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Date: Tue, 15 Apr 2008 22:58:57 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Christoph Lameter <clameter@sgi.com>
Cc: 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
Message-ID: <20080415205857.GD31645@elte.hu>
References: <84144f020804110211w4ae41414od24cf2de72453e13@mail.gmail.com> <20080415062534.GA9172@elte.hu> <alpine.LFD.1.00.0804150838161.2879@woody.linux-foundation.org> <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> <Pine.LNX.4.64.0804151319410.1785@schroedinger.engr.sgi.com>
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* Christoph Lameter <clameter@sgi.com> wrote:

> On Tue, 15 Apr 2008, Ingo Molnar wrote:
> 
> > my current guess would have been some bootmem regression/interaction 
> > that messes up the buddy bitmaps - but i just reverted to the v2.6.24 
> > version of bootmem.c and that crashes too ...
> 
> The simplest solution for now may be to go with your workaround increasing 
> SECTION_SIZE_BITS to 27. [...]

the bug's effects are so severe that this is the last thing i'd like to 
do.

	Ingo