linux-kernel - Re: [bug, netconsole, SLUB] BUG skbuff_head

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Message-ID: <84144f020807180216mfd5e803o8f3f1a94b2db1a74@mail.gmail.com>
Date:	Fri, 18 Jul 2008 12:16:26 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	"Vegard Nossum" <vegard.nossum@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, cl@...ux-foundation.org,
	davem@...emloft.net, johnpol@....mipt.ru
Subject: Re: [bug, netconsole, SLUB] BUG skbuff_head_cache: Poison overwritten

On Fri, Jul 18, 2008 at 12:11 PM, Ingo Molnar <mingo@...e.hu> wrote:
>
> * Pekka J Enberg <penberg@...helsinki.fi> wrote:
>
>> >   Object 0xf658ae70:  6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
>>
>> It's bit unfortunate that we don't see full dump of the corruption
>> here because SLUB limits the output to 128 bytes. Ingo, you might want
>> to try this patch so that we can see all of it:
>
> ok, applied this as a debug special to tip/out-of-tree - future
> incidents should have the full object dump.
>
> would makes sense for upstream too i think, or increase the limit to 4K
> or so. (which is still fair to be dumped into a syslog)

SLUB already limits object sizes to less than PAGE_SIZE so the patch
should be fine. Christoph, are you okay with this going upstream?
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