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-144/2018-10-29-1349/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-144/2018-10-29-1349/samba.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-10-29-1349/samba.stdout
  
The top commit at the time of the failure was:

commit 5391e21dea3168691cee1e6ef6c5959e46d62d1e
Author: David Mulder <dmulder at suse.com>
Date:   Wed Oct 24 10:55:02 2018 -0600

    lib:socket: If returning early, set ifaces
    
    Prevents a segfault in load_interfaces() when total interfaces == 1.
    Fixes regression caused by da68a1b2f417ec82ea4ed3e7a4d867cef8ca8f93.
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=13665
    
    Signed-off-by: David Mulder <dmulder at suse.com>
    Reviewed-by: Ralph Böhme <slow at samba.org>
    Reviewed-by: Volker Lendecke <vl at samba.org>
    Reviewed-by: Jeremy Allison <jra at samba.org>
    
    Autobuild-User(master): Volker Lendecke <vl at samba.org>
    Autobuild-Date(master): Sun Oct 28 00:35:35 CEST 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[747(3926)/850 at 59m24s] samba.tests.py_credentials(vampire_dc)
[748(3934)/850 at 59m28s] samba.tests.py_credentials(promoted_dc)
[749(3942)/850 at 1h23s] samba.tests.emulate.traffic(ad_dc_ntvfs)
[750(3944)/850 at 1h23s] samba.tests.emulate.traffic_packet(ad_dc_ntvfs)
[751(4033)/850 at 1h2m15s] samba.tests.blackbox.traffic_replay(ad_dc_ntvfs)
[752(4039)/850 at 1h2m30s] samba.tests.blackbox.traffic_learner(ad_dc_ntvfs)
[753(4041)/850 at 1h2m31s] samba.tests.blackbox.traffic_summary(ad_dc_ntvfs)
[754(4041)/850 at 1h2m31s] samba.tests.blackbox.smbcontrol(ad_dc_ntvfs:local)
[755(4043)/850 at 1h2m34s] samba.tests.blackbox.smbcontrol(promoted_dc:local)
[756(4045)/850 at 1h2m35s] samba4.ldap.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[757(4084)/850 at 1h2m49s] samba4.tokengroups.krb5.python(ad_dc_ntvfs)(ad_dc_ntvfs:local)
[758(4094)/850 at 1h3m3s] samba4.tokengroups.ntlm.python(ad_dc_ntvfs)(ad_dc_ntvfs:local)
[759(4103)/850 at 1h3m16s] samba4.sam.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[760(4120)/850 at 1h3m22s] samba4.user_account_control.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[761(4131)/850 at 1h3m45s] samba4.schemaInfo.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[762(4133)/850 at 1h3m50s] samba.tests.dsdb_schema_attributes(ad_dc_ntvfs:local)
[763(4139)/850 at 1h4m13s] samba4.urgent_replication.python(ad_dc_ntvfs)(ad_dc_ntvfs:local)
[764(4147)/850 at 1h4m18s] samba4.ldap.dirsync.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[765(4171)/850 at 1h6m27s] samba4.ldap.match_rules.python(ad_dc_ntvfs)
[766(4205)/850 at 1h6m53s] samba4.ldap.notification.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[767(4208)/850 at 1h7m4s] samba4.ldap.sites.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[768(4219)/850 at 1h7m13s] samba4.ldap.sort.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[769(4226)/850 at 1h7m22s] samba4.ldap.vlv.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[770(4241)/850 at 1h12m44s] samba4.ldap.linked_attributes.python(ad_dc_ntvfs)(ad_dc_ntvfs:local)
[771(4261)/850 at 1h12m51s] samba4.ldap.rodc.python(rodc)(rodc)
[772(4267)/850 at 1h12m56s] samba4.ldap.rodc_rwdc.python(rodc)(rodc:local)
[773(4287)/850 at 1h21m29s] samba4.drs.replica_sync_rodc.python(rodc)(rodc:local)
[774(4289)/850 at 1h21m37s] samba4.ldap.passwordsettings.python(ad_dc_ntvfs)
[775(4301)/850 at 1h22m25s] samba4.ldap_schema.python(ad_dc_ntvfs)(ad_dc_ntvfs)
[776(4327)/850 at 1h25m33s] samba4.ldap.possibleInferiors.python(ad_dc_ntvfs)(ad_dc_ntvfs)
UNEXPECTED(failure): samba4.ldap.possibleInferiors.python(ad_dc_ntvfs).objectClass.dfsConfiguration(ad_dc_ntvfs)
REASON: Exception: Exception: Returned incorrect list for objectclass dfsConfiguration
search:      ['fTDfs', 'msDFS-NamespaceAnchor'

FAILED (1 failures, 0 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) -> 513
samba4.ldap.vlv.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 322
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
samba4.ldap_schema.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 189
samba3.smbtorture_s3.vfs_aio_fork(simpleserver).RW2(simpleserver) -> 145
samba4.ldap.dirsync.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 128
samba4.ldb.ldaps with options -U"$USERNAME%$PASSWORD"(ad_dc_ntvfs)(ad_dc_ntvfs) -> 123
samba.tests.emulate.traffic_packet(ad_dc_ntvfs) -> 111
samba.tests.samba_tool.user(ad_dc_ntvfs:local) -> 109
ERROR: test failed with exit code 1