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Re: Unhandled kernel unaligned access debugging

To: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Subject: Re: Unhandled kernel unaligned access debugging
From: Florian Fainelli <florian.fainelli@telecomint.eu>
Date: Sat, 30 Jun 2007 18:53:59 +0200
Cc: michael@frogfoot.com, linux-mips@linux-mips.org
In-reply-to: <20070701.014454.126142904.anemo@mba.ocn.ne.jp>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <20070629163951.GG5929@marmite.frogfoot.net> <20070701.014454.126142904.anemo@mba.ocn.ne.jp>
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Hello Michael,

The OpenWrt kernel is based on the mainline kernel plus some other patches we 
maintain for memory footprint or features. 

I suggets you disable mini_fo in the kernel configuration because it was 
responsible for some memory corruption.

You could also have reported the bug to our bug tracking system at 
https://dev.openwrt.org. You will see that there a lot of other people trying 
to get AR7 work (better ?).

Best regards, Florian

Le samedi 30 juin 2007, Atsushi Nemoto a écrit :
> On Fri, 29 Jun 2007 18:39:51 +0200, Michael Wood <michael@frogfoot.com> 
wrote:
> > I think understand more or less what this means, but am unsure of how to
> > debug it.  I think OpenWRT is using the vanilla kernel, but maybe I'm
> > missing something.  Is this because I'm not using the kernel from
> > linux-mips.org?
>
> It is not vanilla kernel.  squashfs is not merged mainline yet.
>
> > Unhandled kernel unaligned access[#1]:
> > Cpu 0
> > $ 0   : 00000000 10008400 69725020 94001b90
> > $ 4   : 94003200 7265746e 00000002 00000000
> > $ 8   : 94016338 940162b0 94016228 940161a0
> > $12   : 94e5653c 943a0000 943a0000 94e5659c
> > $16   : 94001b80 00000000 94003200 00000002
> > $20   : 00000000 00000000 00000000 00000000
> > $24   : 00000000 9410b8a0
> > $28   : 943e4000 943e5ec0 00000000 94175e40
> > Hi    : 00000003
> > Lo    : 00000002
> > epc   : 941742bc drain_freelist+0x6c/0xf8     Not tainted
> > ra    : 94175e40 cache_reap+0xc0/0x124
> > Status: 10008402    KERNEL EXL
> > Cause : 10800010
> > BadVA : 7265746e
> > PrId  : 00018448
>
> ...
>
> > 0xffffffff941742bc <drain_freelist+108>:        lw      v1,0(a1)
>
> The value of a1 (0x7265746e) is not a kernel address and I do not
> think drain_freelist use such an address.  So it would not be an
> "unaligned access" problem.  I support it would be some sort of memory
> corruption.
>
> ---
> Atsushi Nemoto



-- 
Cordialement, Florian Fainelli
---------------------------------------------

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