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-144/2018-06-06-0131/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-144/2018-06-06-0131/samba.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-06-06-0131/samba.stdout
  
The top commit at the time of the failure was:

commit f2e8ab3f02aab7e2550409762800befa4b55cb69
Author: Martin Schwenke <martin at meltin.net>
Date:   Fri May 18 11:44:11 2018 +1000

    ctdb-tests: Continue running if a testcase is not executable
    
    Signed-off-by: Martin Schwenke <martin at meltin.net>
    Reviewed-by: Amitay Isaacs <amitay at gmail.com>
    
    Autobuild-User(master): Amitay Isaacs <amitay at samba.org>
    Autobuild-Date(master): Tue Jun  5 20:37:15 CEST 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[757(4064)/855 at 48m49s] samba.tests.blackbox.traffic_replay(ad_dc_ntvfs)
[758(4070)/855 at 48m59s] samba.tests.blackbox.traffic_learner(ad_dc_ntvfs)
[759(4072)/855 at 49m0s] samba.tests.blackbox.traffic_summary(ad_dc_ntvfs)
[760(4072)/855 at 49m0s] samba.tests.blackbox.smbcontrol(ad_dc_ntvfs:local)
[761(4074)/855 at 49m2s] samba.tests.blackbox.smbcontrol(promoted_dc:local)
[762(4076)/855 at 49m3s] samba4.ldap.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[763(4115)/855 at 49m14s] samba4.tokengroups.krb5.python(ad_dc_ntvfs)(ad_dc_ntvfs:local)
[764(4125)/855 at 49m23s] samba4.tokengroups.ntlm.python(ad_dc_ntvfs)(ad_dc_ntvfs:local)
[765(4134)/855 at 49m31s] samba4.sam.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[766(4151)/855 at 49m34s] samba4.user_account_control.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[767(4162)/855 at 49m47s] samba4.schemaInfo.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[768(4164)/855 at 49m50s] samba.tests.dsdb_schema_attributes(ad_dc_ntvfs:local)
[769(4170)/855 at 50m4s] samba4.urgent_replication.python(ad_dc_ntvfs)(ad_dc_ntvfs:local)
[770(4178)/855 at 50m6s] samba4.ldap.dirsync.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[771(4202)/855 at 51m37s] samba4.ldap.match_rules.python(ad_dc_ntvfs)
[772(4236)/855 at 51m53s] samba4.ldap.notification.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[773(4239)/855 at 52m5s] samba4.ldap.sites.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[774(4250)/855 at 52m11s] samba4.ldap.sort.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[775(4257)/855 at 52m16s] samba4.ldap.vlv.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[776(4272)/855 at 56m7s] samba4.ldap.linked_attributes.python(ad_dc_ntvfs)(ad_dc_ntvfs:local)
[777(4292)/855 at 56m12s] samba4.ldap.rodc.python(rodc)(rodc)
[778(4298)/855 at 56m16s] samba4.ldap.rodc_rwdc.python(rodc)(rodc:local)
[779(4318)/855 at 1h3m37s] samba4.drs.replica_sync_rodc.python(rodc)(rodc:local)
[780(4320)/855 at 1h3m46s] samba4.ldap.password_settings.python(ad_dc_ntvfs)
[781(4332)/855 at 1h4m23s] samba4.ldap_schema.python(ad_dc_ntvfs)(ad_dc_ntvfs)
GSS client Update(krb5)(1) Update failed:  Miscellaneous failure (see text): Clock skew too great
UNEXPECTED(error): samba4.ldap_schema.python(ad_dc_ntvfs).__main__.SchemaTests.test_generated_mAPIID(ad_dc_ntvfs)
REASON: Exception: Exception: Traceback (most recent call last):
  File "/memdisk/autobuild/fl/b2456117/samba/source4/dsdb/tests/python/ldap_schema.py", line 1173, in test_generated_mAPIID
    self.ldb.modify_ldif(ldif)
  File "bin/python/samba/__init__.py", line 241, in modify_ldif
    self.modify(msg, controls)
LdbError: (3, 'ldb_wait from (null) with LDB_WAIT_ALL: Time limit exceeded (3)')

FAILED (0 failures, 1 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.rodc_rwdc.python(rodc)(rodc:local) -> 441
samba4.ldap.vlv.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 232
samba4.rpc.samr.passwords.lockout on ncacn_np with (ad_dc_ntvfs) -> 225
samba4.rpc.samr.passwords.pwdlastset on ncacn_np with (ad_dc_ntvfs) -> 199
samba3.smbtorture_s3.vfs_aio_fork(simpleserver).RW2(simpleserver) -> 136
samba4.raw.notify(ad_dc_ntvfs) -> 105
samba4.ldb.ldaps with options -U"$USERNAME%$PASSWORD"(ad_dc_ntvfs)(ad_dc_ntvfs) -> 101
samba4.ldap.dirsync.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 91
samba.tests.emulate.traffic_packet(ad_dc_ntvfs) -> 68
samba.tests.samba_tool.user(ad_dc_ntvfs:local) -> 66
ERROR: test failed with exit code 1