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From: John Baldwin <jhb@FreeBSD.org>
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Date: Mon, 15 Nov 2004 11:11:11 -0500
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cc: Robert Watson <rwatson@FreeBSD.org>
Subject: Re: alpha and em mtu
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On Sunday 14 November 2004 04:26 pm, Sten Spans wrote:
> I upgraded my ds10 with an intel gigabit card,
> and encountered the following issue (RELENG_5):
>
> deepthought# ifconfig em0 mtu 1501
> deepthought#
> fatal kernel trap:
>
>      trap entry     = 0x4 (unaligned access fault)
>      faulting va    = 0xfffffc001847a02e
>      opcode         = 0x28
>      register       = 0x1
>      pc             = 0xfffffc00004cd0f8
>      ra             = 0xfffffc00004cce24
>      sp             = 0xfffffe00187a9af0
>      curthread      = 0xfffffc001f3a70e0
>          pid = 14, comm = swi1: net
>
> [thread 100006]
> Stopped at      tcp_input+0x368:        srl     t0,#0x2,t0      <t0=0x45>
> db> trace
> tcp_input() at tcp_input+0x368

Can you do 'gdb kernel.debug' in your kernel build directory and then do 'l 
*tcp_input+0x368' to determine which source line it is panic'ing at?  This 
might help us figure out what the unaligned access is so it can be fixed.  If 
you don't have a debug kernel, please build one and reproduce the panic to 
get the updated 'tcp_input+0xblah' line and then do the gdb command with the 
updated 'tcp_input+0xblah' bit.  Thanks.

-- 
John Baldwin <jhb@FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org