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-184/2019-05-19-2150/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-184/2019-05-19-2150/samba-nt4.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-184/2019-05-19-2150/samba-nt4.stdout
  
The top commit at the time of the failure was:

commit 594676c8b8f9138c013871a5da01fca67e1aa282
Author: Rikard Falkeborn <rikard.falkeborn at gmail.com>
Date:   Thu May 16 21:43:46 2019 +0200

    s3: torture: Fix return values
    
    Torture tests should return true on success and false on failure.
    Returning -1 is the same as returning true and returning 0 is the same
    as returning false. Change the return values to true and false to fix
    the return values.
    
    Detected by the help of cppcheck.
    
    Signed-off-by: Rikard Falkeborn <rikard.falkeborn at gmail.com>
    Reviewed-by: Ralph Böhme <slow at samba.org>
    Reviewed-by: Jeremy Allison <jra at samba.org>
    
    Autobuild-User(master): Jeremy Allison <jra at samba.org>
    Autobuild-Date(master): Sun May 19 18:48:01 UTC 2019 on sn-devel-184

and the last 50 lines of the stdout log were:

[162(862)/589 at 9m25s] samba3.base.tcon(nt4_dc)
[163(863)/589 at 9m26s] samba3.base.tcondev(nt4_dc)
[164(864)/589 at 9m26s] samba3.base.trans2(nt4_dc)
[165(865)/589 at 9m29s] samba3.base.unlink(nt4_dc)
[166(866)/589 at 9m30s] samba3.base.vuid(nt4_dc)
[167(867)/589 at 9m30s] samba3.base.xcopy(nt4_dc)
[168(868)/589 at 9m30s] samba3.base.samba3error(nt4_dc)
[169(869)/589 at 9m31s] samba3.raw.acls(nt4_dc)
[170(881)/589 at 9m34s] samba3.raw.acls nfs4acl_xattr-simple-40(nt4_dc)
[171(893)/589 at 9m37s] samba3.raw.acls nfs4acl_xattr-special-40(nt4_dc)
[172(905)/589 at 9m40s] samba3.raw.acls nfs4acl_xattr-simple-41(nt4_dc)
[173(917)/589 at 9m42s] samba3.raw.acls nfs4acl_xattr-xdr-40(nt4_dc)
[174(929)/589 at 9m45s] samba3.raw.acls nfs4acl_xattr-xdr-41(nt4_dc)
[175(941)/589 at 9m47s] samba3.raw.acls nfs4acl_xattr-nfs-40(nt4_dc)
[176(953)/589 at 9m50s] samba3.raw.acls nfs4acl_xattr-nfs-41(nt4_dc)
[177(965)/589 at 9m52s] samba3.raw.chkpath(nt4_dc)
[178(966)/589 at 9m52s] samba3.raw.close(nt4_dc)
[179(967)/589 at 9m53s] samba3.raw.composite(nt4_dc)
[180(971)/589 at 9m55s] samba3.raw.eas(nt4_dc)
[181(972)/589 at 9m55s] samba3.raw.lock(nt4_dc)
[182(985)/589 at 10m29s] samba3.raw.mkdir(nt4_dc)
[183(986)/589 at 10m29s] samba3.raw.mux(nt4_dc)
[184(987)/589 at 10m32s] samba3.raw.notify(nt4_dc)
TESTING CHANGE NOTIFY ON DIRECTORIES
Testing notify cancel
Testing notify mkdir
Testing notify rmdir
Testing notify mkdir - rmdir - mkdir - rmdir
Testing buffered notify on create of 10 files
Testing notify on unlink for the first file
UNEXPECTED(failure): samba3.raw.notify.dir(nt4_dc)
REASON: Exception: Exception: ../../source4/torture/raw/notify.c:223: notify.nttrans.out.num_changes was 9 (0x9), expected 10 (0xA): wrong number of changes

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.base.dir2(nt4_dc) -> 54
samba3.blackbox.net.rpc.conf(nt4_dc) -> 54
samba3.blackbox.net.local.conf(nt4_dc:local) -> 39
samba3.raw.lock(nt4_dc) -> 33
samba3.smbtorture_s3.crypt_client.OPLOCK1(nt4_dc) -> 30
samba3.base.lock(nt4_dc) -> 27
samba3.smbtorture_s3.crypt_client.LOCK1(nt4_dc) -> 17
samba3.base.defer_open(nt4_dc) -> 17
samba3.blackbox.smbclient_s3.SMB3.plain (nt4_member) member creds(nt4_member) -> 14
samba3.blackbox.smbclient_s3.NT1.crypt (nt4_dc)(nt4_dc) -> 13
ERROR: test failed with exit code 1
Makefile:16: recipe for target 'test' failed