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-184/2019-06-15-2133/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-184/2019-06-15-2133/samba-schemaupgrade.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-184/2019-06-15-2133/samba-schemaupgrade.stdout
  
The top commit at the time of the failure was:

commit fef8ec20d0f591f2e531a649108ca83c5a4fd744
Author: Gary Lockyer <gary at catalyst.net.nz>
Date:   Thu Jun 13 08:49:16 2019 +1200

    lib ldb ldb_key_value: csbuild unused parm ldb_kv
    
    Fixes csbuild error.
    
    Error: COMPILER_WARNING:
    lib/ldb/ldb_key_value/ldb_kv_search.c: scope_hint: In
    function ‘search_func’ lib/ldb/ldb_key_value/ldb_kv_search.c:308:47:
    warning: unused parameter ‘ldb_kv’ [-Wunused-parameter]
    
    Signed-off-by: Gary Lockyer <gary at catalyst.net.nz>
    Reviewed-by: Andreas Schneider <asn at samba.org>
    
    Autobuild-User(master): Andreas Schneider <asn at cryptomilk.org>
    Autobuild-Date(master): Thu Jun 13 08:27:12 UTC 2019 on sn-devel-184

and the last 50 lines of the stdout log were:

Applying Sch62.ldf updates...
5 changes applied
Applying Sch63.ldf updates...
5 changes applied
Applying Sch64.ldf updates...
6 changes applied
Applying Sch65.ldf updates...
22 changes applied
Applying Sch66.ldf updates...
5 changes applied
Applying Sch67.ldf updates...
5 changes applied
Applying Sch68.ldf updates...
30 changes applied
Applying Sch69.ldf updates...
4 changes applied
Schema successfully updated
Replicate from liveupgrade1dc to liveupgrade2dc was successful.
[1(0)/11 at 0s] samba.tests.samba_tool.schema(schema_dc:local)
[2(4)/11 at 2m25s] samba4.schemaInfo.python(schema_dc:local)(schema_dc:local)
[3(7)/11 at 2m31s] samba.tests.dsdb_schema_attributes(schema_dc:local)
[4(13)/11 at 2m47s] samba4.ldap_schema.python(schema_dc)(schema_dc)
[5(39)/11 at 3m26s] samba4.ldap.possibleInferiors.python(schema_dc)(schema_dc)
[6(313)/11 at 3m28s] samba4.ldap.secdesc.python(schema_dc)(schema_dc)
[7(396)/11 at 6m14s] samba4.ldap.acl.python(schema_dc)(schema_dc)
[8(449)/11 at 7m17s] samba4.ldap.passwords.python(schema_dc)(schema_dc)
[9(467)/11 at 7m38s] samba4.drs.samba_tool_drs.python(schema_pair_dc)(schema_pair_dc:local)
UNEXPECTED(error): samba4.drs.samba_tool_drs.python(schema_pair_dc).samba_tool_drs.SambaToolDrsTests.test_samba_tool_replicate(schema_pair_dc:local)
REASON: Exception: Exception: Traceback (most recent call last):
  File "/memdisk/autobuild/fl/b2636581/samba-schemaupgrade/source4/torture/drs/python/samba_tool_drs.py", line 101, in test_samba_tool_replicate
    self.cmdline_creds))
  File "bin/python/samba/tests/__init__.py", line 448, in check_output
    raise BlackboxProcessError(retcode, line, stdoutdata, stderrdata)
samba.tests.BlackboxProcessError: Command 'python3 /memdisk/autobuild/fl/b2636581/samba-schemaupgrade/bin/samba-tool drs replicate liveupgrade1dc liveupgrade2dc DC=schema,DC=samba,DC=example,DC=com -USCHEMADOMAIN/Administrator%locDCpass1'; shell True; exit status 255; stdout: 'b'''; stderr: 'b'ERROR(<class \'samba.drs_utils.drsException\'>): DsReplicaSync failed - drsException: DsReplicaSync failed (58, \'WERR_BAD_NET_RESP\')\n  File "bin/python/samba/netcmd/drs.py", line 574, in run\n    drs_utils.sendDsReplicaSync(server_bind, server_bind_handle, source_dsa_guid, NC, req_options)\n  File "bin/python/samba/drs_utils.py", line 92, in sendDsReplicaSync\n    raise drsException("DsReplicaSync failed %s" % estr)\n''

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.secdesc.python(schema_dc)(schema_dc) -> 166
samba4.ldap.acl.python(schema_dc)(schema_dc) -> 62
samba4.ldap_schema.python(schema_dc)(schema_dc) -> 39
samba4.ldap.passwords.python(schema_dc)(schema_dc) -> 22
samba.tests.dsdb_schema_attributes(schema_dc:local) -> 17
samba.tests.samba_tool.schema(schema_dc:local) -> 10
samba4.schemaInfo.python(schema_dc:local)(schema_dc:local) -> 6
samba4.ldap.possibleInferiors.python(schema_dc)(schema_dc) -> 2
ERROR: test failed with exit code 1
Makefile:16: recipe for target 'test' failed