Created attachment 106566 [details]
dmesg

I have an HD 7950 with latest graphic stack from git, including LLVM 3.6 git
from today. kernel is drm-next-3.18-wip from today
(3.17.0-rc5-drm-next-3.18-wip).
I was running some benchmarks
(http://openbenchmarking.org/result/1409197-SO-1407298SO78) while I noticed
sometimes the picture froze and then after a second or two it kept running the
benchmark ultra fast. when the benchmark finished I noticed lots of GPU faults
in dmesg: https://paste.lugons.org/show/5981/