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-144/2019-04-11-0637/flakey.log

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

   https://git.samba.org/autobuild.flakey.sn-devel-144/2019-04-11-0637/samba-ad-dc-ntvfs.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2019-04-11-0637/samba-ad-dc-ntvfs.stdout
  
The top commit at the time of the failure was:

commit 49b77d8df2d7113ac7ddb75e78de6628933ff852
Author: Andrew Bartlett <abartlet at samba.org>
Date:   Fri Apr 5 10:46:50 2019 +1300

    ldb_kv: Skip @ records early in a search full scan
    
    @ records like @IDXLIST are only available via a base search on the specific name
    but the method by which they were excluded was expensive, after the unpack the
    DN is exploded and ldb_match_msg_error() would reject it for failing to match the
    scope.
    
    This uses the fact that @ records have the DN=@ prefix on their TDB/LMDB key
    to quickly exclude them from consideration.
    
    Based on analysis by Garming Sam.
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=13893
    
    Signed-off-by: Andrew Bartlett <abartlet at samba.org>
    Reviewed-by: Garming Sam <garming at catalyst.net.nz>
    
    Autobuild-User(master): Andrew Bartlett <abartlet at samba.org>
    Autobuild-Date(master): Wed Apr 10 06:23:39 UTC 2019 on sn-devel-144

and the last 50 lines of the stdout log were:

[131(338)/252 at 13m17s] samba4.raw.streams(ad_dc_ntvfs)
[132(351)/252 at 13m27s] samba4.raw.acls(ad_dc_ntvfs)
[133(363)/252 at 13m36s] samba4.raw.composite(ad_dc_ntvfs)
[134(367)/252 at 13m48s] samba4.raw.qfsinfo(ad_dc_ntvfs)
smbtorture 4.11.0pre1-DEVELOPERBUILD
Using seed 1554957448
Running level DSKATTR
Running level ALLOCATION
Running level VOLUME
Running level VOLUME_INFO
Running level SIZE_INFO
Running level DEVICE_INFO
Running level ATTRIBUTE_INFO
Running level UNIX_INFO
Running level VOLUME_INFORMATION
Running level SIZE_INFORMATION
Running level DEVICE_INFORMATION
Running level ATTRIBUTE_INFORMATION
Running level QUOTA_INFORMATION
Running level FULL_SIZE_INFORMATION
check for correct aliases
volume_info.volume_name = 'tmp'
attribute_info.fs_type = 'NTFS'
check for consistent disk sizes
total disk = 42275 MB
check consistent free disk space
Inconsistent avail size in DSKATTR and ALLOCATION - size1=25040 size2=25038
free disk = 26256 MB
volume info consistency
check for non-zero unknown fields
check for correct termination
UNEXPECTED(error): samba4.raw.qfsinfo.qfsinfo(ad_dc_ntvfs)
REASON: Exception: Exception: Unknown error/failure. Missing torture_fail() or torture_assert_*() call?

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.raw.notify(ad_dc_ntvfs) -> 114
samba4.nbt.winsreplication(ad_dc_ntvfs) -> 74
samba4.base.deny2(ad_dc_ntvfs) -> 59
samba4.base.deny1(ad_dc_ntvfs) -> 53
samba4.raw.oplock(ad_dc_ntvfs) -> 52
samba4.base.createx_sharemodes_dir(ad_dc_ntvfs) -> 39
samba4.base.delete(ad_dc_ntvfs) -> 27
samba4.base.lock(ad_dc_ntvfs) -> 26
samba4.ldb.ldapi with options -U"$USERNAME%$PASSWORD"(ad_dc_ntvfs:local)(ad_dc_ntvfs:local) -> 25
samba4.raw.lock(ad_dc_ntvfs) -> 21
ERROR: test failed with exit code 1