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-144/2018-11-07-0136/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-144/2018-11-07-0136/samba.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-11-07-0136/samba.stdout
  
The top commit at the time of the failure was:

commit 8d787f73bbcaff181583eadb9b15dcaf863c032c
Author: Volker Lendecke <vl at samba.org>
Date:   Sat Nov 3 10:11:26 2018 +0100

    tdb: Align integer types
    
    tdb->max_dead_records is "int", as is the corresponding parameter to
    tdb_set_max_dead(). Not that a signed variable makes any sense, but
    this is old code and tdb_set_max_dead() is a public API which we
    should not change for this.
    
    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): Tue Nov  6 21:52:32 CET 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[751(4035)/850 at 52m54s] samba.tests.blackbox.traffic_replay(ad_dc_ntvfs)
[752(4041)/850 at 53m6s] samba.tests.blackbox.traffic_learner(ad_dc_ntvfs)
[753(4043)/850 at 53m7s] samba.tests.blackbox.traffic_summary(ad_dc_ntvfs)
[754(4043)/850 at 53m7s] samba.tests.blackbox.smbcontrol(ad_dc_ntvfs:local)
[755(4045)/850 at 53m9s] samba.tests.blackbox.smbcontrol(promoted_dc:local)
[756(4047)/850 at 53m10s] samba4.ldap.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[757(4086)/850 at 53m22s] samba4.tokengroups.krb5.python(ad_dc_ntvfs)(ad_dc_ntvfs:local)
[758(4096)/850 at 53m31s] samba4.tokengroups.ntlm.python(ad_dc_ntvfs)(ad_dc_ntvfs:local)
[759(4105)/850 at 53m39s] samba4.sam.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[760(4122)/850 at 53m43s] samba4.user_account_control.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[761(4133)/850 at 53m56s] samba4.schemaInfo.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[762(4135)/850 at 53m59s] samba.tests.dsdb_schema_attributes(ad_dc_ntvfs:local)
[763(4141)/850 at 54m13s] samba4.urgent_replication.python(ad_dc_ntvfs)(ad_dc_ntvfs:local)
[764(4149)/850 at 54m16s] samba4.ldap.dirsync.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[765(4173)/850 at 55m48s] samba4.ldap.match_rules.python(ad_dc_ntvfs)
[766(4207)/850 at 56m5s] samba4.ldap.notification.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[767(4210)/850 at 56m10s] samba4.ldap.sites.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[768(4221)/850 at 56m16s] samba4.ldap.sort.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[769(4228)/850 at 56m21s] samba4.ldap.vlv.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[770(4243)/850 at 1h16s] samba4.ldap.linked_attributes.python(ad_dc_ntvfs)(ad_dc_ntvfs:local)
[771(4263)/850 at 1h21s] samba4.ldap.rodc.python(rodc)(rodc)
[772(4269)/850 at 1h25s] samba4.ldap.rodc_rwdc.python(rodc)(rodc:local)
[773(4289)/850 at 1h7m59s] samba4.drs.replica_sync_rodc.python(rodc)(rodc:local)
[774(4291)/850 at 1h8m7s] samba4.ldap.passwordsettings.python(ad_dc_ntvfs)
[775(4303)/850 at 1h8m45s] 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/b2160726/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) -> 453
samba4.ldap.vlv.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 235
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) -> 200
samba3.smbtorture_s3.vfs_aio_fork(simpleserver).RW2(simpleserver) -> 143
samba4.ldb.ldaps with options -U"$USERNAME%$PASSWORD"(ad_dc_ntvfs)(ad_dc_ntvfs) -> 115
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) -> 68
samba.tests.samba_tool.user(ad_dc_ntvfs:local) -> 65
ERROR: test failed with exit code 1