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-144/2018-07-22-1359/flakey.log

The failure seems to be in the "samba" suite, whose build logs are available here:

   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-07-22-1359/samba.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-07-22-1359/samba.stdout
  
The top commit at the time of the failure was:

commit 582ce5d6b599516d6d8d619529a2aa809139a175
Author: Jeremy Allison <jra at samba.org>
Date:   Wed Jul 18 15:49:29 2018 -0700

    s3: smbd: Fix AIX sendfile() for SMB2. Ensure we don't spin on EAGAIN.
    
    For SMB2 the socket is set non-blocking. Ensure sendfile()
    calls complete if they return EAGAIN by saving the socket state,
    setting it blocking, doing the sendfile until completion and then
    restoring the socket state.
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=13537
    
    Signed-off-by: Jeremy Allison <jra at samba.org>
    Reviewed-by: Volker Lendecke <vl at samba.org>
    
    Autobuild-User(master): Volker Lendecke <vl at samba.org>
    Autobuild-Date(master): Fri Jul 20 15:14:24 CEST 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[818(5110)/889 at 1h16m42s] samba4.rpc.echo(renamedc:local)
[819(5120)/889 at 1h16m46s] samba4.rpc.echo.testallowed(renamedc:local)
[820(5130)/889 at 1h16m49s] samba4.rpc.echo.testdenied(renamedc:local)
[821(5140)/889 at 1h16m52s] samba4.blackbox.smbclient(renamedc:local)(renamedc:local)
[822(5142)/889 at 1h16m53s] samba4.rpc.echo(labdc)
[823(5152)/889 at 1h16m57s] samba4.rpc.echo(labdc:local)
[824(5162)/889 at 1h17m0s] samba4.rpc.echo.testallowed(labdc:local)
[825(5172)/889 at 1h17m0s] samba4.rpc.echo.testdenied(labdc:local)
[826(5182)/889 at 1h17m0s] samba4.blackbox.smbclient(labdc:local)(labdc:local)
[827(5184)/889 at 1h17m1s] samba.tests.samba_tool.rodc(rodc:local)
[828(5193)/889 at 1h17m31s] samba.blackbox.rpcclient_samlogon(rodc:local)
[829(5197)/889 at 1h17m32s] samba.blackbox.rpcclient_samlogon_testallowed(rodc:local)
[830(5201)/889 at 1h17m33s] samba.blackbox.rpcclient_samlogon_testdenied(rodc:local)
[831(5205)/889 at 1h17m33s] samba4.drs.ridalloc_exop.python(vampire_dc)(vampire_dc)
[832(5216)/889 at 1h22m45s] samba4.drs.samba_tool_drs.python(vampire_dc)(vampire_dc:local)
[833(5230)/889 at 1h25m58s] samba4.drs.samba_tool_drs_showrepl.python(vampire_dc)(vampire_dc:local)
[834(5234)/889 at 1h26m9s] samba4.drs.replica_sync.python(vampire_dc)(vampire_dc:local)
[835(5250)/889 at 1h29m51s] samba4.drs.delete_object.python(vampire_dc)(vampire_dc)
[836(5252)/889 at 1h30m1s] samba4.drs.fsmo.python(vampire_dc)(vampire_dc)
[837(5257)/889 at 1h30m19s] samba4.drs.repl_move.python(vampire_dc)(vampire_dc)
[838(5278)/889 at 1h32m12s] samba4.drs.getnc_exop.python(vampire_dc)(vampire_dc)
[839(5290)/889 at 1h32m33s] samba4.drs.getnc_unpriv.python(vampire_dc)(vampire_dc)
[840(5294)/889 at 1h32m39s] samba4.drs.linked_attributes_drs.python(vampire_dc)(vampire_dc)
[841(5297)/889 at 1h32m41s] samba4.drs.link_conflicts.python(vampire_dc)(vampire_dc)
[842(5309)/889 at 1h38m58s] samba4.drs.samba_tool_drs.python(promoted_dc)(promoted_dc:local)
UNEXPECTED(error): samba4.drs.samba_tool_drs.python(promoted_dc).samba_tool_drs.SambaToolDrsTests.test_samba_tool_kcc(promoted_dc:local)
REASON: Exception: Exception: Traceback (most recent call last):
  File "/memdisk/autobuild/fl/b2391554/samba/source4/torture/drs/python/samba_tool_drs.py", line 80, in test_samba_tool_kcc
    self.cmdline_creds))
  File "bin/python/samba/tests/__init__.py", line 390, in check_output
    raise BlackboxProcessError(retcode, line, stdoutdata, stderrdata)
BlackboxProcessError: Command '/memdisk/autobuild/fl/b2391554/samba/bin/samba-tool drs kcc localdc -USAMBADOMAIN/Administrator%locDCpass1'; exit status 255; stdout: ''; stderr: 'ERROR(runtime): DsExecuteKCC failed - (3221356597, 'The operation cannot be performed.')
'

FAILED (0 failures, 1 errors and 0 unexpected successes in 0 testsuites)

A summary with detailed information can be found in:
  ./bin/ab/summary
TOP 10 slowest tests
samba4.ldap.rodc_rwdc.python(rodc)(rodc:local) -> 453
samba4.drs.link_conflicts.python(vampire_dc)(vampire_dc) -> 377
samba4.drs.ridalloc_exop.python(vampire_dc)(vampire_dc) -> 311
samba4.ldap.vlv.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 233
samba4.rpc.samr.passwords.lockout on ncacn_np with (ad_dc_ntvfs) -> 225
samba4.drs.replica_sync.python(vampire_dc)(vampire_dc:local) -> 222
samba4.rpc.samr.passwords.pwdlastset on ncacn_np with (ad_dc_ntvfs) -> 200
samba4.drs.samba_tool_drs.python(vampire_dc)(vampire_dc:local) -> 193
samba4.ldap.password_lockout.python(ad_dc_ntvfs)(ad_dc_ntvfs) -> 169
samba3.smbtorture_s3.vfs_aio_fork(simpleserver).RW2(simpleserver) -> 135
ERROR: test failed with exit code 1