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-144/2018-12-01-1338/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-144/2018-12-01-1338/samba.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-12-01-1338/samba.stdout
  
The top commit at the time of the failure was:

commit 5b627edc55683417e7ac56d3aff7b7aa7cec5d92
Author: Gary Lockyer <gary at catalyst.net.nz>
Date:   Wed Sep 19 15:52:15 2018 +1200

    WHATSNEW: standard process limits
    
    Signed-off-by: Gary Lockyer <gary at catalyst.net.nz>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>
    
    Autobuild-User(master): Andrew Bartlett <abartlet at samba.org>
    Autobuild-Date(master): Fri Nov 30 15:05:04 CET 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[753(4051)/854 at 54m18s] samba.tests.blackbox.traffic_replay(ad_dc_ntvfs)
[754(4057)/854 at 54m30s] samba.tests.blackbox.traffic_learner(ad_dc_ntvfs)
[755(4059)/854 at 54m30s] samba.tests.blackbox.traffic_summary(ad_dc_ntvfs)
[756(4059)/854 at 54m30s] samba.tests.blackbox.smbcontrol(ad_dc_ntvfs:local)
[757(4061)/854 at 54m31s] samba.tests.blackbox.smbcontrol(promoted_dc:local)
[758(4063)/854 at 54m32s] samba4.ldap.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[759(4102)/854 at 54m44s] samba4.tokengroups.krb5.python(ad_dc_ntvfs)(ad_dc_ntvfs:local)
[760(4112)/854 at 54m53s] samba4.tokengroups.ntlm.python(ad_dc_ntvfs)(ad_dc_ntvfs:local)
[761(4121)/854 at 55m1s] samba4.sam.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[762(4138)/854 at 55m4s] samba4.user_account_control.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[763(4149)/854 at 55m18s] samba4.schemaInfo.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[764(4151)/854 at 55m20s] samba.tests.dsdb_schema_attributes(ad_dc_ntvfs:local)
[765(4157)/854 at 55m34s] samba4.urgent_replication.python(ad_dc_ntvfs)(ad_dc_ntvfs:local)
[766(4165)/854 at 55m37s] samba4.ldap.dirsync.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[767(4189)/854 at 57m9s] samba4.ldap.match_rules.python(ad_dc_ntvfs)
[768(4223)/854 at 57m26s] samba4.ldap.notification.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[769(4226)/854 at 57m35s] samba4.ldap.sites.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[770(4237)/854 at 57m41s] samba4.ldap.sort.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[771(4244)/854 at 57m46s] samba4.ldap.vlv.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[772(4259)/854 at 1h1m38s] samba4.ldap.linked_attributes.python(ad_dc_ntvfs)(ad_dc_ntvfs:local)
[773(4279)/854 at 1h1m43s] samba4.ldap.rodc.python(rodc)(rodc)
[774(4285)/854 at 1h1m47s] samba4.ldap.rodc_rwdc.python(rodc)(rodc:local)
[775(4305)/854 at 1h9m17s] samba4.drs.replica_sync_rodc.python(rodc)(rodc:local)
[776(4307)/854 at 1h9m25s] samba4.ldap.passwordsettings.python(ad_dc_ntvfs)
[777(4319)/854 at 1h10m4s] 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/b3569988/samba/source4/dsdb/tests/python/ldap_schema.py", line 1162, 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) -> 451
samba4.ldap.vlv.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 232
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) -> 201
samba3.smbtorture_s3.vfs_aio_fork(simpleserver).RW2(simpleserver) -> 138
samba4.ldb.ldaps with options -U"$USERNAME%$PASSWORD"(ad_dc_ntvfs)(ad_dc_ntvfs) -> 130
samba4.raw.notify(ad_dc_ntvfs) -> 106
samba4.ldap.dirsync.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 91
samba.tests.emulate.traffic_packet(ad_dc_ntvfs) -> 67
samba.tests.samba_tool.user(ad_dc_ntvfs:local) -> 66
ERROR: test failed with exit code 1