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:

   http://git.samba.org/autobuild.flakey.sn-devel-144/2017-01-06-1611/flakey.log

The samba build logs are available here:

   http://git.samba.org/autobuild.flakey.sn-devel-144/2017-01-06-1611/samba.stderr
   http://git.samba.org/autobuild.flakey.sn-devel-144/2017-01-06-1611/samba.stdout
  
The top commit at the time of the failure was:

commit 4635c22411a7864dd70703f854ec9844816e0294
Author: Amitay Isaacs <amitay at gmail.com>
Date:   Thu Jan 5 15:05:56 2017 +1100

    ctdb-tests: Do not attempt to unregister the join handler multiple times
    
    MSG_ID_SYNC is broadcast to each node when a MSG_ID_JOIN has been
    received from all nodes.  After MSG_ID_SYNC is successfully broadcast,
    the join handler is unregistered.  However, if another MSG_ID_JOIN is
    received before the join handler is unregistered then MSG_ID_SYNC is
    re-broadcast.  This results in multiple attempts to unregister the
    join handler.
    
    Once all MSG_ID_JOIN messages are received, unregister the join handler
    to ignore any extra MSG_ID_JOIN messages.  Also, make sure that while
    join handler is being unregistered, MSG_ID_JOIN messages are ignored.
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=12500
    
    Identified-by: Martin Schwenke <martin at meltin.net>
    Signed-off-by: Amitay Isaacs <amitay at gmail.com>
    Reviewed-by: Martin Schwenke <martin at meltin.net>
    
    Autobuild-User(master): Martin Schwenke <martins at samba.org>
    Autobuild-Date(master): Fri Jan  6 12:27:23 CET 2017 on sn-devel-144