It happens randomly, usually when lots of things are happening, like during settlement takeovers. The screen freezes, sound stops, and only the magic sysrq keys are working.
GPU is Radeon R9 270x, Linux 4.3.3, libdrm 2.4.66, Mesa 11.1.1, wine 1.7.55. I also tried gallium nine, and that made it more unstable, it crashes even when just riding around. BTW nine doesn't help with the horrible performance (5-15 fps), but it introduces several graphical glitches.
I tried this again with current sw stack (kernel 4.8.13, libdrm 2.74, mesa 13.1-dev, wine 2.0rc2), and the game ran for 1 hour without crashing the machine, so I guess this is fixed. The performance feels much worse now (around 2-5fps), but with nine the game is playable (but it doesn't draw shadows, and crashes very often).
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