autobuild[sn-devel-184]: intermittent test failure detected

[autobuild]

The autobuild test system (on sn-devel-184) 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-184/2019-07-06-1605/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-184/2019-07-06-1605/samba-nt4.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-184/2019-07-06-1605/samba-nt4.stdout
  
The top commit at the time of the failure was:

commit cd0df26bdc71175b69e11acd5750721ba6cf67e8
Author: Martin Schwenke <martin at meltin.net>
Date:   Thu Jun 27 20:41:57 2019 +1000

    WHATSNEW: Add CTDB updates for 4.11
    
    Signed-off-by: Martin Schwenke <martin at meltin.net>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>
    Reviewed-by: Amitay Isaacs <amitay at gmail.com>
    
    Autobuild-User(master): Amitay Isaacs <amitay at samba.org>
    Autobuild-Date(master): Fri Jul  5 08:05:00 UTC 2019 on sn-devel-184

and the last 50 lines of the stdout log were:

[557(2550)/601 at 30m4s] samba.wbinfo_simple.online-status.domain=$DOMAIN(nt4_dc:local)
[558(2551)/601 at 30m4s] samba.wbinfo_simple.check-secret.domain=$DOMAIN(nt4_dc:local)
[559(2552)/601 at 30m5s] samba.wbinfo_simple.change-secret.domain=$DOMAIN(nt4_dc:local)
[560(2553)/601 at 30m5s] samba.wbinfo_simple.check-secret.domain=$DOMAIN(nt4_dc:local)
[561(2554)/601 at 30m5s] samba.wbinfo_simple.online-status.domain=$DOMAIN(nt4_dc:local)
[562(2555)/601 at 30m5s] samba.wbinfo_simple.domain-users(nt4_dc:local)
[563(2556)/601 at 30m5s] samba.wbinfo_simple.domain-groups(nt4_dc:local)
[564(2557)/601 at 30m5s] samba.wbinfo_simple.name-to-sid=$DC_USERNAME(nt4_dc:local)
[565(2558)/601 at 30m6s] samba.wbinfo_simple.name-to-sid=$DOMAIN/$DC_USERNAME(nt4_dc:local)
[566(2559)/601 at 30m6s] samba.wbinfo_simple.user-info=$DOMAIN/$DC_USERNAME(nt4_dc:local)
[567(2560)/601 at 30m6s] samba.wbinfo_simple.user-groups=$DOMAIN/$DC_USERNAME(nt4_dc:local)
[568(2561)/601 at 30m6s] samba.wbinfo_simple.authenticate=$DOMAIN/$DC_USERNAME%$DC_PASSWORD(nt4_dc:local)
[569(2562)/601 at 30m6s] samba.wbinfo_simple.allocate-uid(nt4_dc:local)
[570(2563)/601 at 30m6s] samba.wbinfo_simple.allocate-gid(nt4_dc:local)
[571(2564)/601 at 30m7s] samba.wbinfo_sids2xids.(nt4_dc:local)(nt4_dc:local)
[572(2565)/601 at 30m15s] samba.tests.ntlm_auth(nt4_dc:local)
[573(2578)/601 at 30m18s] samba.wbinfo_simple.ping(nt4_member:local)
[574(2579)/601 at 30m18s] samba.wbinfo_simple.separator(nt4_member:local)
[575(2580)/601 at 30m18s] samba.wbinfo_simple.own-domain(nt4_member:local)
[576(2581)/601 at 30m18s] samba.wbinfo_simple.all-domains(nt4_member:local)
[577(2582)/601 at 30m18s] samba.wbinfo_simple.trusted-domains(nt4_member:local)
[578(2583)/601 at 30m18s] samba.wbinfo_simple.domain-info=BUILTIN(nt4_member:local)
[579(2584)/601 at 30m19s] samba.wbinfo_simple.domain-info=$DOMAIN(nt4_member:local)
[580(2585)/601 at 30m19s] samba.wbinfo_simple.online-status(nt4_member:local)
[581(2586)/601 at 30m19s] samba.wbinfo_simple.online-status.domain=BUILTIN(nt4_member:local)
[582(2587)/601 at 30m19s] samba.wbinfo_simple.online-status.domain=$DOMAIN(nt4_member:local)
[583(2588)/601 at 30m19s] samba.wbinfo_simple.check-secret.domain=$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.smb2.lease(nt4_dc) -> 161
samba3.raw.notify(nt4_dc) -> 106
samba3.smb2.oplock(nt4_dc) -> 104
samba3.smb2.notify(nt4_dc) -> 82
samba3.blackbox.net.rpc.conf(nt4_dc) -> 80
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) -> 59
samba3.raw.search(nt4_dc) -> 58
samba3.base.dir2(nt4_dc) -> 56
ERROR: test failed with exit code 1
Makefile:16: recipe for target 'test' failed