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-144/2019-04-12-0622/flakey.log

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

   https://git.samba.org/autobuild.flakey.sn-devel-144/2019-04-12-0622/samba-schemaupgrade.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2019-04-12-0622/samba-schemaupgrade.stdout
  
The top commit at the time of the failure was:

commit fccd9c8c94e43f0aa77b9553981b6f96b5edfb07
Author: Volker Lendecke <vl at samba.org>
Date:   Thu Apr 11 13:03:30 2019 +0200

    utils: Move conn_tdb.c to utils/
    
    That's a wrapper that only smbstatus and net status use by now.
    
    Signed-off-by: Volker Lendecke <vl at samba.org>
    Reviewed-by: Jeremy Allison <jra at samba.org>
    
    Autobuild-User(master): Jeremy Allison <jra at samba.org>
    Autobuild-Date(master): Fri Apr 12 00:37:05 UTC 2019 on sn-devel-144

and the last 50 lines of the stdout log were:

Done with always replicated NC (base, config, schema)
Replicating DC=DomainDnsZones,DC=schema,DC=samba,DC=example,DC=com
Replicating DC=ForestDnsZones,DC=schema,DC=samba,DC=example,DC=com
Committing SAM database
STARTING SAMBA...
DONE (1722666)
Lookup failed - NT_STATUS_HOST_UNREACHABLE
Lookup failed - NT_STATUS_HOST_UNREACHABLE
Lookup failed - NT_STATUS_HOST_UNREACHABLE
Lookup failed - NT_STATUS_HOST_UNREACHABLE
Lookup failed - NT_STATUS_HOST_UNREACHABLE
Lookup failed - NT_STATUS_HOST_UNREACHABLE
Lookup failed - NT_STATUS_HOST_UNREACHABLE
Lookup failed - NT_STATUS_HOST_UNREACHABLE
Lookup failed - NT_STATUS_HOST_UNREACHABLE
Lookup failed - NT_STATUS_HOST_UNREACHABLE
Lookup failed - NT_STATUS_HOST_UNREACHABLE
Lookup failed - NT_STATUS_HOST_UNREACHABLE
Lookup failed - NT_STATUS_HOST_UNREACHABLE
Lookup failed - NT_STATUS_HOST_UNREACHABLE
Lookup failed - NT_STATUS_HOST_UNREACHABLE
Lookup failed - NT_STATUS_HOST_UNREACHABLE
Lookup failed - NT_STATUS_HOST_UNREACHABLE
Lookup failed - NT_STATUS_HOST_UNREACHABLE
Lookup failed - NT_STATUS_HOST_UNREACHABLE
Lookup failed - NT_STATUS_HOST_UNREACHABLE
SAMBA LOG of: LIVEUPGRADE2DC pid 1722666
samba version 4.11.0pre1-DEVELOPERBUILD started.
Copyright Andrew Tridgell and the Samba Team 1992-2019
binary_smbd_main: samba PID 1722666 was called with maxruntime 18000 - current ts 1555042830
binary_smbd_main: samba: using 'standard' process model
stream_setup_socket: Failed to listen on /memdisk/autobuild/fl/b1311061/samba-schemaupgrade/bin/ab/schemaupgrade_pair_dc/ncalrpc/np/protected_storage:0 - NT_STATUS_OBJECT_PATH_INVALID
stream_setup_named_pipe(pipe=\pipe\protected_storage) failed - NT_STATUS_OBJECT_PATH_INVALID
task_server_terminate: task_server_terminate: [dcerpc: Failed to initialise end points]
Attempting to autogenerate TLS self-signed keys for https for hostname 'LIVEUPGRADE2DC.schema.samba.example.com'
samba_terminate: samba_terminate of samba 1722666: dcerpc: Failed to initialise end points
TLS self-signed keys generated OK
[1(0)/11 at 0s] samba.tests.samba_tool.schema(schemaupgrade_dc:local)
ERROR: Testsuite[samba.tests.samba_tool.schema(schemaupgrade_dc:local)]
REASON: unable to set up environment schemaupgrade_dc: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.samba_tool.schema(schemaupgrade_dc:local) -> 0
ERROR: test failed with exit code 1