https://bugs.freedesktop.org/show_bug.cgi?id=69723
--- Comment #49 from Michel Dänzer michel@daenzer.net --- (In reply to comment #48)
The display went black a couple of time and according to dmesg/journal, it was related to texelFetch segfaulting in llvm [...]
'The display went black a couple of time' sounds like GPU resets after lockups, which are unlikely to be directly related to segfaulting piglit tests FWIW.