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-144/2018-09-27-0057/flakey.log

The failure seems to be in the "samba-py3" suite, whose build logs are available here:

   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-09-27-0057/samba-py3.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-09-27-0057/samba-py3.stdout
  
The top commit at the time of the failure was:

commit 5a73f904e192c44e304850287ac439d0b52f7be5
Author: Douglas Bagnall <douglas.bagnall at catalyst.net.nz>
Date:   Thu Sep 20 13:10:09 2018 +1200

    py3 kcc tests: mark verify test as flapping
    
    Signed-off-by: Douglas Bagnall <douglas.bagnall at catalyst.net.nz>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>
    
    Autobuild-User(master): Andrew Bartlett <abartlet at samba.org>
    Autobuild-Date(master): Wed Sep 26 23:40:58 CEST 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[28(193)/75 at 8m26s] samba.tests.emulate.traffic_packet.python3(ad_dc_ntvfs)
[29(282)/75 at 10m48s] samba.tests.blackbox.traffic_replay.python3(ad_dc_ntvfs)
[30(288)/75 at 11m8s] samba.tests.blackbox.traffic_learner.python3(ad_dc_ntvfs)
[31(290)/75 at 11m9s] samba.tests.blackbox.traffic_summary.python3(ad_dc_ntvfs)
[32(290)/75 at 11m10s] samba.tests.blackbox.smbcontrol.python3(ad_dc_ntvfs:local)
[33(292)/75 at 11m13s] samba.tests.blackbox.smbcontrol.python3(promoted_dc:local)
[34(294)/75 at 11m15s] samba4.schemaInfo.python(ad_dc_ntvfs).python3(ad_dc_ntvfs)
[35(296)/75 at 11m22s] samba.tests.dsdb_schema_attributes.python3(ad_dc_ntvfs:local)
[36(302)/75 at 11m47s] samba4.drs.replica_sync_rodc.python(rodc).python3(rodc:local)
[37(304)/75 at 12m52s] samba4.ldap.passwordsettings.python.python3(ad_dc_ntvfs)
[38(316)/75 at 14m2s] samba4.tombstone_reanimation.python.python3(ad_dc_ntvfs)
[39(328)/75 at 14m13s] samba.tests.upgradeprovisionneeddc.python3(ad_dc_ntvfs:local)
[40(339)/75 at 14m18s] samba.tests.samba_tool.rodc.python3(rodc:local)
[41(348)/75 at 15m13s] samba4.drs.ridalloc_exop.python(vampire_dc).python3(vampire_dc)
[42(359)/75 at 19m35s] samba4.drs.samba_tool_drs.python(vampire_dc).python3(vampire_dc:local)
[43(373)/75 at 23m7s] samba4.drs.samba_tool_drs_showrepl.python(vampire_dc).python3(vampire_dc:local)
Good, failed as expected after 0 rounds: '/memdisk/autobuild/fl/b189697/samba-py3/bin/samba-tool drs showrepl --summary -v --color=yes localvampiredc -USAMBADOMAIN/Administrator%locDCpass1'
UNEXPECTED(failure): samba4.drs.samba_tool_drs_showrepl.python(vampire_dc).python3.samba_tool_drs_showrepl.SambaToolDrsShowReplTests.test_samba_tool_showrepl_summary_forced_failure(vampire_dc:local)
REASON: Exception: Exception: Traceback (most recent call last):
  File "/memdisk/autobuild/fl/b189697/samba-py3/source4/torture/drs/python/samba_tool_drs_showrepl.py", line 311, in test_samba_tool_showrepl_summary_forced_failure
    (self.dc2, self.cmdline_creds))
samba.tests.BlackboxProcessError: Command '/memdisk/autobuild/fl/b189697/samba-py3/bin/samba-tool drs showrepl --summary -v --color=yes localvampiredc -USAMBADOMAIN/Administrator%locDCpass1'; exit status 255; stdout: 'b'''; stderr: 'b'ERROR(<type \'exceptions.IndexError\'>): uncaught exception - list index out of range\n  File "bin/python/samba/netcmd/__init__.py", line 183, in _run\n    return self.run(*args, **kwargs)\n  File "bin/python/samba/netcmd/drs.py", line 205, in run\n    return output_function()\n  File "bin/python/samba/netcmd/drs.py", line 251, in summary_output\n    return self.summary_output_handler("summary")\n  File "bin/python/samba/netcmd/drs.py", line 219, in summary_output_handler\n    local_data = self.get_local_repl_data()\n  File "bin/python/samba/netcmd/drs.py", line 300, in get_local_repl_data\n    d[\'dns name\'] = c_server_res[0]["dnsHostName"][0]\n''

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/memdisk/autobuild/fl/b189697/samba-py3/source4/torture/drs/python/samba_tool_drs_showrepl.py", line 325, in test_samba_tool_showrepl_summary_forced_failure
    e.cmd))
AssertionError: 'There are failing connections' not found in '' : stdout: ''
stderr: 'ERROR(<type \'exceptions.IndexError\'>): uncaught exception - list index out of range\n  File "bin/python/samba/netcmd/__init__.py", line 183, in _run\n    return self.run(*args, **kwargs)\n  File "bin/python/samba/netcmd/drs.py", line 205, in run\n    return output_function()\n  File "bin/python/samba/netcmd/drs.py", line 251, in summary_output\n    return self.summary_output_handler("summary")\n  File "bin/python/samba/netcmd/drs.py", line 219, in summary_output_handler\n    local_data = self.get_local_repl_data()\n  File "bin/python/samba/netcmd/drs.py", line 300, in get_local_repl_data\n    d[\'dns name\'] = c_server_res[0]["dnsHostName"][0]\n'
retcode: 255
message: None
cmd: '/memdisk/autobuild/fl/b189697/samba-py3/bin/samba-tool drs showrepl --summary -v --color=yes localvampiredc -USAMBADOMAIN/Administrator%locDCpass1'

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
samba4.drs.ridalloc_exop.python(vampire_dc).python3(vampire_dc) -> 262
samba4.drs.samba_tool_drs.python(vampire_dc).python3(vampire_dc:local) -> 212
samba.tests.emulate.traffic_packet.python3(ad_dc_ntvfs) -> 142
samba.tests.samba_tool.user.python3(ad_dc_ntvfs:local) -> 101
samba4.ldap.passwordsettings.python.python3(ad_dc_ntvfs) -> 71
samba.tests.samba_tool.user_wdigest.python3(ad_dc_ntvfs:local) -> 55
samba.tests.samba_tool.rodc.python3(rodc:local) -> 55
samba.tests.samba_tool.passwordsettings.python3(ad_dc_ntvfs:local) -> 39
samba.tests.samba_tool.group.python3(ad_dc_ntvfs:local) -> 29
samba.tests.samba_tool.computer.python3(ad_dc_ntvfs:local) -> 28
ERROR: test failed with exit code 1