linux-kernel - Re: [BUG 2.6.30] Bad page map in process

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Date:	Sun, 12 Jul 2009 09:57:31 +0200
From:	Haavard Skinnemoen <haavard.skinnemoen@...el.com>
To:	Hugh Dickins <hugh.dickins@...cali.co.uk>
Cc:	Guennadi Liakhovetski <g.liakhovetski@....de>, linux-mm@...ck.org,
	kernel@...32linux.org, linux-kernel@...r.kernel.org
Subject: Re: [BUG 2.6.30] Bad page map in process

On Fri, 10 Jul 2009 19:34:06 +0100 (BST)
Hugh Dickins <hugh.dickins@...cali.co.uk> wrote:

> I've not looked up avr32 pte layout, is 13f26ed4 good or bad?
> I hope avr32 people can tell more about the likely cause.

It looks OK for a user mapping, assuming you have at least 64MB of
SDRAM (the SDRAM starts at 0x10000000) -- all the normal userspace flags
are set and all the kernel-only flags are unset. It's marked as
executable, so it could be that the segfault was caused by the CPU
executing the wrong code.

The virtual address 0x4377f876 is a bit higher than what you normally
see on avr32 systems, but there's not necessarily anything wrong with
it -- userspace goes up to 0x80000000.

Btw, is preempt enabled when you see this?

Haavard
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