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

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Date:	Wed, 16 Apr 2008 00:07:21 +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, travis@....com,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [bug] SLUB + mm/slab.c boot crash in -rc9


* Ingo Molnar <mingo@...e.hu> wrote:

> +++ linux/arch/x86/kernel/vmlinux_32.lds.S
> @@ -186,6 +186,7 @@ SECTIONS
>  	__per_cpu_start = .;
>  	*(.data.percpu)
>  	*(.data.percpu.shared_aligned)
> +	. = . + 65536;
>  	__per_cpu_end = .;
>    }
>    . = ALIGN(PAGE_SIZE);

this seems to have the intended effect of +0x10000 padding at the end of 
the percpu area:

 c0b927d0 D per_cpu__cpu_info
 c0b92880 d per_cpu__runqueues
 c0ba2d00 D __per_cpu_end
 c0ba3000 B __bss_start

it still crashes though, with an very similar crash pattern to the 
previous ones.

	Ingo

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