Comment 20 for bug 1508767

1) Can you test an lts-wily kernel which is in our CKT PPA:
https://launchpad.net/~canonical-kernel-team/+archive/ubuntu/ppa/+packages

2) How many times a day does this actually occur? Does this only occur on nova nodes? Are they fairly loaded in terms of memory when this occurs?

3) Another potential test would be to disable KSM to see if that's the culprit. As root:
 echo 0 > /sys/kernel/mm/ksm/run

4) Can you get the machine to generate userspace core dumps when programs segv?
 ulimit -c unlimited

I can also generate a kernel which BUG()s on _exception with code 30001, which may give us more insight. But the above information might help.