[Bug 91790] TONGA hang in amdgpu_ring_lock

[bugzilla-daemon@freedesktop.org]

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

--- Comment #15 from Andy Furniss <adf.lists@gmail.com> ---
(In reply to Andy Furniss from comment #13)
> (In reply to Mathias Tillman from comment #11)
> > (In reply to Alex Deucher from comment #10)
> > > Created attachment 118056 [details] [review] [review] [review]
> > > possible fix
> > > 
> > > I think this patch should fix it.
> > 
> > No luck here I'm afraid - I'm having a hard time reproducing it during
> > normal desktop usage (with or without the patch), but it did lockup while
> > running Unigine Valley.
> 
> I see drm-next-4.3 is now ahead again, haven't tested that yet.
> 
> With patch + drm-next-4.3-wip, I haven't yet managed to lock valley - but
> I've only had time to do a couple of runs (45 min then 90 min) from a clean
> boot. Maybe later when I've been up a while doing other things I'll try
> harder.
> 
> Patch doesn't apply with git apply - did it by hand.

I managed to lock it, seems that doing "something" between runs changes things,
or first runs are lucky.

FWIW I tried running Unreal 4.5 ElementalDemo after my long runs and I got a
signal 7.

After I later locked/hung valley I rebooted and tried again elemental from a
clean boot and it ran OK, but after quitting. it now gives signal 7 again if I
try to start it.

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