I've seen plenty of GPU hangs with XCOM: Enemy Within. It's basically the same
game with a little more content, but not much.

The reproducibility is random. The hangs usually happen between 1 minutes and 8
hours.

In my case, this is the data I've been able to obtain:
- Reproduced on everything I was testing on: Hawaii (radeon), Tonga, Polaris11
(amdgpu)
- It occurs with many different shaders, among which there are a few very
simple ones. (no scratch or spills, a few ifs, no loops)
- Disabling HyperZ has no effect.
- Disabling CE has no effect.
- VM faults never occur.
- The hangs don't seem to have anything in common.

Action items:
- Reproduce the hang and do a hardware scan dump (it can only be done in the
AMD office AFAIK), and send it to hardware teams.