https://bugs.freedesktop.org/show_bug.cgi?id=84648
--- Comment #2 from Michel Dänzer michel@daenzer.net --- (In reply to Mathieu Belanger from comment #0)
A old kernel with a new Mesa and a new Kernel with a old Mesa recreate the problem.
Hmm, that's weird. Can you try bisecting Mesa with an old kernel and/or bisecting the kernel with old Mesa?