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

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Date:	Mon, 21 Nov 2011 23:30:59 +0200
From:	Pekka Enberg <penberg@...nel.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	Eric Dumazet <eric.dumazet@...il.com>,
	"Alex,Shi" <alex.shi@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Matt Mackall <mpm@...enic.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Tejun Heo <tj@...nel.org>,
	Christian Kujau <lists@...dbynature.de>
Subject: Re: WARNING: at mm/slub.c:3357, kernel BUG at mm/slub.c:3413

On Mon, 2011-11-21 at 20:51 +0100, Markus Trippelsdorf wrote:
>> On 2011.11.21 at 19:52 +0100, Markus Trippelsdorf wrote:
>> > On 2011.11.21 at 19:39 +0100, Eric Dumazet wrote:
>> > > Le lundi 21 novembre 2011 à 18:35 +0100, Markus Trippelsdorf a écrit :
>> > >
>> > > > New one:
>> > >
>> > > ...
>> > >
>> > > I was just wondering if you were using CONFIG_CGROUPS=y, and if yes, if
>> > > you could try to disable it.
>> >
>> > # CONFIG_CGROUPS is not set
>> >
>> > (I never enable CGROUPS on my machines)
>>
>> Just for the record, I've attached full dmesg and my .config.
>> (Will continue testing tomorrow)

On Mon, Nov 21, 2011 at 10:27 PM, Benjamin Herrenschmidt
<benh@...nel.crashing.org> wrote:
> Note that I hit a similar looking crash (sorry, I couldn't capture a
> backtrace back then) on a PowerMac G5 (ppc64) while doing a large rsync
> transfer yesterday with -rc2-something (cfcfc9ec) and
> Christian Kujau (CC) seems to be able to reproduce something similar on
> some other ppc platform (Christian, what is your setup ?)
>
> We haven't hit the poison checks, more like bad pointer derefs, almost
> always in SLUB coming from skb alloc or free.
>
> In my case, it's not easy to reproduce, so a bisection would be
> error-prone.

Does CONFIG_SLAB make all the issues go away or are you still able to
reproduce corruption with it? I'm asking because we have the per-cpu
partial list patches in 3.2-rc1 and I'd like to rule them out as a
suspect.

                        Pekka
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