Comment 8 for bug 1318551

We're not using virtualbox. What I traced back was that it always crashes in two functions.

update_cfs_shares() + pick_next_task_fair()

I think it has to do with compiler bug (gcc 4.9.0)
Are newer Ubuntu kernels built with that broken version probably?
I installed another kernel yesterday (pf-kernel 3.15-pf4). No crashs anymore.

So probably it has to do with this: https://lkml.org/lkml/2014/7/24/584