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-144/2018-06-28-1958/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-144/2018-06-28-1958/samba.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-06-28-1958/samba.stdout
  
The top commit at the time of the failure was:

commit 396f123121ddb290f4a5536a2224aa4a651c072f
Author: Björn Baumbach <bb at sernet.de>
Date:   Wed Jun 27 14:20:40 2018 +0200

    README.Coding: Fix link to Python coding style guide (PEP 8)
    
    Signed-off-by: Björn Baumbach <bb at sernet.de>
    Reviewed-by: David Mulder <dmulder at suse.com>
    
    Autobuild-User(master): Björn Baumbach <bbaumbach at samba.org>
    Autobuild-Date(master): Thu Jun 28 15:04:44 CEST 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

		Last attempt @ Thu Jun 28 19:51:36 2018 CEST failed, result 8457 (WERR_DS_DRA_SINK_DISABLED)
		3 consecutive failure(s).
		Last success @ Thu Jun 28 19:36:34 2018 CEST

DC=ForestDnsZones,DC=samba,DC=example,DC=com
	Default-First-Site-Name\LOCALVAMPIREDC via RPC
		DSA object GUID: 583e781c-2748-415a-96d9-fc5577bc6833
		Last attempt @ Thu Jun 28 19:51:46 2018 CEST failed, result 8457 (WERR_DS_DRA_SINK_DISABLED)
		3 consecutive failure(s).
		Last success @ Thu Jun 28 19:37:12 2018 CEST

DC=ForestDnsZones,DC=samba,DC=example,DC=com
	Default-First-Site-Name\PROMOTEDVDC via RPC
		DSA object GUID: 3298752e-1cc9-4994-a051-be3b769734bb
		Last attempt @ Thu Jun 28 19:51:51 2018 CEST failed, result 8457 (WERR_DS_DRA_SINK_DISABLED)
		3 consecutive failure(s).
		Last success @ Thu Jun 28 19:36:34 2018 CEST

CN=Schema,CN=Configuration,DC=samba,DC=example,DC=com
	Default-First-Site-Name\LOCALVAMPIREDC via RPC
		DSA object GUID: 583e781c-2748-415a-96d9-fc5577bc6833
		Last attempt @ Thu Jun 28 19:52:26 2018 CEST failed, result 8457 (WERR_DS_DRA_SINK_DISABLED)
		2 consecutive failure(s).
		Last success @ Thu Jun 28 19:43:01 2018 CEST

CN=Schema,CN=Configuration,DC=samba,DC=example,DC=com
	Default-First-Site-Name\PROMOTEDVDC via RPC
		DSA object GUID: 3298752e-1cc9-4994-a051-be3b769734bb
		Last attempt @ Thu Jun 28 19:52:27 2018 CEST failed, result 8457 (WERR_DS_DRA_SINK_DISABLED)
		4 consecutive failure(s).
		Last success @ Thu Jun 28 19:36:35 2018 CEST

'; stderr: ''

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.drs.link_conflicts.python(vampire_dc)(vampire_dc) -> 453
samba4.ldap.rodc_rwdc.python(rodc)(rodc:local) -> 442
samba4.drs.ridalloc_exop.python(vampire_dc)(vampire_dc) -> 308
samba4.ldap.vlv.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 231
samba4.rpc.samr.passwords.lockout on ncacn_np with (ad_dc_ntvfs) -> 225
samba4.drs.replica_sync.python(vampire_dc)(vampire_dc:local) -> 220
samba4.rpc.samr.passwords.pwdlastset on ncacn_np with (ad_dc_ntvfs) -> 199
samba4.drs.samba_tool_drs.python(promoted_dc)(promoted_dc:local) -> 192
samba4.drs.samba_tool_drs.python(vampire_dc)(vampire_dc:local) -> 190
samba4.ldap.password_lockout.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 159
ERROR: test failed with exit code 1