Comment # 8 on bug 107572 from Michel Dänzer

Reassigning this to Mesa for now; GFX ring hangs are indeed most likely
triggered by userspace issues.

Beware that there might be multiple separate issues with similar symptoms, but
different causes. It's better to track each issue separately until it's clear
that some of them have the same cause. In particular, those issues which can be
reliably reproduced with a certain application vs those which happen randomly.