[Bug 91790] TONGA hang in amdgpu_ring_lock

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91790

--- Comment #5 from Mathias Tillman <master.homer at gmail.com> ---
(In reply to Christian König from comment #3)
> That could just be a symptom of a hardware hang which isn't detected for
> some reason.
> 
> Please take a look at amdgpu_fence_info as well to see if there are any
> outstanding submissions.

If it's a hardware hang, wouldn't it also happen when using catalyst? It
doesn't happen there, so it should at least be possible to work around (if it
is a hardware problem).
I will continue investigating why this happens, but it does seem to me like
this, #91278, and #91676 all are caused by the same thing, but with different
log output depending on if you use drm-next-4.3 or drm-next-4.2.

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