[Intel-gfx] "BUG: unable to handle kernel NULL pointer dereference at 0000000000000070" in [i915] reset_common_ring

[Chris Wilson]

Quoting Bjørn Mork (2017-10-19 11:43:17)
> Chris Wilson <chris at chris-wilson.co.uk> writes:
> 
> > Quoting Bjørn Mork (2017-10-19 11:24:57)
> >> Hello,
> >> 
> >> I get these Oopses from time to time, but unfortunately(?) not often
> >> enough to be anywhere near reproducible.  But they seem to be related to
> >> whatever activites my laptop/X-server/driver/gpu/screen is doing while
> >> I'm not present. The oops happens when I'm away for a while.  So I guess
> >> it might be something related to screensaver and/or power saving
> >> actions.
> >> 
> >> There is always a GPU HANG prior to the Oops, so these events are
> >> probably related.  
> >
> > It is, but the oops implies that hw got lost along the way. You need a
> > more recent kernel to avoid that trap,
> 
> OK.  Would it be possible to backport those fixes to linux-4.9.y as a
> service to Debian users and other stable kernel users? Or did you mean a
> newer 4.9.y kernel?

Take 4.14 and patch the Makefile. ;) Hmm, now that I think about it the
preventative rewrite may not land until 4.15.
-Chris