linux-kernel - Re: [PATCH] kdump: Fix invalid access on i386 sparsemem.

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Date:	Mon, 20 Oct 2008 09:14:33 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Ken'ichi Ohmichi <oomichi@....nes.nec.co.jp>
Cc:	kexec-ml <kexec@...ts.infradead.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Huang Ying <ying.huang@...el.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] kdump: Fix invalid access on i386 sparsemem.


* Ken'ichi Ohmichi <oomichi@....nes.nec.co.jp> wrote:

> 
> Hi,
> 
> Since linux-2.6.27, kdump has failed on i386 sparsemem kernel.
> 1st-kernel gets a panic just before switching to 2nd-kernel.
> 
> The cause is that a kernel accesses invalid mem_section by
> page_to_pfn(image->swap_page) at machine_kexec().
> image->swap_page is allocated if kexec for hibernation, but
> it is not allocated if kdump. So if kdump, a kernel should
> not access the mem_section corresponding to image->swap_page.
> The attached patch fixes this invalid access.

applied to tip/x86/urgent, thanks!

	Ingo
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