[Bug 63921] [snb] GTT mapping fails after GPU hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=63921

--- Comment #35 from Nicolas Hillegeer <nicolashillegeer at gmail.com> ---
(In reply to comment #34)
> That patch shouldn't itself cause a lockup - so I wonder if the system would
> have eventually locked up anyway if X didn't die first. But that the patch
> eliminates the false SIGBUS and failed mmaps is a good sign! :)

Good question, my intuition also tells me that it would've locked up
eventually. But that's because I'm still under the assumption that it's a
resource exhaustion problem, which might be completely false, since I've never
dealt with video card code in my life. In this way X serves as a full-crash
shield, how nice ;).

The system locking up completely does make it very hard to diagnose anything at
all though. Any idea on something I could try?

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