linux-kernel - Re: i915_hangcheck_hung problem with 3.8-rc2+ (Linus's latest tree)

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Date:	Thu, 10 Jan 2013 11:19:24 +1000
From:	Dave Airlie <airlied@...il.com>
To:	Chris Wilson <chris@...is-wilson.co.uk>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	Dave Kleikamp <dave.kleikamp@...cle.com>,
	Lijo Antony <lijo.kernel@...il.com>, daniel.vetter@...ll.ch,
	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: i915_hangcheck_hung problem with 3.8-rc2+ (Linus's latest tree)

On Thu, Jan 10, 2013 at 11:07 AM, Chris Wilson <chris@...is-wilson.co.uk> wrote:
> On Wed, 9 Jan 2013 16:40:25 -0800, Greg KH <gregkh@...uxfoundation.org> wrote:
>> On Wed, Jan 09, 2013 at 02:12:04PM -0600, Dave Kleikamp wrote:
>> > On 01/09/2013 01:44 PM, Dave Kleikamp wrote:
>> > >
>> > > I can easily reproduce it running glxgears on 3.8-rc1 or 3.8-rc2.
>> > >
>> > > 00:02.0 VGA compatible controller [0300]: Intel Corporation Core
>> > > Processor Integrated Graphics Controller [8086:0046] (rev 02)
>> > >
>> > > Thinkpad T410
>> > >
>> > > Shaggy
>> >
>> > Daniel's patch:
>> >
>> > drm/i915: Revert shrinker changes from "Track unbound pages"
>> >
>> > fixes the problem for me.
>>
>> After an afternoon of multiple kernel builds and other stressful things,
>> it looks like it fixes it for me as well.  Chris, this will be going to
>> Linus soon, right?
>
> Daniel will send it on. I hope before he does so, he will clarify the
> changelog to note that it is just papering over the issue. If the
> conjecture is right, it will not prevent that path from triggering the
> hang, nor does it prevent other eviction paths from potentially causing
> the same issue.

In this case since the issue was papered over all the kernel up until
3.7, I think repapering is the answer for now. I have a novel idea
maybe someone could spend some time working out what is broken in
private on a test box instead of making everyone who runs 3.7 and 3.8
on ILK deal with it. I of course know this won't happen and I'll be
reverting patches from you guys that cause Ironlake flakyness for
ever.

Dave.
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