https://bugs.freedesktop.org/show_bug.cgi?id=104285
--- Comment #9 from Gregor Münch gr.muench@gmail.com --- (In reply to Alex Vorobyev from comment #8)
I think it's not the same bug. CS:GO works on my system as it should, while SCS games still have broken shadows.
So you also checked that specific map?
Anyway, its either a bug which is already fixed in Mesa git or fixed in LLVM 6.0. In both cases devs will wait till users upgrade to mesa 18. So the only thing you can do is check things with current mesa git / LLVM 6.0 and see if the problem persists.