https://bugs.freedesktop.org/show_bug.cgi?id=107572
--- Comment #23 from madcatx@atlas.cz --- OK, I just tried Mesa 18.2 from the Copr suggested by Andrew but it does not fix the Witcher 3 for me. Unigine Superposition seems to have been fixed by the 4.18 kernel as I just ran it multiple times even at 4K profile and it always finished successfully. The only thing I cannot try easily is LLVM 7 because it breaks too much dependencies on my Fedora box.