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-144/2018-09-24-0048/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-144/2018-09-24-0048/samba-nt4.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-09-24-0048/samba-nt4.stdout
  
The top commit at the time of the failure was:

commit 6dc9f70bbb733519bcd57a69cc87133224a9d2fe
Author: Philipp Gesang <philipp.gesang at intra2net.com>
Date:   Mon Aug 20 14:50:39 2018 +0200

    tests/blackbox: add test for net ads JSON output
    
    Implement blackbox tests for
    
        $ net ads info --json
        $ net ads lookup --json
    
    that validate
    
        a) JSON wellformedness (by feeding it into the JSON library
           that ships with Python), and
        b) equality of the set of keys printed to that of the
           non-JSON version.
    
    Reviewed-by: Gary Lockyer <gary at catalyst.net.nz>
    Signed-off-by: Philipp Gesang <philipp.gesang at intra2net.com>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>
    
    Autobuild-User(master): Andrew Bartlett <abartlet at samba.org>
    Autobuild-Date(master): Sat Sep 22 09:20:09 CEST 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[525(2437)/571 at 21m49s] samba.wbinfo_simple.online-status.domain=$DOMAIN(nt4_dc:local)
[526(2438)/571 at 21m49s] samba.wbinfo_simple.check-secret.domain=$DOMAIN(nt4_dc:local)
[527(2439)/571 at 21m49s] samba.wbinfo_simple.change-secret.domain=$DOMAIN(nt4_dc:local)
[528(2440)/571 at 21m49s] samba.wbinfo_simple.check-secret.domain=$DOMAIN(nt4_dc:local)
[529(2441)/571 at 21m49s] samba.wbinfo_simple.online-status.domain=$DOMAIN(nt4_dc:local)
[530(2442)/571 at 21m50s] samba.wbinfo_simple.domain-users(nt4_dc:local)
[531(2443)/571 at 21m50s] samba.wbinfo_simple.domain-groups(nt4_dc:local)
[532(2444)/571 at 21m50s] samba.wbinfo_simple.name-to-sid=$DC_USERNAME(nt4_dc:local)
[533(2445)/571 at 21m50s] samba.wbinfo_simple.name-to-sid=$DOMAIN/$DC_USERNAME(nt4_dc:local)
[534(2446)/571 at 21m50s] samba.wbinfo_simple.user-info=$DOMAIN/$DC_USERNAME(nt4_dc:local)
[535(2447)/571 at 21m50s] samba.wbinfo_simple.user-groups=$DOMAIN/$DC_USERNAME(nt4_dc:local)
[536(2448)/571 at 21m50s] samba.wbinfo_simple.authenticate=$DOMAIN/$DC_USERNAME%$DC_PASSWORD(nt4_dc:local)
[537(2449)/571 at 21m50s] samba.wbinfo_simple.allocate-uid(nt4_dc:local)
[538(2450)/571 at 21m50s] samba.wbinfo_simple.allocate-gid(nt4_dc:local)
[539(2451)/571 at 21m50s] samba.wbinfo_sids2xids.(nt4_dc:local)(nt4_dc:local)
[540(2452)/571 at 21m56s] samba.ntlm_auth.diagnostics(nt4_dc:local)(nt4_dc:local)
[541(2453)/571 at 21m56s] samba.ntlm_auth.(nt4_dc:local)(nt4_dc:local)
[542(2472)/571 at 21m58s] samba.wbinfo_simple.ping(nt4_member:local)
[543(2473)/571 at 21m58s] samba.wbinfo_simple.separator(nt4_member:local)
[544(2474)/571 at 21m58s] samba.wbinfo_simple.own-domain(nt4_member:local)
[545(2475)/571 at 21m58s] samba.wbinfo_simple.all-domains(nt4_member:local)
[546(2476)/571 at 21m58s] samba.wbinfo_simple.trusted-domains(nt4_member:local)
[547(2477)/571 at 21m58s] samba.wbinfo_simple.domain-info=BUILTIN(nt4_member:local)
[548(2478)/571 at 21m58s] samba.wbinfo_simple.domain-info=$DOMAIN(nt4_member:local)
[549(2479)/571 at 21m59s] samba.wbinfo_simple.online-status(nt4_member:local)
[550(2480)/571 at 21m59s] samba.wbinfo_simple.online-status.domain=BUILTIN(nt4_member:local)
[551(2481)/571 at 21m59s] samba.wbinfo_simple.online-status.domain=$DOMAIN(nt4_member:local)
[552(2482)/571 at 21m59s] samba.wbinfo_simple.check-secret.domain=$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) -> 101
samba3.smb2.notify(nt4_dc) -> 83
samba3.rpc.samr.passwords.lockout(nt4_dc) -> 62
samba4.rpc.echo on ncacn_np with object(nt4_dc) -> 60
samba3.smb2.compound_find(nt4_dc) -> 56
samba3.smb2.compound_find(nt4_dc) -> 55
samba3.rpc.samr.passwords.pwdlastset(nt4_dc) -> 49
samba3.smb2.lease(nt4_dc) -> 45
samba3.raw.oplock(nt4_dc) -> 43
samba3.smb2.oplock(nt4_dc) -> 42
ERROR: test failed with exit code 1