linux-kernel - Re: [bug] SLUB + mm/slab.c boot crash in -rc9

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Message-ID: <48051B22.1040901@sgi.com>
Date:	Tue, 15 Apr 2008 14:16:18 -0700
From:	Mike Travis <travis@....com>
To:	Christoph Lameter <clameter@....com>
CC:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org, Mel Gorman <mel@....ul.ie>,
	Nick Piggin <npiggin@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Yinghai.Lu@....com,
	apw@...dowen.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [bug] SLUB + mm/slab.c boot crash in -rc9

Christoph Lameter wrote:
> On Tue, 15 Apr 2008, Ingo Molnar wrote:
> 
>> and the bug pattern seems to be memory corruption - not memory 
>> exhaustion.
> 
> SLUB does not do a memory allocation where it fails here but simply 
> accesses per cpu information that is expected to be already zeroed.
> 
>> i.e. we allocated RAM but it got corrupted after allocation.
> 
> In some situations we are screwing up the per cpu data handling on 
> 32 bit x86? Adding Mike. This looks like the per cpu area overlaps with 
> something else?
> 
> 

I'll certainly take a look...

-Mike
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