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-144/2018-06-11-1227/flakey.log

The failure seems to be in the "samba-nt4" suite, whose build logs are available here:

   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-06-11-1227/samba-nt4.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-06-11-1227/samba-nt4.stdout
  
The top commit at the time of the failure was:

commit b9a323a27cff7cca09babdf6dea784e94e25dad7
Author: Douglas Bagnall <douglas.bagnall at catalyst.net.nz>
Date:   Fri Jun 8 15:36:39 2018 +1200

    python/drs_utils: fix repeated typo
    
    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): Sun Jun 10 21:41:33 CEST 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[146(790)/502 at 6m57s] samba3.base.rw1(nt4_dc)
[147(791)/502 at 6m57s] samba3.base.rw1(nt4_dc)
[148(792)/502 at 6m58s] samba3.base.rw1(nt4_dc)
[149(793)/502 at 6m58s] samba3.base.secleak(nt4_dc)
[150(794)/502 at 6m58s] samba3.base.tcon(nt4_dc)
[151(795)/502 at 6m58s] samba3.base.tcondev(nt4_dc)
[152(796)/502 at 6m59s] samba3.base.trans2(nt4_dc)
[153(797)/502 at 7m2s] samba3.base.unlink(nt4_dc)
[154(798)/502 at 7m2s] samba3.base.vuid(nt4_dc)
[155(799)/502 at 7m3s] samba3.base.xcopy(nt4_dc)
[156(800)/502 at 7m3s] samba3.base.samba3error(nt4_dc)
[157(801)/502 at 7m3s] samba3.raw.acls(nt4_dc)
[158(813)/502 at 7m5s] samba3.raw.acls nfs4acl_xattr-simple-40(nt4_dc)
[159(825)/502 at 7m8s] samba3.raw.acls nfs4acl_xattr-special-40(nt4_dc)
[160(837)/502 at 7m10s] samba3.raw.acls nfs4acl_xattr-simple-41(nt4_dc)
[161(849)/502 at 7m11s] samba3.raw.acls nfs4acl_xattr-xdr-40(nt4_dc)
[162(861)/502 at 7m13s] samba3.raw.acls nfs4acl_xattr-xdr-41(nt4_dc)
[163(873)/502 at 7m14s] samba3.raw.chkpath(nt4_dc)
[164(874)/502 at 7m15s] samba3.raw.close(nt4_dc)
[165(875)/502 at 7m15s] samba3.raw.composite(nt4_dc)
[166(879)/502 at 7m16s] samba3.raw.eas(nt4_dc)
[167(880)/502 at 7m17s] samba3.raw.lock(nt4_dc)
[168(893)/502 at 7m50s] samba3.raw.mkdir(nt4_dc)
[169(894)/502 at 7m50s] samba3.raw.mux(nt4_dc)
[170(895)/502 at 7m53s] samba3.raw.notify(nt4_dc)
TESTING CHANGE NOTIFY COMPLETION FILTERS
Testing mkdir
Testing create file
Testing unlink
Testing rmdir
Testing rename file
UNEXPECTED(failure): samba3.raw.notify.mask(nt4_dc)
REASON: Exception: Exception: ../source4/torture/raw/notify.c:838: notify.nttrans.out.num_changes was 1 (0x1), expected 2 (0x2): nchanges=1 expected=2 action=2 filter=0x00000002

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
samba3.blackbox.net.rpc.conf(nt4_dc) -> 44
samba3.raw.lock(nt4_dc) -> 33
samba3.blackbox.net.local.conf(nt4_dc:local) -> 32
samba3.smbtorture_s3.crypt_client(nt4_dc).OPLOCK1(nt4_dc) -> 30
samba3.base.lock(nt4_dc) -> 25
samba3.base.dir2(nt4_dc) -> 18
samba3.base.defer_open(nt4_dc) -> 16
samba3.smbtorture_s3.crypt_client(nt4_dc).OPLOCK2(nt4_dc) -> 11
samba3.smbtorture_s3.crypt_client(nt4_dc).IOCTL(nt4_dc) -> 11
samba3.blackbox.net.rpc.registry(nt4_dc) -> 10
ERROR: test failed with exit code 1