[Bug 91133] [gm45] Invalid GTT entry during Command Fetch from CS prefetch crossing page boundary

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91133

--- Comment #4 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Vincent Legoll from comment #3)
> I'm not reproducing this any more with a new kernel: 4.1.0-11202-g4a10a91
> but I slightly tweaked the config, but not in GFX options though...

How reproducible was it before? My hypothesis is that the CS prefetched a page
as its PTE was being rewritten (since it crossed the boundary into an idle
object) and that somehow corrupted the page address. I just haven't figured out
how it can ever see an invalid GTT entry.

Anyway, my hypothesis says that it would be very hard to trigger reliably
(depends on timing and memory layout).

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