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-144/2018-10-12-1316/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-144/2018-10-12-1316/samba-nt4.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-10-12-1316/samba-nt4.stdout
  
The top commit at the time of the failure was:

commit 3efb4588abaf55c0b58b035790d9da822f62b09d
Author: Tim Beale <timbeale at catalyst.net.nz>
Date:   Thu Oct 11 17:50:52 2018 +1300

    dsdb: Add dsdb_request_has_control() helper function
    
    Most of the DSDB modules only want to check the existence of a control,
    rather than access the control itself. Adding a helper function allows
    the code to ask more natural-sounding yes/no questions, and tidies up
    an ugly-looking long-line in extended_dn_out.c.
    
    Signed-off-by: Tim Beale <timbeale at catalyst.net.nz>
    Reviewed-by: Douglas Bagnall <douglas.bagnall at catalyst.net.nz>
    Reviewed-by: Gary Lockyer <gary at catalyst.net.nz>
    
    Autobuild-User(master): Douglas Bagnall <dbagnall at samba.org>
    Autobuild-Date(master): Fri Oct 12 07:23:26 CEST 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[525(2440)/571 at 28m52s] samba.wbinfo_simple.online-status.domain=$DOMAIN(nt4_dc:local)
[526(2441)/571 at 28m52s] samba.wbinfo_simple.check-secret.domain=$DOMAIN(nt4_dc:local)
[527(2442)/571 at 28m52s] samba.wbinfo_simple.change-secret.domain=$DOMAIN(nt4_dc:local)
[528(2443)/571 at 28m52s] samba.wbinfo_simple.check-secret.domain=$DOMAIN(nt4_dc:local)
[529(2444)/571 at 28m52s] samba.wbinfo_simple.online-status.domain=$DOMAIN(nt4_dc:local)
[530(2445)/571 at 28m52s] samba.wbinfo_simple.domain-users(nt4_dc:local)
[531(2446)/571 at 28m52s] samba.wbinfo_simple.domain-groups(nt4_dc:local)
[532(2447)/571 at 28m52s] samba.wbinfo_simple.name-to-sid=$DC_USERNAME(nt4_dc:local)
[533(2448)/571 at 28m52s] samba.wbinfo_simple.name-to-sid=$DOMAIN/$DC_USERNAME(nt4_dc:local)
[534(2449)/571 at 28m52s] samba.wbinfo_simple.user-info=$DOMAIN/$DC_USERNAME(nt4_dc:local)
[535(2450)/571 at 28m53s] samba.wbinfo_simple.user-groups=$DOMAIN/$DC_USERNAME(nt4_dc:local)
[536(2451)/571 at 28m53s] samba.wbinfo_simple.authenticate=$DOMAIN/$DC_USERNAME%$DC_PASSWORD(nt4_dc:local)
[537(2452)/571 at 28m53s] samba.wbinfo_simple.allocate-uid(nt4_dc:local)
[538(2453)/571 at 28m53s] samba.wbinfo_simple.allocate-gid(nt4_dc:local)
[539(2454)/571 at 28m53s] samba.wbinfo_sids2xids.(nt4_dc:local)(nt4_dc:local)
[540(2455)/571 at 29m1s] samba.ntlm_auth.diagnostics(nt4_dc:local)(nt4_dc:local)
[541(2456)/571 at 29m1s] samba.ntlm_auth.(nt4_dc:local)(nt4_dc:local)
[542(2475)/571 at 29m3s] samba.wbinfo_simple.ping(nt4_member:local)
[543(2476)/571 at 29m3s] samba.wbinfo_simple.separator(nt4_member:local)
[544(2477)/571 at 29m3s] samba.wbinfo_simple.own-domain(nt4_member:local)
[545(2478)/571 at 29m3s] samba.wbinfo_simple.all-domains(nt4_member:local)
[546(2479)/571 at 29m3s] samba.wbinfo_simple.trusted-domains(nt4_member:local)
[547(2480)/571 at 29m3s] samba.wbinfo_simple.domain-info=BUILTIN(nt4_member:local)
[548(2481)/571 at 29m3s] samba.wbinfo_simple.domain-info=$DOMAIN(nt4_member:local)
[549(2482)/571 at 29m3s] samba.wbinfo_simple.online-status(nt4_member:local)
[550(2483)/571 at 29m4s] samba.wbinfo_simple.online-status.domain=BUILTIN(nt4_member:local)
[551(2484)/571 at 29m4s] samba.wbinfo_simple.online-status.domain=$DOMAIN(nt4_member:local)
[552(2485)/571 at 29m4s] samba.wbinfo_simple.check-secret.domain=$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) -> 84
samba3.smb2.compound_find(nt4_dc) -> 82
samba3.smb2.compound_find(nt4_dc) -> 79
samba3.blackbox.net.rpc.conf(nt4_dc) -> 63
samba3.rpc.samr.passwords.lockout(nt4_dc) -> 61
samba4.rpc.echo on ncacn_np with object(nt4_dc) -> 61
samba3.raw.search(nt4_dc) -> 61
samba3.rpc.samr.passwords.pwdlastset(nt4_dc) -> 50
samba3.raw.oplock(nt4_dc) -> 48
ERROR: test failed with exit code 1