autobuild[sn-devel-104]: intermittent test failure detected

[autobuild]

The autobuild test system (on sn-devel-104) 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-104/2016-08-30-1020/flakey.log

The samba build logs are available here:

   http://git.samba.org/autobuild.flakey.sn-devel-104/2016-08-30-1020/samba.stderr
   http://git.samba.org/autobuild.flakey.sn-devel-104/2016-08-30-1020/samba.stdout
  
The top commit at the time of the failure was:

commit 9395d958d6d5445082a369c54477e5f295df1974
Author: Volker Lendecke <vl at samba.org>
Date:   Mon Aug 29 11:35:39 2016 +0200

    pthreadpool: Signal job completion without the pool mutex
    
    This essentially reverts 1c4284c7395f23. We now call an alien function from
    within pthreadpool, and we should not hold a mutex during that call. The alien
    function could (and pthreadpool_tevent_job_signal actually does) lock a mutex.
    We can't guarantee proper lock ordering here, so in theory we could deadlock. I
    haven't seen it in the wild yet, but I could imagine that both _parent pieces
    in pthreadpool and tevent could trigger such a deadlock.
    
    Signed-off-by: Volker Lendecke <vl at samba.org>
    Reviewed-by: Jeremy Allison <jra at samba.org>
    
    Autobuild-User(master): Jeremy Allison <jra at samba.org>
    Autobuild-Date(master): Tue Aug 30 04:06:20 CEST 2016 on sn-devel-144