Comment 10 for bug 2043640

This is the same issue as https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2045573

Here is a commit that fixes the issue by changing default pre-emption policy since the kernel can't know about your mesa version.

https://github.com/torvalds/linux/commit/d6a57588666301acd9d42d3b00d74240964f07f6