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-144/2018-06-23-0129/flakey.log

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

   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-06-23-0129/samba.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-06-23-0129/samba.stdout
  
The top commit at the time of the failure was:

commit fb3ddb48741e9e9699cf6efab70192a45f49573e
Author: Swen Schillig <swen at vnet.ibm.com>
Date:   Wed Mar 7 14:40:33 2018 +0100

    ctdb-common: replace talloc / memcpy by talloc_memdup
    
    Signed-off-by: Swen Schillig <swen at vnet.ibm.com>
    Reviewed-by: Volker Lendecke <vl at samba.org>
    Reviewed-by: Martin Schwenke <martin at meltin.net>
    
    Autobuild-User(master): Martin Schwenke <martins at samba.org>
    Autobuild-Date(master): Fri Jun 22 11:57:19 CEST 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[745(3925)/855 at 55m59s] samba.tests.auth_log_netlogon_bad_creds(ad_dc_ntvfs:local)
[746(3929)/855 at 56m2s] samba.tests.password_hash_fl2008(ad_dc_ntvfs:local)
[747(3933)/855 at 56m6s] samba.tests.encrypted_secrets(vampire_dc:local)
[748(3935)/855 at 56m7s] samba.tests.lsa_string(ad_dc_ntvfs:local)
[749(3939)/855 at 56m7s] samba.tests.lsa_string.python3(ad_dc_ntvfs:local)
[750(3943)/855 at 56m8s] samba.tests.krb5_credentials(ad_dc_ntvfs)
[751(3946)/855 at 56m11s] samba.tests.krb5_credentials(ad_dc_ntvfs)
[752(3949)/855 at 56m15s] samba.tests.py_credentials(ad_dc_ntvfs)
[753(3957)/855 at 56m29s] samba.tests.py_credentials(vampire_dc)
[754(3965)/855 at 56m34s] samba.tests.py_credentials(promoted_dc)
[755(3973)/855 at 57m55s] samba.tests.emulate.traffic(ad_dc_ntvfs)
[756(3975)/855 at 57m55s] samba.tests.emulate.traffic_packet(ad_dc_ntvfs)
[757(4064)/855 at 1h1m1s] samba.tests.blackbox.traffic_replay(ad_dc_ntvfs)
[758(4070)/855 at 1h1m25s] samba.tests.blackbox.traffic_learner(ad_dc_ntvfs)
[759(4072)/855 at 1h1m26s] samba.tests.blackbox.traffic_summary(ad_dc_ntvfs)
[760(4072)/855 at 1h1m27s] samba.tests.blackbox.smbcontrol(ad_dc_ntvfs:local)
[761(4074)/855 at 1h1m32s] samba.tests.blackbox.smbcontrol(promoted_dc:local)
[762(4076)/855 at 1h1m35s] samba4.ldap.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[763(4115)/855 at 1h1m55s] samba4.tokengroups.krb5.python(ad_dc_ntvfs)(ad_dc_ntvfs:local)
[764(4125)/855 at 1h2m18s] samba4.tokengroups.ntlm.python(ad_dc_ntvfs)(ad_dc_ntvfs:local)
[765(4134)/855 at 1h2m39s] samba4.sam.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[766(4151)/855 at 1h2m50s] samba4.user_account_control.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[767(4162)/855 at 1h3m28s] samba4.schemaInfo.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[768(4164)/855 at 1h3m37s] samba.tests.dsdb_schema_attributes(ad_dc_ntvfs:local)
[769(4170)/855 at 1h4m12s] samba4.urgent_replication.python(ad_dc_ntvfs)(ad_dc_ntvfs:local)
[770(4178)/855 at 1h4m20s] samba4.ldap.dirsync.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[771(4202)/855 at 1h7m47s] samba4.ldap.match_rules.python(ad_dc_ntvfs)
[772(4236)/855 at 1h8m42s] samba4.ldap.notification.python(ad_dc_ntvfs)(ad_dc_ntvfs)
UNEXPECTED(failure): samba4.ldap.notification.python(ad_dc_ntvfs).__main__.LDAPNotificationTest.test_simple_search(ad_dc_ntvfs)
REASON: Exception: Exception: Traceback (most recent call last):
  File "/memdisk/autobuild/fl/b1088862/samba/source4/dsdb/tests/python/notification.py", line 150, in test_simple_search
    self.assertIsNotNone(msg3)
AssertionError: unexpectedly 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.rpc.samr.passwords.lockout on ncacn_np with (ad_dc_ntvfs) -> 225
samba4.ldap.dirsync.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 207
samba4.rpc.samr.passwords.pwdlastset on ncacn_np with (ad_dc_ntvfs) -> 200
samba.tests.emulate.traffic_packet(ad_dc_ntvfs) -> 186
samba3.smbtorture_s3.vfs_aio_fork(simpleserver).RW2(simpleserver) -> 137
samba.tests.samba_tool.user(ad_dc_ntvfs:local) -> 131
samba4.raw.notify(ad_dc_ntvfs) -> 107
samba4.ldb.ldaps with options -U"$USERNAME%$PASSWORD"(ad_dc_ntvfs)(ad_dc_ntvfs) -> 103
samba.tests.samba_tool.user_wdigest(ad_dc_ntvfs:local) -> 81
samba4.nbt.winsreplication(ad_dc_ntvfs) -> 61
ERROR: test failed with exit code 1