[Bug 106859] [snb] Graphic corruptions and GPU hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106859

--- Comment #11 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Lionel Landwerlin from comment #10)
> It seems the kernel flags "Web Content" (which I'm guessing is Firefox) as
> the culprit of the GPU hang.

You have to be wary in this case. This is Sandybridge and it doesn't have
segregated per-process memory, so any client can overwrite the memory of
another. In this case, the corruption happened to be in a batch submitted by
firefox, but that doesn't guarantee that it was firefox doing the stray writes.
But it's a good start since to overwrite a batch buffer, the batch buffer must
have been submitted to the GPU and waiting on execution; and the execution
pipelines are typically short so the number of clients who may have overwritten
the batch is small, and the submitter the prime suspect.

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