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-144/2018-10-28-0635/flakey.log

The failure seems to be in the "samba-ad-dc-2" suite, whose build logs are available here:

   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-10-28-0635/samba-ad-dc-2.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-10-28-0635/samba-ad-dc-2.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:

[81(533)/147 at 2m22s] samba.wbinfo_simple.user-info=$DOMAIN/$DC_USERNAME(chgdcpass:local)
[82(534)/147 at 2m22s] samba.wbinfo_simple.user-groups=$DOMAIN/$DC_USERNAME(chgdcpass:local)
[83(535)/147 at 2m22s] samba.wbinfo_simple.authenticate=$DOMAIN/$DC_USERNAME%$DC_PASSWORD(chgdcpass:local)
[84(536)/147 at 2m22s] samba.wbinfo_simple.allocate-uid(chgdcpass:local)
[85(537)/147 at 2m22s] samba.wbinfo_simple.allocate-gid(chgdcpass:local)
[86(538)/147 at 2m22s] samba.wbinfo_sids2xids.(chgdcpass:local)(chgdcpass:local)
[87(539)/147 at 2m31s] samba.ntlm_auth.diagnostics(chgdcpass:local)(chgdcpass:local)
[88(540)/147 at 2m31s] samba.ntlm_auth.(chgdcpass:local)(chgdcpass:local)
[89(559)/147 at 2m34s] samba.tests.samba_tool.fsmo(fl2000dc:local)
[90(560)/147 at 2m35s] samba.tests.samba_tool.edit(fl2000dc:local)
[91(563)/147 at 2m36s] samba.tests.samba_tool.user_check_password_script(chgdcpass:local)
[92(564)/147 at 2m39s] samba.tests.samba_tool.sites(chgdcpass:local)
[93(567)/147 at 2m44s] samba.tests.samba_tool.dnscmd(chgdcpass:local)
[94(581)/147 at 6m56s] samba.tests.dcerpc.rpcecho(chgdcpass:local)
[95(591)/147 at 6m56s] samba.tests.dcerpc.raw_protocol(chgdcpass)
[96(710)/147 at 7m44s] samba.tests.encrypted_secrets(fl2000dc:local)
[97(712)/147 at 7m45s] samba4.blackbox.ldapcmp_restore(offlinebackupdc)
[98(713)/147 at 8m38s] samba4.blackbox.ldapcmp_restore(restoredc)
[99(714)/147 at 9m15s] samba4.blackbox.ldapcmp_restore(renamedc)
[100(715)/147 at 10m8s] samba4.blackbox.ldapcmp_restore(labdc)
[101(716)/147 at 10m53s] samba4.blackbox.join_ldapcmp(backupfromdc)
[102(718)/147 at 11m16s] samba4.blackbox.join_ldapcmp(offlinebackupdc)
[103(720)/147 at 11m38s] samba4.blackbox.join_ldapcmp(restoredc)
[104(722)/147 at 12m0s] samba4.blackbox.join_ldapcmp(renamedc)
[105(724)/147 at 12m22s] samba4.blackbox.join_ldapcmp(labdc)
[106(726)/147 at 12m43s] samba4.ldap_schema.python(fl2000dc)(fl2000dc)
UNEXPECTED(error): samba4.ldap_schema.python(fl2000dc).__main__.SchemaTests.test_duplicate_via_rename_attributeID(fl2000dc)
REASON: Exception: Exception: Traceback (most recent call last):
  File "/memdisk/autobuild/fl/b1377055/samba-ad-dc-2/source4/dsdb/tests/python/ldap_schema.py", line 648, in test_duplicate_via_rename_attributeID
    self.ldb.add_ldif(ldif)
  File "bin/python/samba/__init__.py", line 230, in add_ldif
    self.add(msg, controls)
LdbError: (68, 'LDAP error 68 LDAP_ENTRY_ALREADY_EXISTS -  <Entry CN=test-Attr1540701285-46713,CN=Schema,CN=Configuration,DC=samba2000,DC=example,DC=com already exists> <>')

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
samba.tests.samba_tool.dnscmd(chgdcpass:local) -> 252
samba.tests.dcerpc.raw_protocol(chgdcpass) -> 48
samba4.blackbox.join_ldapcmp(backupfromdc) -> 23
samba4.blackbox.join_ldapcmp(restoredc) -> 22
samba4.blackbox.join_ldapcmp(renamedc) -> 22
samba4.blackbox.join_ldapcmp(offlinebackupdc) -> 22
samba4.blackbox.join_ldapcmp(labdc) -> 21
samba4.net.api.become.dc(fl2000dc) -> 13
samba4.blackbox.kinit(fl2000dc:local)(fl2000dc:local) -> 10
samba.wbinfo_sids2xids.(chgdcpass:local)(chgdcpass:local) -> 9
ERROR: test failed with exit code 1