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-144/2019-03-04-1342/flakey.log

The failure seems to be in the "samba-nt4" suite, whose build logs are available here:

   https://git.samba.org/autobuild.flakey.sn-devel-144/2019-03-04-1342/samba-nt4.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2019-03-04-1342/samba-nt4.stdout
  
The top commit at the time of the failure was:

commit d1c2fe89073bf463a5791d433f60bc9381bdad62
Author: Volker Lendecke <vl at samba.org>
Date:   Thu Feb 28 21:47:51 2019 +0100

    libsmb: Make cli_posix_unlink/rmdir proper tevent_req/subreq pairs
    
    Signed-off-by: Volker Lendecke <vl at samba.org>
    Reviewed-by: Jeremy Allison <jra at samba.org>
    
    Autobuild-User(master): Jeremy Allison <jra at samba.org>
    Autobuild-Date(master): Sat Mar  2 00:55:56 UTC 2019 on sn-devel-144

and the last 50 lines of the stdout log were:

[501(2049)/586 at 33m1s] samba3.rpc.lsa.lookupsids over ncacn_ip_tcp with [spnego,smb1,bigendian] (nt4_dc)
[502(2050)/586 at 33m1s] samba3.rpc.lsa.lookupsids over ncacn_ip_tcp with [spnego,smb1,connect,bigendian] (nt4_dc)
[503(2051)/586 at 33m2s] samba3.rpc.lsa.lookupsids over ncacn_ip_tcp with [spnego,smb1,packet,bigendian] (nt4_dc)
[504(2052)/586 at 33m2s] samba3.rpc.lsa.lookupsids over ncacn_ip_tcp with [spnego,smb1,sign,bigendian] (nt4_dc)
[505(2053)/586 at 33m2s] samba3.rpc.lsa.lookupsids over ncacn_ip_tcp with [spnego,smb1,seal,bigendian] (nt4_dc)
[506(2054)/586 at 33m3s] samba3.rpc.lsa.lookupsids over ncacn_ip_tcp with [spnego,smb2,bigendian] (nt4_dc)
[507(2055)/586 at 33m3s] samba3.rpc.lsa.lookupsids over ncacn_ip_tcp with [spnego,smb2,connect,bigendian] (nt4_dc)
[508(2056)/586 at 33m4s] samba3.rpc.lsa.lookupsids over ncacn_ip_tcp with [spnego,smb2,packet,bigendian] (nt4_dc)
[509(2057)/586 at 33m4s] samba3.rpc.lsa.lookupsids over ncacn_ip_tcp with [spnego,smb2,sign,bigendian] (nt4_dc)
[510(2058)/586 at 33m4s] samba3.rpc.lsa.lookupsids over ncacn_ip_tcp with [spnego,smb2,seal,bigendian] (nt4_dc)
[511(2059)/586 at 33m5s] samba3.rpc.epmapper over ncalrpc(nt4_dc:local)
[512(2064)/586 at 33m5s] samba3.rpc.fsrvp over ncacn_np(nt4_dc:local)
[513(2074)/586 at 33m23s] samba4.rpc.lsa.secrets on ncacn_np with with -k no --option=clientusespnego=yes(nt4_dc)
[514(2098)/586 at 33m26s] samba4.rpc.lsa.secrets on ncacn_np with with -k no --option=clientusespnego=yes --option=ntlmssp_client:128bit=no(nt4_dc)
[515(2122)/586 at 33m30s] samba4.rpc.lsa.secrets on ncacn_np with with -k no --option=clientusespnego=yes --option=ntlmssp_client:56bit=yes(nt4_dc)
[516(2146)/586 at 33m33s] samba4.rpc.lsa.secrets on ncacn_np with with -k no --option=clientusespnego=yes --option=ntlmssp_client:56bit=no(nt4_dc)
[517(2170)/586 at 33m37s] samba4.rpc.lsa.secrets on ncacn_np with with -k no --option=clientusespnego=yes --option=ntlmssp_client:128bit=no --option=ntlmssp_client:56bit=yes(nt4_dc)
[518(2194)/586 at 33m42s] samba4.rpc.lsa.secrets on ncacn_np with with -k no --option=clientusespnego=yes --option=ntlmssp_client:128bit=no --option=ntlmssp_client:56bit=no(nt4_dc)
[519(2218)/586 at 33m46s] samba4.rpc.lsa.secrets on ncacn_np with with -k no --option=clientusespnego=yes --option=clientntlmv2auth=yes(nt4_dc)
[520(2242)/586 at 33m50s] samba4.rpc.lsa.secrets on ncacn_np with with -k no --option=clientusespnego=yes --option=clientntlmv2auth=yes --option=ntlmssp_client:128bit=no(nt4_dc)
[521(2266)/586 at 33m53s] samba4.rpc.lsa.secrets on ncacn_np with with -k no --option=clientusespnego=yes --option=clientntlmv2auth=yes --option=ntlmssp_client:128bit=no --option=ntlmssp_client:56bit=yes(nt4_dc)
[522(2290)/586 at 33m57s] samba4.rpc.lsa.secrets on ncacn_np with with -k no --option=clientusespnego=no --option=clientntlmv2auth=yes(nt4_dc)
[523(2314)/586 at 34m1s] samba4.rpc.lsa.secrets on ncacn_np with with -k no --option=gensec:spnego=no --option=clientntlmv2auth=yes(nt4_dc)
[524(2338)/586 at 34m6s] samba4.rpc.lsa.secrets on ncacn_np with with -k no --option=clientusespnego=no(nt4_dc)
[525(2362)/586 at 34m10s] samba.blackbox.pdbtest(nt4_dc)(nt4_dc:local)
[526(2380)/586 at 34m15s] samba4.rpc.echo on ncacn_np with object(nt4_dc)
[527(2389)/586 at 35m16s] samba4.rpc.echo on ncacn_ip_tcp with object(nt4_dc)
[528(2399)/586 at 35m17s] samba.tests.libsmb(nt4_dc)
[529(2400)/586 at 35m18s] samba4.blackbox.trust_ntlm(nt4_member:local)
[530(2437)/586 at 35m30s] samba4.winbind.struct(nt4_member:local)
Running WINBINDD_LOOKUP_NAME_SID (struct based)
UNEXPECTED(failure): samba4.winbind.struct.lookup_name_sid(nt4_member:local)
REASON: Exception: Exception: ../../source4/torture/winbind/struct_based.c:988: WINBINDD_LOOKUPNAME returned 0, expected 1

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.notify(nt4_dc) -> 112
samba3.smb2.compound_find(nt4_dc) -> 95
samba3.smb2.compound_find(nt4_dc) -> 89
samba3.smb2.notify(nt4_dc) -> 89
samba3.raw.search(nt4_dc) -> 76
samba3.blackbox.net.rpc.conf(nt4_dc) -> 69
samba3.rpc.samr.passwords.lockout(nt4_dc) -> 63
samba4.rpc.echo on ncacn_np with object(nt4_dc) -> 60
samba3.smb2.dir(nt4_dc) -> 60
samba3.raw.oplock(nt4_dc) -> 50
ERROR: test failed with exit code 1