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-184/2019-04-02-1557/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-184/2019-04-02-1557/samba-nt4.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-184/2019-04-02-1557/samba-nt4.stdout
  
The top commit at the time of the failure was:

commit 92c726dc7a83834ee0e49d83e676b02f7687f5cd
Author: Kristján Valur <kristjan at rvx.is>
Date:   Tue Mar 12 09:33:15 2019 +0000

    make some auth functions return an NTSTATUS like other similar functions for better diagnostics.
    
    Signed-off-by: Kristján Valur <kristjan at rvx.is>
    Reviewed-by: Andreas Schneider <asn at samba.org>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>
    
    Autobuild-User(master): Andrew Bartlett <abartlet at samba.org>
    Autobuild-Date(master): Tue Apr  2 02:12:48 UTC 2019 on sn-devel-144

and the last 50 lines of the stdout log were:

[544(2503)/588 at 25m16s] samba.wbinfo_simple.online-status.domain=$DOMAIN(nt4_dc:local)
[545(2504)/588 at 25m16s] samba.wbinfo_simple.check-secret.domain=$DOMAIN(nt4_dc:local)
[546(2505)/588 at 25m16s] samba.wbinfo_simple.change-secret.domain=$DOMAIN(nt4_dc:local)
[547(2506)/588 at 25m16s] samba.wbinfo_simple.check-secret.domain=$DOMAIN(nt4_dc:local)
[548(2507)/588 at 25m17s] samba.wbinfo_simple.online-status.domain=$DOMAIN(nt4_dc:local)
[549(2508)/588 at 25m17s] samba.wbinfo_simple.domain-users(nt4_dc:local)
[550(2509)/588 at 25m17s] samba.wbinfo_simple.domain-groups(nt4_dc:local)
[551(2510)/588 at 25m17s] samba.wbinfo_simple.name-to-sid=$DC_USERNAME(nt4_dc:local)
[552(2511)/588 at 25m17s] samba.wbinfo_simple.name-to-sid=$DOMAIN/$DC_USERNAME(nt4_dc:local)
[553(2512)/588 at 25m17s] samba.wbinfo_simple.user-info=$DOMAIN/$DC_USERNAME(nt4_dc:local)
[554(2513)/588 at 25m17s] samba.wbinfo_simple.user-groups=$DOMAIN/$DC_USERNAME(nt4_dc:local)
[555(2514)/588 at 25m18s] samba.wbinfo_simple.authenticate=$DOMAIN/$DC_USERNAME%$DC_PASSWORD(nt4_dc:local)
[556(2515)/588 at 25m18s] samba.wbinfo_simple.allocate-uid(nt4_dc:local)
[557(2516)/588 at 25m18s] samba.wbinfo_simple.allocate-gid(nt4_dc:local)
[558(2517)/588 at 25m18s] samba.wbinfo_sids2xids.(nt4_dc:local)(nt4_dc:local)
[559(2518)/588 at 25m26s] samba.tests.ntlm_auth(nt4_dc:local)
[560(2531)/588 at 25m28s] samba.wbinfo_simple.ping(nt4_member:local)
[561(2532)/588 at 25m28s] samba.wbinfo_simple.separator(nt4_member:local)
[562(2533)/588 at 25m28s] samba.wbinfo_simple.own-domain(nt4_member:local)
[563(2534)/588 at 25m29s] samba.wbinfo_simple.all-domains(nt4_member:local)
[564(2535)/588 at 25m29s] samba.wbinfo_simple.trusted-domains(nt4_member:local)
[565(2536)/588 at 25m29s] samba.wbinfo_simple.domain-info=BUILTIN(nt4_member:local)
[566(2537)/588 at 25m29s] samba.wbinfo_simple.domain-info=$DOMAIN(nt4_member:local)
[567(2538)/588 at 25m29s] samba.wbinfo_simple.online-status(nt4_member:local)
[568(2539)/588 at 25m29s] samba.wbinfo_simple.online-status.domain=BUILTIN(nt4_member:local)
[569(2540)/588 at 25m29s] samba.wbinfo_simple.online-status.domain=$DOMAIN(nt4_member:local)
[570(2541)/588 at 25m30s] samba.wbinfo_simple.check-secret.domain=$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) -> 107
samba3.smb2.notify(nt4_dc) -> 83
samba3.rpc.samr.passwords.lockout(nt4_dc) -> 62
samba4.rpc.echo on ncacn_np with object(nt4_dc) -> 61
samba3.raw.search(nt4_dc) -> 52
samba3.smb2.compound_find(nt4_dc) -> 52
samba3.base.dir2(nt4_dc) -> 51
samba3.smb2.compound_find(nt4_dc) -> 51
samba3.blackbox.net.rpc.conf(nt4_dc) -> 50
samba3.rpc.samr.passwords.pwdlastset(nt4_dc) -> 48
ERROR: test failed with exit code 1
Makefile:16: recipe for target 'test' failed