Hi from Reddit!

I don't see the attached umr output in the bugzilla report.  Though it looks
like Andrey (who is on my team) is looking at it.

It looks like an unhandled (or just bad) VM fault is locking up the GFX ring
and then a reset occurs which then brings up your lockdep.

So it's really two bugs (or 1 and a half)

1.  GPU hang due to VM fault
2.  GPU reset not working properly

The VM fault shouldn't lock up the GPU though even if it's the applications
fault (which does happen).  

The VM fault could be because of a bug in the kernel processing a CS, could be
from the UMD (mesa/etc), or could be from the application itself.