linux-kernel - Re: Kernel OOPS and panic on boot in advantech watchdog init

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Message-ID: <20080919113356.111ce79f@lxorguk.ukuu.org.uk>
Date:	Fri, 19 Sep 2008 11:33:56 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"Bryan Donlan" <bdonlan@...il.com>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: Kernel OOPS and panic on boot in advantech watchdog init

On Thu, 18 Sep 2008 22:02:16 -0400
"Bryan Donlan" <bdonlan@...il.com> wrote:

> When testing a non-modular kernel on i386 with many of the default
> drivers left on under Xen, I got the following oops and panic on boot:

Looks like yet another Xen bug

> [   30.328280] BUG: unable to handle kernel paging request at d6023220
> [   30.332244] IP: [<c021f6f3>] xen_set_pte+0x3/0x10

sc520 tries to make an ioremap to read 0xfffefcb0

> [   30.332244]  [<c037be42>] ioremap_page_range+0x1e2/0x280
> [   30.332244]  [<c023d311>] __ioremap_caller+0x1e1/0x340

The Xen glue should have either permitted the mapping or failed the
ioremap attempt with NULL.

Alan
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