ctdb intermittent startup failure "Timed out waiting for lttng-sessiond"

[Steve French]

I noticed that ctdb (Samba 4.4-stable) frequently fails to start
automatically on some of our systems.    RHEL 7.2 lttng problem?  "Timed
out waiting for lttng-sessiond"   Any ideas what this means or how to
workaround it? Anyone recognize this?  I see similar complaints from others
(https://lists.lttng.org/pipermail/lttng-dev/2014-April/022763.html)

2016/08/01 09:55:35.916683 [15896]: CTDB starting on node

2016/08/01 09:55:35.916730 [15896]: Recovery lock file set to "". Disabling
recovery lock checking

2016/08/01 09:55:35.921198 [16507]: Starting CTDBD (Version 4.4.5-UNKNOWN)
as PID: 16507

2016/08/01 09:55:35.921266 [16507]: Created PID file /run/ctdb/ctdbd.pid

2016/08/01 09:55:35.921284 [16507]: Set real-time scheduler priority

2016/08/01 09:55:35.921398 [16507]: Set runstate to INIT (1)

2016/08/01 09:55:35.921735 [16507]: Set event helper to
"/usr/libexec/ctdb/ctdb_event_helper"

2016/08/01 09:55:38.933533 [16507]: libust[16518/16518]: Error: Timed out
waiting for lttng-sessiond (in lttng_ust_init() at lttng-ust-comm.c:1532)

2016/08/01 16:55:02.103492 [16507]: No event for 25162 seconds!

2016/08/01 16:55:02.103538 [16507]: libust[16768/16768]: Error: Timed out
waiting for lttng-sessiond (in lttng_ust_init() at lttng-ust-comm.c:1532)

2016/08/01 16:55:02.103586 [16507]: Event script '01.reclock init ' timed
out after 25162.8s, pid: 16768

2016/08/01 16:55:02.103807 [16507]: ../ctdb/server/eventscript.c:912
eventscript for 'init' timedout. Immediately banning ourself for 300 seconds

2016/08/01 16:55:02.103826 [16507]: ctdb exiting with error: Failed to run
init event

2016/08/01 16:55:02.103834 [16507]:

2016/08/01 16:55:02.103842 [16507]: CTDB daemon shutting down

2016/08/01 16:55:02.111101 [16507]: Removed PID file /run/ctdb/ctdbd.pid

-- 
Thanks,

Steve