[Bug 91790] TONGA hang in amdgpu_ring_lock

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

--- Comment #1 from Andy Furniss adf.lists@gmail.com --- Created attachment 117963 --> https://bugs.freedesktop.org/attachment.cgi?id=117963&action=edit mplayer X hung task

I got a similar trace yesterday on current agd5f drm-next-4.3 while trying to kill uvd with mplayer by repeatedly starting.

I am slightly hopeful this is a different issue from uvd as it starts with X and I got way more starts than I recently have - 360 to get this trace after a couple of OK 250 runs.

I haven't locked in normal use, but then my desktop setup is simple = fluxbox.