https://bugs.freedesktop.org/show_bug.cgi?id=64776
--- Comment #4 from Alex Deucher agd5f@yahoo.com --- (In reply to comment #3)
I have no idea where to start. I know how to compile code and debug program, but i have no clue on the mesa's code structure, and how it works. I don't know what CB6 is, i'm not sure about page meaning (is it similar to "classic" RAM page?) etc.. can you tell me at least witch bunch of file/operation i have to debug, and how?
CB6 is the 6th color buffer and the GPU has a VM page table just like the CPU. That info is not really important for you, I mentioned it for other developers. If you could bisect mesa using git, that would be great. There are a lot of howtos for using git to bisect. E.g., https://wiki.ubuntu.com/X/BisectingMesa
In your case, it would be something like: git bisect start git bisect bad mesa-9.1.2 git bisect good mesa-9.1.1