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Date: Tue, 15 Apr 2008 13:54:51 -0700 (PDT)
From: Christoph Lameter <clameter@sgi.com>
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To: Ingo Molnar <mingo@elte.hu>
cc: Linus Torvalds <torvalds@linux-foundation.org>,
       Pekka Enberg <penberg@cs.helsinki.fi>, linux-kernel@vger.kernel.org,
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       KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Subject: Re: [bug] SLUB + mm/slab.c boot crash in -rc9
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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. PAE mode already uses 30 and x86_64 also works 
with 27. This is going to affect the memory hotplug granularity for !PAE 
32 bit configs though. Kame-san, any concerns with that?