https://bugs.freedesktop.org/show_bug.cgi?id=90378
--- Comment #9 from Daniel Scharrer daniel@constexpr.org --- Hi Marek,
Looks like http://lists.freedesktop.org/archives/mesa-dev/2015-July/089950.html does help. With latest LLVM + Mesa + that patch series, glitches and lockups seem to be gone. I got one lockup when replaying L4D2-radeonsi.trace after rebuilding mesa, but could not reproduce it after reboot or in game (tested in L4D2, CS:GO and The Talos Principle).