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-144/2018-12-08-0104/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-144/2018-12-08-0104/samba-nt4.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-12-08-0104/samba-nt4.stdout
  
The top commit at the time of the failure was:

commit 353a947b4a983f6664391da6769b914d42612567
Author: Swen Schillig <swen at vnet.ibm.com>
Date:   Mon Mar 12 17:56:21 2018 +0100

    ctdb: Adding memory pool for queue callback
    
    The received packet is copied into a newly allocated memory chunk for further
    processing by the assigned callback. Once this is done, the memory is free'd.
    This is repeated for each received packet making the memory allocation / free
    an expensive task. To optimize this process, a memory pool is defined which
    is sized identically to the queue's buffer.
    During tests it could be seen that more than 95% of all messages were sized
    below the standard buffer_size of 1k.
    
    Signed-off-by: Swen Schillig <swen at vnet.ibm.com>
    Reviewed-by: Martin Schwenke <martin at meltin.net>
    Reviewed-by: Christof Schmitt <cs at samba.org>
    
    Autobuild-User(master): Christof Schmitt <cs at samba.org>
    Autobuild-Date(master): Fri Dec  7 23:27:16 CET 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[533(2464)/579 at 27m12s] samba.wbinfo_simple.online-status.domain=$DOMAIN(nt4_dc:local)
[534(2465)/579 at 27m12s] samba.wbinfo_simple.check-secret.domain=$DOMAIN(nt4_dc:local)
[535(2466)/579 at 27m12s] samba.wbinfo_simple.change-secret.domain=$DOMAIN(nt4_dc:local)
[536(2467)/579 at 27m12s] samba.wbinfo_simple.check-secret.domain=$DOMAIN(nt4_dc:local)
[537(2468)/579 at 27m12s] samba.wbinfo_simple.online-status.domain=$DOMAIN(nt4_dc:local)
[538(2469)/579 at 27m12s] samba.wbinfo_simple.domain-users(nt4_dc:local)
[539(2470)/579 at 27m12s] samba.wbinfo_simple.domain-groups(nt4_dc:local)
[540(2471)/579 at 27m12s] samba.wbinfo_simple.name-to-sid=$DC_USERNAME(nt4_dc:local)
[541(2472)/579 at 27m12s] samba.wbinfo_simple.name-to-sid=$DOMAIN/$DC_USERNAME(nt4_dc:local)
[542(2473)/579 at 27m13s] samba.wbinfo_simple.user-info=$DOMAIN/$DC_USERNAME(nt4_dc:local)
[543(2474)/579 at 27m13s] samba.wbinfo_simple.user-groups=$DOMAIN/$DC_USERNAME(nt4_dc:local)
[544(2475)/579 at 27m13s] samba.wbinfo_simple.authenticate=$DOMAIN/$DC_USERNAME%$DC_PASSWORD(nt4_dc:local)
[545(2476)/579 at 27m13s] samba.wbinfo_simple.allocate-uid(nt4_dc:local)
[546(2477)/579 at 27m13s] samba.wbinfo_simple.allocate-gid(nt4_dc:local)
[547(2478)/579 at 27m13s] samba.wbinfo_sids2xids.(nt4_dc:local)(nt4_dc:local)
[548(2479)/579 at 27m22s] samba.ntlm_auth.diagnostics(nt4_dc:local)(nt4_dc:local)
[549(2480)/579 at 27m22s] samba.ntlm_auth.(nt4_dc:local)(nt4_dc:local)
[550(2499)/579 at 27m24s] samba.wbinfo_simple.ping(nt4_member:local)
[551(2500)/579 at 27m24s] samba.wbinfo_simple.separator(nt4_member:local)
[552(2501)/579 at 27m24s] samba.wbinfo_simple.own-domain(nt4_member:local)
[553(2502)/579 at 27m24s] samba.wbinfo_simple.all-domains(nt4_member:local)
[554(2503)/579 at 27m24s] samba.wbinfo_simple.trusted-domains(nt4_member:local)
[555(2504)/579 at 27m24s] samba.wbinfo_simple.domain-info=BUILTIN(nt4_member:local)
[556(2505)/579 at 27m24s] samba.wbinfo_simple.domain-info=$DOMAIN(nt4_member:local)
[557(2506)/579 at 27m24s] samba.wbinfo_simple.online-status(nt4_member:local)
[558(2507)/579 at 27m25s] samba.wbinfo_simple.online-status.domain=BUILTIN(nt4_member:local)
[559(2508)/579 at 27m25s] samba.wbinfo_simple.online-status.domain=$DOMAIN(nt4_member:local)
[560(2509)/579 at 27m25s] samba.wbinfo_simple.check-secret.domain=$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) -> 106
samba3.smb2.notify(nt4_dc) -> 83
samba3.blackbox.net.rpc.conf(nt4_dc) -> 65
samba3.smb2.compound_find(nt4_dc) -> 64
samba3.raw.search(nt4_dc) -> 61
samba3.rpc.samr.passwords.lockout(nt4_dc) -> 61
samba4.rpc.echo on ncacn_np with object(nt4_dc) -> 60
samba3.rpc.samr.passwords.pwdlastset(nt4_dc) -> 49
samba3.raw.oplock(nt4_dc) -> 46
samba3.base.dir2(nt4_dc) -> 45
ERROR: test failed with exit code 1