Since it'd been a long time since I had tried, and another similar games that
used to crash doesn't seem to anymore (IGAU) I thought I'd try again.

Well the result is mitigated somehow.
The game still crashes, but this time it did not lock my computer. I was able
to go to a tty to look at dmesg, and eventually Xorg auto restarted (though I
didn't try to see if that session would worked, I prefered to restart the
machine completely).
I will attach the dmesg.

This was done on mesa-git, llvm-svn and linux 4.2.0.