linux-kernel - Re: early exception error

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Message-ID: <20081231093803.GA20882@localhost>
Date:	Wed, 31 Dec 2008 12:38:03 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	david@...g.hm
Cc:	Andi Kleen <andi@...stfloor.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: early exception error

[david@...g.hm - Tue, Dec 30, 2008 at 05:39:29PM -0800]
> On Wed, 31 Dec 2008, Andi Kleen wrote:
>
>> david@...g.hm writes:
>>>
>>> doing a grep through System.map for the address that appears in the
>>> error returns nothing
>>
>> This might be obvious, but you can't grep directly for these addresses
>> because System.map contains the starting addresses of functions only
>> and normally the reported address is somewhere in the middle of a
>> function. So you instead have to look for the highest number lower or equal
>> the address from the exception.
>
> thanks, this was not obvious to me
>
> the -2 error maps to
>
> ffffffff8099e4c1 T free_bootmem_node
> ffffffff8099e4e5 t alloc_bootmem_core
> ffffffff8099e774 t ___alloc_bootmem_nopanic
>
>
> the first error maps to
>
> ffffffff809c2de4 T free_bootmem_node
> ffffffff809c2e08 t alloc_bootmem_core
> ffffffff809c3097 t ___alloc_bootmem_nopanic
>
>
> so it looks like this is in alloc_bootmem_core in both cases.
>
> David Lang
>

Along with Andi's proposed earlyprintk=vga I think
bootmem_debug option could be usefull here too.

		- Cyrill -
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