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-144/2018-09-08-1243/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-144/2018-09-08-1243/samba-nt4.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-09-08-1243/samba-nt4.stdout
  
The top commit at the time of the failure was:

commit 8c00c017cb5dc930b229a6fff8e541322a63494e
Author: Jeremy Allison <jra at samba.org>
Date:   Fri Sep 7 15:14:37 2018 -0700

    s4: torture: Ensure raw notify tests use different directories.
    
    Should help track down flapping tests.
    
    Signed-off-by: Jeremy Allison <jra at samba.org>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>
    
    Autobuild-User(master): Andrew Bartlett <abartlet at samba.org>
    Autobuild-Date(master): Sat Sep  8 11:37:44 CEST 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[525(2437)/571 at 22m33s] samba.wbinfo_simple.online-status.domain=$DOMAIN(nt4_dc:local)
[526(2438)/571 at 22m33s] samba.wbinfo_simple.check-secret.domain=$DOMAIN(nt4_dc:local)
[527(2439)/571 at 22m34s] samba.wbinfo_simple.change-secret.domain=$DOMAIN(nt4_dc:local)
[528(2440)/571 at 22m34s] samba.wbinfo_simple.check-secret.domain=$DOMAIN(nt4_dc:local)
[529(2441)/571 at 22m34s] samba.wbinfo_simple.online-status.domain=$DOMAIN(nt4_dc:local)
[530(2442)/571 at 22m34s] samba.wbinfo_simple.domain-users(nt4_dc:local)
[531(2443)/571 at 22m34s] samba.wbinfo_simple.domain-groups(nt4_dc:local)
[532(2444)/571 at 22m34s] samba.wbinfo_simple.name-to-sid=$DC_USERNAME(nt4_dc:local)
[533(2445)/571 at 22m34s] samba.wbinfo_simple.name-to-sid=$DOMAIN/$DC_USERNAME(nt4_dc:local)
[534(2446)/571 at 22m34s] samba.wbinfo_simple.user-info=$DOMAIN/$DC_USERNAME(nt4_dc:local)
[535(2447)/571 at 22m34s] samba.wbinfo_simple.user-groups=$DOMAIN/$DC_USERNAME(nt4_dc:local)
[536(2448)/571 at 22m34s] samba.wbinfo_simple.authenticate=$DOMAIN/$DC_USERNAME%$DC_PASSWORD(nt4_dc:local)
[537(2449)/571 at 22m34s] samba.wbinfo_simple.allocate-uid(nt4_dc:local)
[538(2450)/571 at 22m34s] samba.wbinfo_simple.allocate-gid(nt4_dc:local)
[539(2451)/571 at 22m34s] samba.wbinfo_sids2xids.(nt4_dc:local)(nt4_dc:local)
[540(2452)/571 at 22m41s] samba.ntlm_auth.diagnostics(nt4_dc:local)(nt4_dc:local)
[541(2453)/571 at 22m41s] samba.ntlm_auth.(nt4_dc:local)(nt4_dc:local)
[542(2472)/571 at 22m42s] samba.wbinfo_simple.ping(nt4_member:local)
[543(2473)/571 at 22m42s] samba.wbinfo_simple.separator(nt4_member:local)
[544(2474)/571 at 22m42s] samba.wbinfo_simple.own-domain(nt4_member:local)
[545(2475)/571 at 22m42s] samba.wbinfo_simple.all-domains(nt4_member:local)
[546(2476)/571 at 22m42s] samba.wbinfo_simple.trusted-domains(nt4_member:local)
[547(2477)/571 at 22m43s] samba.wbinfo_simple.domain-info=BUILTIN(nt4_member:local)
[548(2478)/571 at 22m43s] samba.wbinfo_simple.domain-info=$DOMAIN(nt4_member:local)
[549(2479)/571 at 22m43s] samba.wbinfo_simple.online-status(nt4_member:local)
[550(2480)/571 at 22m43s] samba.wbinfo_simple.online-status.domain=BUILTIN(nt4_member:local)
[551(2481)/571 at 22m43s] samba.wbinfo_simple.online-status.domain=$DOMAIN(nt4_member:local)
[552(2482)/571 at 22m43s] samba.wbinfo_simple.check-secret.domain=$DOMAIN(nt4_member:local)
UNEXPECTED(failure): samba.wbinfo_simple.check-secret.domain=SAMBA-TEST.wbinfo(nt4_member:local)
REASON: Exception: Exception: wbcCheckTrustCredentials(SAMBA-TEST): error code was NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND (0xc0000233)
failed to call wbcCheckTrustCredentials: WBC_ERR_AUTH_ERROR
Could not check secret
checking the trust secret for domain SAMBA-TEST via RPC calls failed

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) -> 102
samba3.smb2.notify(nt4_dc) -> 82
samba3.rpc.samr.passwords.lockout(nt4_dc) -> 61
samba4.rpc.echo on ncacn_np with object(nt4_dc) -> 60
samba3.smb2.compound_find(nt4_dc) -> 58
samba3.rpc.samr.passwords.pwdlastset(nt4_dc) -> 49
samba3.smb2.lease(nt4_dc) -> 45
samba3.raw.oplock(nt4_dc) -> 44
samba3.smb2.oplock(nt4_dc) -> 42
samba3.blackbox.net.rpc.conf(nt4_dc) -> 42
ERROR: test failed with exit code 1