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Date: Wed, 16 Apr 2008 00:07:21 +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,
       travis@sgi.com, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Subject: Re: [bug] SLUB + mm/slab.c boot crash in -rc9
Message-ID: <20080415220721.GA11579@elte.hu>
References: <20080415203405.GA27958@elte.hu> <20080415204208.GA30432@elte.hu> <Pine.LNX.4.64.0804151344340.1785@schroedinger.engr.sgi.com> <20080415205820.GC31645@elte.hu> <Pine.LNX.4.64.0804151405120.3252@schroedinger.engr.sgi.com> <20080415211953.GA4243@elte.hu> <Pine.LNX.4.64.0804151420430.3252@schroedinger.engr.sgi.com> <20080415212301.GA5428@elte.hu> <Pine.LNX.4.64.0804151423460.3252@schroedinger.engr.sgi.com> <20080415212833.GA6180@elte.hu>
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* Ingo Molnar <mingo@elte.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