linux-kernel - Re: WARNING: at mm/slub.c:3357, kernel BUG at mm/slub.c:3413

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Message-ID: <CAH3drwbZRUV75acco9uWigHLt1brANP1uQ=sAomASdfFv=_AbA@mail.gmail.com>
Date:	Mon, 5 Dec 2011 13:43:32 -0500
From:	Jerome Glisse <j.glisse@...il.com>
To:	Markus Trippelsdorf <markus@...ppelsdorf.de>
Cc:	Dave Airlie <airlied@...il.com>, Christoph Lameter <cl@...ux.com>,
	"Alex, Shi" <alex.shi@...el.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	dri-devel@...ts.freedesktop.org, Pekka Enberg <penberg@...nel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Matt Mackall <mpm@...enic.com>, tj@...nel.org,
	Alex Deucher <alexander.deucher@....com>
Subject: Re: WARNING: at mm/slub.c:3357, kernel BUG at mm/slub.c:3413

On Mon, Dec 5, 2011 at 1:15 PM, Markus Trippelsdorf
<markus@...ppelsdorf.de> wrote:
> On 2011.12.05 at 12:10 -0500, Jerome Glisse wrote:
>> On Sun, Dec 04, 2011 at 02:02:00AM +0100, Markus Trippelsdorf wrote:
>> > On 2011.12.03 at 14:31 -0500, Jerome Glisse wrote:
>> > > On Sat, Dec 3, 2011 at 7:29 AM, Markus Trippelsdorf
>> > > <markus@...ppelsdorf.de> wrote:
>> > > > On 2011.12.03 at 12:20 +0000, Dave Airlie wrote:
>> > > >> >> > > > > FIX idr_layer_cache: Marking all objects used
>> > > >> >> > > >
>> > > >> >> > > > Yesterday I couldn't reproduce the issue at all. But today I've hit
>> > > >> >> > > > exactly the same spot again. (CCing the drm list)
>> > > >>
>> > > >> If I had to guess it looks like 0 is getting written back to some
>> > > >> random page by the GPU maybe, it could be that the GPU is in some half
>> > > >> setup state at boot or on a reboot does it happen from a cold boot or
>> > > >> just warm boot or kexec?
>> > > >
>> > > > Only happened with kexec thus far. Cold boot seems to be fine.
>> > > >
>> > >
>> > > Can you add radeon.no_wb=1 to your kexec kernel paramater an see if
>> > > you can reproduce.
>> >
>> > No, I cannot reproduce the issue with radeon.no_wb=1. (I write this
>> > after 700 successful kexec iterations...)
>> >
>>
>> Can you try if attached patch fix the issue when you don't pass the
>> radeon.no_wb=1 option ?
>
> Yes the patch finally fixes the issue for me (tested with 120 kexec
> iterations).
> Thanks Jerome!
>
> --
> Markus

Will respin with some minor code changes.

Cheers,
Jerome
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