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

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Message-ID: <20080415232711.GA22679@elte.hu>
Date:	Wed, 16 Apr 2008 01:27:11 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Christoph Lameter <clameter@....com>
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


* Christoph Lameter <clameter@....com> wrote:

> Hmmm... If one enables CONFIG_X86_PAE (even with no highmem) then 
> everything is fine. For PAE to be enabled some other things also fall 
> by the wayside. Diff to your failing config follows. Will try to 
> minimize the diff even further:

... in the thread i've already explained that it's because on PAE we use 
1GB sparse chunks (shift 30) which masks the bug.

(on PAE we cannot go below a shift of 29 due to shortage of page->flags)

	Ingo
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