[Bug 247166] graphics/drm-devel-kmod: panic with i915kms on -current

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247166

Vladimir Kondratyev <wulf at freebsd.org> changed:

           What    |Removed                     |Added
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                 CC|                            |wulf at freebsd.org

--- Comment #5 from Vladimir Kondratyev <wulf at freebsd.org> ---
The panic is easy reproducible on KabyLake. All you need is to run guc firmware
or vp8enc from multimedia/libva-utils. Both of them trigger it instantly.

I workarounded it with updating linux_reservation.c to up to date version
(really to 5.3) and moving critical section start in
reservation_object_add_shared_fence() routine down to RCU_INIT_POINTER macro.

There were lot of dma_fence changes in 5.0-5.4 timeframe, so it may have sense
to start fixing the bug after drm-kmod reaches v5.4

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