https://bugs.freedesktop.org/show_bug.cgi?id=83205
--- Comment #2 from Marek Olšák maraeo@gmail.com --- Please apply both patches mentioned above and test again. If it still hangs, please record a trace file with apitrace (the recording can be done with hyperz disabled, but please make it as small as possible).
https://github.com/apitrace/apitrace