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-144/2018-06-23-1347/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-144/2018-06-23-1347/samba.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-06-23-1347/samba.stdout
  
The top commit at the time of the failure was:

commit 05b54cc259645f69e14de2703724c284ed25838c
Author: Volker Lendecke <vl at samba.org>
Date:   Fri Jun 22 16:25:10 2018 +0200

    talloc_stack: Call talloc destructors while frame is still around
    
    This fixes "samba-tool ntacl set -d10"
    
    Signed-off-by: Volker Lendecke <vl at samba.org>
    Reviewed-by: Jeremy Allison <jra at samba.org>
    
    Autobuild-User(master): Jeremy Allison <jra at samba.org>
    Autobuild-Date(master): Sat Jun 23 04:56:44 CEST 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[757(4064)/855 at 49m34s] samba.tests.blackbox.traffic_replay(ad_dc_ntvfs)
[758(4070)/855 at 49m43s] samba.tests.blackbox.traffic_learner(ad_dc_ntvfs)
[759(4072)/855 at 49m44s] samba.tests.blackbox.traffic_summary(ad_dc_ntvfs)
[760(4072)/855 at 49m44s] samba.tests.blackbox.smbcontrol(ad_dc_ntvfs:local)
[761(4074)/855 at 49m46s] samba.tests.blackbox.smbcontrol(promoted_dc:local)
[762(4076)/855 at 49m47s] samba4.ldap.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[763(4115)/855 at 49m59s] samba4.tokengroups.krb5.python(ad_dc_ntvfs)(ad_dc_ntvfs:local)
[764(4125)/855 at 50m8s] samba4.tokengroups.ntlm.python(ad_dc_ntvfs)(ad_dc_ntvfs:local)
[765(4134)/855 at 50m17s] samba4.sam.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[766(4151)/855 at 50m21s] samba4.user_account_control.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[767(4162)/855 at 50m38s] samba4.schemaInfo.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[768(4164)/855 at 50m42s] samba.tests.dsdb_schema_attributes(ad_dc_ntvfs:local)
[769(4170)/855 at 50m58s] samba4.urgent_replication.python(ad_dc_ntvfs)(ad_dc_ntvfs:local)
[770(4178)/855 at 51m2s] samba4.ldap.dirsync.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[771(4202)/855 at 52m55s] samba4.ldap.match_rules.python(ad_dc_ntvfs)
[772(4236)/855 at 53m26s] samba4.ldap.notification.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[773(4239)/855 at 53m37s] samba4.ldap.sites.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[774(4250)/855 at 53m46s] samba4.ldap.sort.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[775(4257)/855 at 53m55s] samba4.ldap.vlv.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[776(4272)/855 at 1h26s] samba4.ldap.linked_attributes.python(ad_dc_ntvfs)(ad_dc_ntvfs:local)
[777(4292)/855 at 1h38s] samba4.ldap.rodc.python(rodc)(rodc)
[778(4298)/855 at 1h45s] samba4.ldap.rodc_rwdc.python(rodc)(rodc:local)
[779(4318)/855 at 1h12m6s] samba4.drs.replica_sync_rodc.python(rodc)(rodc:local)
[780(4320)/855 at 1h12m23s] samba4.ldap.password_settings.python(ad_dc_ntvfs)
[781(4332)/855 at 1h13m35s] 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_linkID(ad_dc_ntvfs)
REASON: Exception: Exception: Traceback (most recent call last):
  File "/memdisk/autobuild/fl/b1142023/samba/source4/dsdb/tests/python/ldap_schema.py", line 938, in test_generated_linkID
    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) -> 681
samba4.ldap.vlv.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 391
samba4.rpc.samr.passwords.lockout on ncacn_np with (ad_dc_ntvfs) -> 226
samba4.rpc.samr.passwords.pwdlastset on ncacn_np with (ad_dc_ntvfs) -> 199
samba3.smbtorture_s3.vfs_aio_fork(simpleserver).RW2(simpleserver) -> 138
samba4.ldap.dirsync.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 113
samba4.raw.notify(ad_dc_ntvfs) -> 107
samba4.ldb.ldaps with options -U"$USERNAME%$PASSWORD"(ad_dc_ntvfs)(ad_dc_ntvfs) -> 103
samba4.ldap.password_settings.python(ad_dc_ntvfs) -> 72
samba.tests.emulate.traffic_packet(ad_dc_ntvfs) -> 71
ERROR: test failed with exit code 1