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-144/2018-12-07-2011/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-144/2018-12-07-2011/samba.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-12-07-2011/samba.stdout
  
The top commit at the time of the failure was:

commit 7b60d72f67231e7675b0fad724edd59a0b3f4444
Author: Andreas Schneider <asn at samba.org>
Date:   Thu Dec 6 09:35:15 2018 +0100

    librpc:ndr: Give the optimizer hints for ndr_push_bytes()
    
    Also remove the redundant check in ndr_push_DATA_BLOB.
    
    Signed-off-by: Andreas Schneider <asn at samba.org>
    Reviewed-by: Stefan Metzmacher <metze at samba.org>
    
    Autobuild-User(master): Andreas Schneider <asn at cryptomilk.org>
    Autobuild-Date(master): Fri Dec  7 15:33:38 CET 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[754(4084)/855 at 1h15m13s] samba.tests.blackbox.traffic_replay(ad_dc_ntvfs)
[755(4090)/855 at 1h15m30s] samba.tests.blackbox.traffic_learner(ad_dc_ntvfs)
[756(4092)/855 at 1h15m30s] samba.tests.blackbox.traffic_summary(ad_dc_ntvfs)
[757(4092)/855 at 1h15m30s] samba.tests.blackbox.smbcontrol(ad_dc_ntvfs:local)
[758(4094)/855 at 1h15m32s] samba.tests.blackbox.smbcontrol(promoted_dc:local)
[759(4096)/855 at 1h15m33s] samba4.ldap.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[760(4135)/855 at 1h15m47s] samba4.tokengroups.krb5.python(ad_dc_ntvfs)(ad_dc_ntvfs:local)
[761(4145)/855 at 1h15m59s] samba4.tokengroups.ntlm.python(ad_dc_ntvfs)(ad_dc_ntvfs:local)
[762(4154)/855 at 1h16m10s] samba4.sam.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[763(4171)/855 at 1h16m15s] samba4.user_account_control.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[764(4182)/855 at 1h16m36s] samba4.schemaInfo.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[765(4184)/855 at 1h16m41s] samba.tests.dsdb_schema_attributes(ad_dc_ntvfs:local)
[766(4190)/855 at 1h17m6s] samba4.urgent_replication.python(ad_dc_ntvfs)(ad_dc_ntvfs:local)
[767(4198)/855 at 1h17m11s] samba4.ldap.dirsync.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[768(4222)/855 at 1h19m39s] samba4.ldap.match_rules.python(ad_dc_ntvfs)
[769(4256)/855 at 1h20m16s] samba4.ldap.notification.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[770(4259)/855 at 1h20m27s] samba4.ldap.sites.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[771(4270)/855 at 1h20m38s] samba4.ldap.sort.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[772(4277)/855 at 1h20m50s] samba4.ldap.vlv.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[773(4292)/855 at 1h27m38s] samba4.ldap.linked_attributes.python(ad_dc_ntvfs)(ad_dc_ntvfs:local)
[774(4312)/855 at 1h27m46s] samba4.ldap.rodc.python(rodc)(rodc)
[775(4318)/855 at 1h27m53s] samba4.ldap.rodc_rwdc.python(rodc)(rodc:local)
[776(4338)/855 at 1h38m3s] samba4.drs.replica_sync_rodc.python(rodc)(rodc:local)
[777(4340)/855 at 1h38m15s] samba4.ldap.passwordsettings.python(ad_dc_ntvfs)
[778(4352)/855 at 1h39m28s] 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/b230774/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) -> 610
samba4.ldap.vlv.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 408
samba4.rpc.samr.passwords.lockout on ncacn_np with (ad_dc_ntvfs) -> 233
samba4.rpc.samr.passwords.pwdlastset on ncacn_np with (ad_dc_ntvfs) -> 209
samba4.ldb.ldaps with options -U"$USERNAME%$PASSWORD"(ad_dc_ntvfs)(ad_dc_ntvfs) -> 195
samba3.smbtorture_s3.vfs_aio_fork(simpleserver).RW2(simpleserver) -> 153
samba4.ldap.dirsync.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 148
samba4.raw.notify(ad_dc_ntvfs) -> 106
idmap.rfc2307(ad_member_rfc2307) -> 99
samba.tests.emulate.traffic_packet(ad_dc_ntvfs) -> 89
ERROR: test failed with exit code 1