Created attachment 117963 [details]
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.