A 'zypper dup' earlier today upgraded my machine to Kernel 4.10.10 and reinstalled Mesa 17.0.3. I understand this means that llvm 4.0.0 should be in effect on both of these components, and if llvm was at fault the issue should now disappear. I've had more freezes during the last few days, and if somehow they continue even after this we'll seriously need to dig further. I will immediately let everyone know if I see another freeze from this point on.