https://review.gluster.org/19813
REVIEW: https://review.gluster.org/19813 (libglusterfs/timer: race condition and mem access after free) posted (#2) for review on master by Kaleb KEITHLEY
We have done some cleanup of timer functions in last year. Hopefully it should fix some of these.
This bug has not been seen in newer versions for some time. I'm closing it. If the problem persists, you can reopen this bug.