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-144/2019-01-09-0129/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-144/2019-01-09-0129/samba-nt4.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2019-01-09-0129/samba-nt4.stdout
  
The top commit at the time of the failure was:

commit ee4a33a4fff1ba86f353d72970fe990774dee893
Author: Volker Lendecke <vl at samba.org>
Date:   Tue Dec 18 15:53:48 2018 +0100

    idmap: In _wbint_Sids2UnixIDs, pass back what we have
    
    SOME_UNMAPPED does not mean that nothing worthwhile is in here. We
    need to pass what we have.
    
    Signed-off-by: Volker Lendecke <vl at samba.org>
    Reviewed-by: Stefan Metzmacher <metze at samba.org>
    
    Autobuild-User(master): Volker Lendecke <vl at samba.org>
    Autobuild-Date(master): Tue Jan  8 13:15:35 CET 2019 on sn-devel-144

and the last 50 lines of the stdout log were:

[533(2464)/578 at 31m48s] samba.wbinfo_simple.online-status.domain=BUILTIN(nt4_dc:local)
[534(2465)/578 at 31m48s] samba.wbinfo_simple.online-status.domain=$DOMAIN(nt4_dc:local)
[535(2466)/578 at 31m48s] samba.wbinfo_simple.check-secret.domain=$DOMAIN(nt4_dc:local)
[536(2467)/578 at 31m48s] samba.wbinfo_simple.change-secret.domain=$DOMAIN(nt4_dc:local)
[537(2468)/578 at 31m49s] samba.wbinfo_simple.check-secret.domain=$DOMAIN(nt4_dc:local)
[538(2469)/578 at 31m49s] samba.wbinfo_simple.online-status.domain=$DOMAIN(nt4_dc:local)
[539(2470)/578 at 31m49s] samba.wbinfo_simple.domain-users(nt4_dc:local)
[540(2471)/578 at 31m49s] samba.wbinfo_simple.domain-groups(nt4_dc:local)
[541(2472)/578 at 31m49s] samba.wbinfo_simple.name-to-sid=$DC_USERNAME(nt4_dc:local)
[542(2473)/578 at 31m50s] samba.wbinfo_simple.name-to-sid=$DOMAIN/$DC_USERNAME(nt4_dc:local)
[543(2474)/578 at 31m50s] samba.wbinfo_simple.user-info=$DOMAIN/$DC_USERNAME(nt4_dc:local)
[544(2475)/578 at 31m50s] samba.wbinfo_simple.user-groups=$DOMAIN/$DC_USERNAME(nt4_dc:local)
[545(2476)/578 at 31m50s] samba.wbinfo_simple.authenticate=$DOMAIN/$DC_USERNAME%$DC_PASSWORD(nt4_dc:local)
[546(2477)/578 at 31m51s] samba.wbinfo_simple.allocate-uid(nt4_dc:local)
[547(2478)/578 at 31m51s] samba.wbinfo_simple.allocate-gid(nt4_dc:local)
[548(2479)/578 at 31m51s] samba.wbinfo_sids2xids.(nt4_dc:local)(nt4_dc:local)
[549(2480)/578 at 32m1s] samba.tests.ntlm_auth(nt4_dc:local)
[550(2493)/578 at 32m4s] samba.wbinfo_simple.ping(nt4_member:local)
[551(2494)/578 at 32m4s] samba.wbinfo_simple.separator(nt4_member:local)
[552(2495)/578 at 32m4s] samba.wbinfo_simple.own-domain(nt4_member:local)
[553(2496)/578 at 32m4s] samba.wbinfo_simple.all-domains(nt4_member:local)
[554(2497)/578 at 32m5s] samba.wbinfo_simple.trusted-domains(nt4_member:local)
[555(2498)/578 at 32m5s] samba.wbinfo_simple.domain-info=BUILTIN(nt4_member:local)
[556(2499)/578 at 32m5s] samba.wbinfo_simple.domain-info=$DOMAIN(nt4_member:local)
[557(2500)/578 at 32m5s] samba.wbinfo_simple.online-status(nt4_member:local)
[558(2501)/578 at 32m5s] samba.wbinfo_simple.online-status.domain=BUILTIN(nt4_member:local)
[559(2502)/578 at 32m6s] samba.wbinfo_simple.online-status.domain=$DOMAIN(nt4_member:local)
[560(2503)/578 at 32m6s] samba.wbinfo_simple.check-secret.domain=$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) -> 105
samba3.blackbox.net.rpc.conf(nt4_dc) -> 86
samba3.smb2.notify(nt4_dc) -> 85
samba3.smb2.compound_find(nt4_dc) -> 72
samba3.raw.search(nt4_dc) -> 63
samba3.rpc.samr.passwords.lockout(nt4_dc) -> 62
samba4.rpc.echo on ncacn_np with object(nt4_dc) -> 61
samba3.blackbox.net.local.conf(nt4_dc:local) -> 57
samba3.base.dir2(nt4_dc) -> 49
samba3.rpc.samr.passwords.pwdlastset(nt4_dc) -> 49
ERROR: test failed with exit code 1