linux-kernel - Re: [i915] BUG: Bad page state in process Xorg

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Date:	Sat, 30 Nov 2013 08:55:16 -0500
From:	Rob Clark <robdclark@...il.com>
To:	Thomas Meyer <thomas@...3r.de>
Cc:	Daniel Vetter <daniel@...ll.ch>,
	DRI mailing list <dri-devel@...ts.freedesktop.org>,
	Dave Airlie <airlied@...ux.ie>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [i915] BUG: Bad page state in process Xorg

On Sat, Nov 30, 2013 at 3:33 AM, Thomas Meyer <thomas@...3r.de> wrote:
> Am Montag, den 25.11.2013, 08:23 -0500 schrieb Rob Clark:
>> oh, hmm.. are you importing buffers from i915?  It looks like this part:
>
> My computer has an i915 graphic card and I use an USB docking station,
> that has an unconnected UDL device inside.
>
>>
>> - if (obj->base.import_attach) {
>> - drm_free_large(obj->pages);
>> - obj->pages = NULL;
>> - return;
>> - }
>>
>> should not have been removed from udl_gem_put_pages()..
>
> Do you want me to test this? Can this please be fixed in the stable
> tree?
> I removed the UDL driver from my config for now, as I don't use it.

It would be nice if you could test that (I can send you a patch if you
prefer)..  I don't actually have any UDL device to confirm.  If this
fixes the problem, send the patch to stable as well should not be a
problem.

BR,
-R


>       *
> best regards
> thomas
>
>>
>> BR,
>> -R
>>
>> On Mon, Nov 25, 2013 at 8:17 AM,  <thomas@...3r.de> wrote:
>> > Hi,
>> >
>> > It turns out that this seems to be a bug in udl DRM driver.
>> >
>> > I bisected the problem to this patch:
>> >
>> > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/gpu/drm/udl?id=5dc9e1e87229cb786a5bb58ddd0d60fee6eb4641
>> >
>> > With kind regards
>> > Thomas
>> >
>> > Am 22.11.2013 17:18 schrieb Daniel Vetter <daniel@...ll.ch>:
>> >>
>> >> On Fri, Nov 22, 2013 at 4:54 PM, Thomas Meyer <thomas@...3r.de> wrote:
>> >> >> Am 22.11.2013 um 11:55 schrieb Daniel Vetter <daniel@...ll.ch>:
>> >> >>
>> >> >> On Fri, Nov 22, 2013 at 11:36 AM, Dave Airlie <airlied@...ux.ie> wrote:
>> >> >>>> Hi,
>> >> >>>
>> >> >>> cc'ing mailing list,
>> >> >>>
>> >> >>> Daniel any ideas?
>> >> >>
>> >> >> Nope, not really :( And no ideas how to triage this further - if it
>> >> >> takes 9 days to hit it eventually we'll have a real hard time. Or does
>> >> >> this happen even after just a short X run?
>> >> >
>> >> > Seems to happen every time while stopping the x server. Also after a short run time.
>> >> >
>> >> > The current fedora 3.11 kernel doesn't show this bug. I'm using fedora 19, with a self compiled kernel.
>> >> >
>> >> > I did turn on config-debug-pagealloc but this didn't show any wrongness.
>> >>
>> >> In that case I think the bisect is the fastest way to insight - atm
>> >> I'm really at loss what could be wrong here.
>> >> -Daniel
>> >> --
>> >> Daniel Vetter
>> >> Software Engineer, Intel Corporation
>> >> +41 (0) 79 365 57 48 - http://blog.ffwll.ch
>
>
>
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