autobuild[sn-devel-144]: intermittent test failure detected

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:

   http://git.samba.org/autobuild.flakey.sn-devel-144/2016-11-30-0422/flakey.log

The samba build logs are available here:

   http://git.samba.org/autobuild.flakey.sn-devel-144/2016-11-30-0422/samba.stderr
   http://git.samba.org/autobuild.flakey.sn-devel-144/2016-11-30-0422/samba.stdout
  
The top commit at the time of the failure was:

commit 275d9fc7d943048c5e580e656b6ad85b8fc6cc14
Author: Volker Lendecke <[email protected]>
Date:   Mon Nov 21 21:00:01 2016 +0100

    tdb: Fix mutexes on FreeBSD
    
    susv4 on mmap has the following snippet:
    
    > The state of synchronization objects such as mutexes, semaphores,
    > barriers, and conditional variables placed in shared memory mapped
    > with MAP_SHARED becomes undefined when the last region in any process
    > containing the synchronization object is unmapped.
    
    This means we can't keep the mutex mmap area unmapped at any point
    in time.
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=12455
    
    Signed-off-by: Volker Lendecke <[email protected]>
    Reviewed-by: Jeremy Allison <[email protected]>
    
    Autobuild-User(master): Jeremy Allison <[email protected]>
    Autobuild-Date(master): Tue Nov 29 23:59:52 CET 2016 on sn-devel-144