[Bug 100725] [i915] oops in intel_update_cursor_plane(): "BUG: unable to handle kernel NULL pointer dereference"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100725

--- Comment #3 from David H. Gutteridge <dhgutteridge at hotmail.com> ---
(In reply to krisman from comment #2)
> (In reply to David H. Gutteridge from comment #0)
> > Created attachment 130919 [details]
> > Log of dmesg with drm.debug enabled from boot to oops
> > 
> > I've been encountering a recurring kernel oops since I upgraded a (rather
> > old) laptop to the 4.10 kernel series. These happen pretty consistently
> > after the machine has been up for a few hours, and after a series of
> > warnings are logged.
> > I reproduced this with Fedora's 4.10.11-200.fc25.i686 kernel last evening.
> > This is a regression against the 4.9 kernel.
> 
> > I've attached a dmesg log from boot to the oops, with drm.debug output
> > enabled.
> 
> Sorry for the delay.  Is this still reproducible with a recent kernel?
> 
> The log has some high order allocation failure in GEM immediately preceding
> the WARN_ON and oops, so this is likely a mishandling of the allocation
> error path.  Since you observed this on a 4.10 distro kernel, can you please
> confirm it still occur with the tip of drm-intel-nightly mainline branch and
> provide the logs?

I haven't reproduced it with a 4.11 series kernel, but I haven't been using the
machine as much of late, so I haven't really taxed it to the point it would
reliably hit this. I've cloned drm-intel-nightly and will build a test kernel
when I get a chance, probably next week.

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