba4.dsdb.samdb.ldb_modules.unique_object_sids
[222(3706)/231 at 37m31s] samba4.dsdb.samdb.ldb_modules.encrypted_secrets.tdb
[223(3721)/231 at 37m31s] samba4.dsdb.samdb.ldb_modules.encrypted_secrets.mdb
[224(3736)/231 at 37m31s] 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 -> 432
samba4.blackbox.upgradeprovision.alpha13 -> 149
samba4.blackbox.upgradeprovision.release-4-0-0 -> 132
samba4.blackbox.dbcheck.release-4-0-0 -> 97
samba4.blackbox.schemaupgrade -> 96
samba4.blackbox.dbcheck.release-4-1-0rc3.quick -> 95
samba4.blackbox.dbcheck.release-4-1-0rc3 -> 93
samba4.blackbox.dbcheck.release-4-0-0.quick -> 89
samba.tests.domain_backup_offline -> 82
samba4.blackbox.dbcheck.alpha13.quick -> 73
ERROR: test failed with exit code 1
Makefile:16: recipe for target 'test' failed