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

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Message-ID: <CAF6AEGsdK4MUm9G8ruX84V5omhej+in7vP5E8skMAoTjRgh7nw@mail.gmail.com>
Date:	Mon, 25 Nov 2013 08:23:31 -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

oh, hmm.. are you importing buffers from i915?  It looks like this part:

- if (obj->base.import_attach) {
- drm_free_large(obj->pages);
- obj->pages = NULL;
- return;
- }

should not have been removed from udl_gem_put_pages()..

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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