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-144/2018-04-28-1223/flakey.log

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

   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-04-28-1223/samba-ad-dc.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-04-28-1223/samba-ad-dc.stdout
  
The top commit at the time of the failure was:

commit 110e72ccd8e241cb8bed7e257ee9d96767fd9e24
Author: Martin Schwenke <martin at meltin.net>
Date:   Thu Apr 5 16:09:22 2018 +1000

    ctdb-scripts: Drop CTDB_RC_LOCAL testing hook
    
    This is not used.
    
    Signed-off-by: Martin Schwenke <martin at meltin.net>
    Reviewed-by: Amitay Isaacs <amitay at gmail.com>
    
    Autobuild-User(master): Amitay Isaacs <amitay at samba.org>
    Autobuild-Date(master): Fri Apr 27 09:37:49 CEST 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[105(591)/526 at 6m4s] samba3.smb2.maxfid(ad_dc)
[106(592)/526 at 6m6s] samba3.rpc.authcontext(ad_dc)
[107(593)/526 at 6m6s] samba3.rpc.samba3.bind(ad_dc)
[108(594)/526 at 6m7s] samba3.rpc.samba3.srvsvc(ad_dc)
[109(595)/526 at 6m7s] samba3.rpc.samba3.sharesec(ad_dc)
[110(596)/526 at 6m9s] samba3.rpc.samba3.spoolss(ad_dc)
[111(597)/526 at 6m10s] samba3.rpc.samba3.wkssvc(ad_dc)
[112(598)/526 at 6m10s] samba3.rpc.samba3.winreg(ad_dc)
[113(599)/526 at 6m11s] samba3.rpc.samba3.getaliasmembership-0(ad_dc)
[114(600)/526 at 6m11s] samba3.rpc.samba3.netlogon(ad_dc)
[115(601)/526 at 6m12s] samba3.rpc.samba3.sessionkey(ad_dc)
[116(602)/526 at 6m13s] samba3.rpc.samba3.getusername(ad_dc)
[117(603)/526 at 6m14s] samba3.rpc.samba3.smb1-pipe-name(ad_dc)
[118(604)/526 at 6m14s] samba3.rpc.samba3.smb2-pipe-name(ad_dc)
[119(605)/526 at 6m14s] samba3.rpc.samba3.smb-reauth1(ad_dc)
[120(606)/526 at 6m15s] samba3.rpc.samba3.smb-reauth2(ad_dc)
[121(607)/526 at 6m15s] samba3.rpc.svcctl(ad_dc)
[122(618)/526 at 6m16s] samba3.rpc.ntsvcs(ad_dc)
[123(622)/526 at 6m16s] samba3.rpc.winreg(ad_dc)
[124(622)/526 at 6m17s] samba3.rpc.eventlog(ad_dc)
[125(628)/526 at 6m18s] samba3.rpc.spoolss.printserver(ad_dc)
[126(653)/526 at 6m31s] samba3.rpc.spoolss.win(ad_dc)
[127(654)/526 at 6m32s] samba3.rpc.spoolss.notify(ad_dc)
[128(655)/526 at 6m32s] samba3.rpc.spoolss.printer(ad_dc)
[129(697)/526 at 6m51s] samba3.rpc.spoolss.driver(ad_dc)
[130(709)/526 at 7m5s] samba3.rpc.lsa over ncacn_np (ad_dc)
[131(709)/526 at 7m7s] samba3.rpc.lsa over ncacn_ip_tcp (ad_dc)
[132(710)/526 at 7m7s] samba3.rpc.lsa-getuser(ad_dc)
[133(711)/526 at 7m7s] samba3.rpc.lsa.lookupsids(ad_dc)
smbtorture 4.9.0pre1-DEVELOPERBUILD
Using seed 1524911014
UNEXPECTED(failure): samba3.rpc.lsa.lookupsids.lsa.LookupSidsReply(ad_dc)
REASON: Exception: Exception: ../source4/torture/rpc/lsa_lookup.c:400: names.names[0].name.string was , expected S-1-5-21-1111111111-2222222222-3333333333-512: unexpected names[0].string

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
samba3.raw.session krb5(ad_dc) -> 52
samba3.smb2.session krb5(ad_dc) -> 35
samba3.smb2.dir(ad_dc) -> 21
samba3.base.delete(ad_dc) -> 20
samba3.smb2.ioctl(ad_dc) -> 19
samba3.rpc.spoolss.printer(ad_dc) -> 18
samba3.base.defer_open(ad_dc) -> 17
samba3.rpc.spoolss.driver(ad_dc) -> 15
samba3.rpc.spoolss.printserver(ad_dc) -> 14
samba3.raw.search(ad_dc) -> 10
ERROR: test failed with exit code 1