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-144/2018-04-13-0659/flakey.log

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

   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-04-13-0659/samba.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-04-13-0659/samba.stdout
  
The top commit at the time of the failure was:

commit 23d841036d3ba8f2c80bee4edc89049533524e68
Author: Volker Lendecke <vl at samba.org>
Date:   Wed Apr 11 08:01:38 2018 +0200

    dbwrap: Fix "use mmap = no"
    
    Mutexes require mmap.
    
    Signed-off-by: Volker Lendecke <vl at samba.org>
    Reviewed-by: Andreas Schneider <asn at samba.org>
    
    Autobuild-User(master): Volker Lendecke <vl at samba.org>
    Autobuild-Date(master): Thu Apr 12 23:04:18 CEST 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[518(2825)/831 at 40m59s] samba4.raw.streams(ad_dc_ntvfs)
[519(2838)/831 at 41m5s] samba4.raw.acls(ad_dc_ntvfs)
[520(2850)/831 at 41m10s] samba4.raw.composite(ad_dc_ntvfs)
[521(2854)/831 at 41m14s] samba4.raw.qfsinfo(ad_dc_ntvfs)
smbtorture 4.9.0pre1-DEVELOPERBUILD
Using seed 1523595480
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 = 40182 MB
check consistent free disk space
Inconsistent avail size in DSKATTR and ALLOCATION - size1=20306 size2=20307
free disk = 21292 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.rpc.samr.passwords.lockout on ncacn_np with (ad_dc_ntvfs) -> 225
samba4.rpc.samr.passwords.pwdlastset on ncacn_np with (ad_dc_ntvfs) -> 200
samba3.smbtorture_s3.vfs_aio_fork(simpleserver).RW2(simpleserver) -> 138
samba4.ldb.ldaps with options -U"$USERNAME%$PASSWORD"(ad_dc_ntvfs)(ad_dc_ntvfs) -> 112
samba4.raw.notify(ad_dc_ntvfs) -> 107
samba4.rpc.samlogon on ncacn_np with (ad_dc_ntvfs) -> 79
idmap.rfc2307(ad_member_rfc2307) -> 76
samba4.base.deny2(ad_dc_ntvfs) -> 57
samba4.base.deny1(ad_dc_ntvfs) -> 52
samba4.nbt.winsreplication(ad_dc_ntvfs) -> 51
ERROR: test failed with exit code 1