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Message-ID: <48051B22.1040901@sgi.com>
Date: Tue, 15 Apr 2008 14:16:18 -0700
From: Mike Travis <travis@sgi.com>
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To: Christoph Lameter <clameter@sgi.com>
CC: Ingo Molnar <mingo@elte.hu>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Pekka Enberg <penberg@cs.helsinki.fi>, linux-kernel@vger.kernel.org,
       Mel Gorman <mel@csn.ul.ie>, Nick Piggin <npiggin@suse.de>,
       Andrew Morton <akpm@linux-foundation.org>,
       "Rafael J. Wysocki" <rjw@sisk.pl>, Yinghai.Lu@sun.com, apw@shadowen.org,
       KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Subject: Re: [bug] SLUB + mm/slab.c boot crash in -rc9
References: <20080415161532.GA15088@elte.hu> <alpine.LFD.1.00.0804151010500.2879@woody.linux-foundation.org> <Pine.LNX.4.64.0804151232080.1785@schroedinger.engr.sgi.com> <20080415195430.GA23015@elte.hu> <Pine.LNX.4.64.0804151255390.1785@schroedinger.engr.sgi.com> <20080415201734.GA25628@elte.hu> <20080415202805.GA26880@elte.hu> <20080415203405.GA27958@elte.hu> <20080415204208.GA30432@elte.hu> <Pine.LNX.4.64.0804151344340.1785@schroedinger.engr.sgi.com> <20080415205820.GC31645@elte.hu> <Pine.LNX.4.64.0804151405120.3252@schroedinger.engr.sgi.com>
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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