linux-kernel - Re: BUG: unable to handle kernel paging request at ffff8800cf669000

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Message-ID: <20110117070000.GE11358@cr0.nay.redhat.com>
Date:	Mon, 17 Jan 2011 15:00:00 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	xing lin <linxingnku@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: BUG: unable to handle kernel paging request at ffff8800cf669000

On Sat, Jan 15, 2011 at 04:03:59PM -0700, xing lin wrote:
>It turns out I can not read that page in a kernel module at all. A
>simple read of that page will result in an oops as well. I have
>checked the flags of this page with others. They are almost the same.
>Any suggestions about why this happens or how to know whether a page
>can be read or not are really welcome. Thanks.
>

If you are using x86, you have CONFIG_X86_PTDUMP, with which
you can dump all page tables via debugfs.

Hope this helps.
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