https://bugs.freedesktop.org/show_bug.cgi?id=80419
--- Comment #150 from ArneJ arnej@arnej.de --- I also suffered a lot from this issue on my R9 270X. I was never able to go past the first tutorial mission because my PC hung during that mission.
Now I tried it again with mesa 13.0.3 and I was finally able to finish the first mission and also played 3 more missions after that without any issues. It looks like this issue is finally resolved.
Thanks a lot Marek!