autobuild[sn-devel-184]: intermittent test failure detected

[autobuild]

The autobuild test system (on sn-devel-184) 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-184/2019-04-24-0945/flakey.log

The failure seems to be in the "samba-ad-dc-2" suite, whose build logs are available here:

   https://git.samba.org/autobuild.flakey.sn-devel-184/2019-04-24-0945/samba-ad-dc-2.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-184/2019-04-24-0945/samba-ad-dc-2.stdout
  
The top commit at the time of the failure was:

commit 92f30f91e44dba7e85d56279bbbe3662d0b5faeb
Author: Lutz Justen <ljusten at google.com>
Date:   Mon Apr 22 10:22:16 2019 -0700

    waf: build: Respect --disable-python for third_party modules
    
    Skips installation of samba/third_party stuff into the python directory if
    --disable-python is set.
    
    Added test after install that confirms no python modules installed.
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=13905
    
    Signed-off-by: Lutz Justen <ljusten at google.com>
    Reviewed-by: Jeremy Allison <jra at samba.org>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>
    
    Autobuild-User(master): Andrew Bartlett <abartlet at samba.org>
    Autobuild-Date(master): Wed Apr 24 07:32:31 UTC 2019 on sn-devel-184

and the last 50 lines of the stdout log were:

Waiting for dns_update_cache to be filled...
Waiting for dns_update_cache to be filled...
Waiting for dns_update_cache to be filled...
Waiting for dns_update_cache to be filled...
Waiting for dns_update_cache to be filled...
SAMBA LOG of: RODC pid 787770
samba version 4.11.0pre1-DEVELOPERBUILD started.
Copyright Andrew Tridgell and the Samba Team 1992-2019
binary_smbd_main: samba PID 787770 was called with maxruntime 18000 - current ts 1556099035
binary_smbd_main: samba: using 'standard' process model
Attempting to autogenerate TLS self-signed keys for https for hostname 'RODC.samba.example.com'
/memdisk/autobuild/fl/b3966749/samba-ad-dc-2/bin/winbindd: Failed to create /m/autobuild/fl/b3966749/prefix/samba-ad-dc-2/var/cores for user 0 with mode 0700
/memdisk/autobuild/fl/b3966749/samba-ad-dc-2/bin/winbindd: Unable to setup corepath for winbindd: No such file or directory
/memdisk/autobuild/fl/b3966749/samba-ad-dc-2/bin/winbindd: Failed to create /m/autobuild/fl/b3966749/prefix/samba-ad-dc-2/var/cores for user 0 with mode 0700
/memdisk/autobuild/fl/b3966749/samba-ad-dc-2/bin/winbindd: Unable to setup corepath for winbindd: No such file or directory
/memdisk/autobuild/fl/b3966749/samba-ad-dc-2/bin/winbindd: winbindd version 4.11.0pre1-DEVELOPERBUILD started.
/memdisk/autobuild/fl/b3966749/samba-ad-dc-2/bin/winbindd: Copyright Andrew Tridgell and the Samba Team 1992-2019
python3: Traceback (most recent call last):
python3:   File "/memdisk/autobuild/fl/b3966749/samba-ad-dc-2/source4/scripting/bin/samba_dnsupdate", line 924, in <module>
python3:     call_rodc_update(d)
python3:   File "/memdisk/autobuild/fl/b3966749/samba-ad-dc-2/source4/scripting/bin/samba_dnsupdate", line 699, in call_rodc_update
python3:     rodc_dns_update(d, t, op)
python3:   File "/memdisk/autobuild/fl/b3966749/samba-ad-dc-2/source4/scripting/bin/samba_dnsupdate", line 639, in rodc_dns_update
python3:     w = cached_irpc_wb(lp)
python3:   File "/memdisk/autobuild/fl/b3966749/samba-ad-dc-2/source4/scripting/bin/samba_dnsupdate", line 617, in cached_irpc_wb
python3:     irpc_wb = winbind.winbind("irpc:winbind_server", lp)
python3: samba.NTSTATUSError: (3221225645, 'The named pipe is not in the connected or closing state.')
/memdisk/autobuild/fl/b3966749/samba-ad-dc-2/bin/winbindd: initialize_winbindd_cache: clearing cache and re-creating with version number 2
/memdisk/autobuild/fl/b3966749/samba-ad-dc-2/bin/winbindd: daemon_ready: daemon 'winbindd' finished starting up and ready to serve connections
dnsupdate_nameupdate_done: Failed DNS update with exit code 1
TLS self-signed keys generated OK
Doing a full scan on DC=ForestDnsZones,DC=samba,DC=example,DC=com and looking for deleted objects
Doing a full scan on DC=DomainDnsZones,DC=samba,DC=example,DC=com and looking for deleted objects
Doing a full scan on DC=samba,DC=example,DC=com and looking for deleted objects
Doing a full scan on CN=Configuration,DC=samba,DC=example,DC=com and looking for deleted objects
samba_parent_shutdown: samba_shutdown of samba 787770: from 807025
[1(0)/66 at 0s] samba.tests.dns(rodc:local)
ERROR: Testsuite[samba.tests.dns(rodc:local)]
REASON: unable to set up environment rodc:local - exiting



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

A summary with detailed information can be found in:
  ./bin/ab/summary
TOP 10 slowest tests
samba.tests.dns(rodc:local) -> 0
ERROR: test failed with exit code 1
Makefile:16: recipe for target 'test' failed