[Bug 57122] [g4x regression] Graphics crash on Intel G41 under 3.7-rc3

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=57122

--- Comment #60 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to comment #58)
> Created attachment 71682 [details]
> Screenshot showing artifact
> 
> This is the artifact I am seen most frequently with SNA (all the time, all
> the windows). The middle button of the window decoration (gnome-shell) is
> supposed to show the maximize icon, but instead is blank. This does not
> occur with the 3.6.x kernel, or with the default (crashing) UXA acceleration.

I could have sworn that was the CompositeTrapezoids Damage bug (lack of Damage
notification sent). But that should also be the case with 3.6. It looks like it
should be a small inline trapezoid, in which case it will be upload through an
async buffer (either snooped or GTT depending upon state and kernel.) Daniel,
can you remember when set_cacheing finally landed? That might indeed be 3.7.


(In reply to comment #59)
> Is there any monitoring I could perform in the background under 3.7 that
> will provide information on the root cause of the crash, *before* said crash
> happens?

Well, you've debunked my best ideas so far. I'm convinced that the key
difference is in the relocation-*tree* used by UXA. But not yet sure how the
bug is manifesting itself. In that scenario the most likely culprit is that we
reuse stale relocation entries believing that they are valid. Perhaps if we
always forced the relocations?

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