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

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Message-ID: <Pine.LNX.4.64.0804151319410.1785@schroedinger.engr.sgi.com>
Date:	Tue, 15 Apr 2008 13:54:51 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Ingo Molnar <mingo@...e.hu>
cc:	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

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?
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