Today I gave the latest Padoka (git1600721124400.4f89cf4) a try during debugging Overlord. I got a screen corruption followed by a hang. Just as I was about to reach for the SysRq keys, Xorg restarted, and seemed to operate as normal - except I was now on llvmpipe instead. Quite an amount of kernel log was generated, and some relevant looking info in Xorg.log too. They are attached here.