[Bug 99295] [Regression BDW] kernel panic in Intel i915 module, complete system freeze in 4.10-rc2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99295

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #8 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Chris Wilson from comment #7)
> From bug 99584:
> 
> It looks like we are hitting a use-after-free in
> gen8_ppgtt_alloc_page_directories with some pdp state. One possible theory
> from looking at the log is that the shrinker kicks in and starts swinging
> its axe, evicting one or more vma's, which results in said pdp being freed,

Confirmed with a kselftest that is exactly what is happening here. Or at least
we have a bug exactly like that. The patches to adjust used_pte accounting
fixes my kselftest.

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