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Re: Unhandled kernel unaligned access on IP32 w/ network I/O && 3.7.1?

To: Joshua Kinard <kumba@gentoo.org>
Subject: Re: Unhandled kernel unaligned access on IP32 w/ network I/O && 3.7.1?
From: Ralf Baechle <ralf@linux-mips.org>
Date: Fri, 28 Dec 2012 22:52:25 +0100
Cc: Linux MIPS List <linux-mips@linux-mips.org>
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On Thu, Dec 27, 2012 at 11:27:37PM -0500, Joshua Kinard wrote:

> Has anyone run into an unhandled kernel unaligned access under 3.7.1?  I've
> triggered it twice w/ network I/O on an SGI IP32 machine, however, the stack
> trace does not appear to be specific to any of IP32's own drivers.  3.6.7
> was very stable, and the two oopses I've triggered so far both happened
> under 3.7.1.
> 
> It looks like the culprit is in sk_stream_alloc_skb or tcp_sendmsg, however,
> I have little experience in the higher-level networking stack within Linux
> and wanted to see if anyone else has triggered this on other MIPS systems.
> 
> Seems to happen when I am logged in via SSH (on IPv6) and generating a burst
> of console output.
> 
> Unhandled kernel unaligned access[#3]:
> Cpu 0
> $ 0   : 0000000000000000 0000000000000010 0000000000000000 bfffff005671271c
> $ 4   : 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> $ 8   : 980000005c24e000 0000000000000000 980000005c24e000 00000000000000cc
> $12   : ffffffff9001fce1 000000001000001e fffffffffffff000 000000000000001f
> $16   : 980000005c00fa40 ffffffffde0300b8 ffffff0000000000 0000000000000005
> $20   : 000000007f875700 00000000000005a8 0000000000000008 0000000000000005
> $24   : 0000000000000001 00000000000003f0
> $28   : 980000005c00c000 980000005c00fa10 0000000000000000 ffffffff800059a0
> Hi    : 0000000007a11c93
> Lo    : b645a1cac992645e
> epc   : ffffffff8000b700 do_ade+0x1b0/0x480
>     Tainted: G      D
                     ^^^

This kernel has already oopsed before.  Which means this oops message is
pretty much worthless.

  Ralf

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