linux-kernel - Re: 2.6.22-rc2-mm1 - a different BUG: at mm/slab.c:777 __find_general

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Date:	Mon, 28 May 2007 07:12:44 -0400
From:	Valdis.Kletnieks@...edu
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.22-rc2-mm1 - a different BUG: at mm/slab.c:777 __find_general_cachep()

On Mon, 28 May 2007 13:43:12 +0300, Pekka Enberg said:
> On 5/28/07, Valdis.Kletnieks@...edu <Valdis.Kletnieks@...edu> wrote:
> > [4294667.472000] BUG: at mm/slab.c:777 __find_general_cachep()
> 
> [snip]
> 
> > Any suggestions before I go doing the bisect shuffle?
> 
> It's complaining about a kmalloc() with size zero. The warning is new
> and harmless for now, so no need to bisect this (it will point you at
> the mm/slab.c change by Christoph Lameter).

I knew *that* part.  Closer look at drivers/firmware/dmi-id.c indicates that
it's likely a busticated DMI field in my BIOS - looking around at the stuff in
/sys/devices/virtual/dmi/id I found that the files product_version, board_version
board_asset_tag, chassis_version, and chassis_asset_tag are empty (trying
to 'cat' them gets just a \n) - the other values all look sane.

This looks fishy:

#define ADD_DMI_ATTR(_name, _field)         if (dmi_get_system_info(_field))                 sys_dmi_attributes[i++] = & sys_dmi_##_name##_attr.attr;

Should that be making a check that it's not pointing at a null string?

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