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Date: Sat, 13 Dec 2003 03:48:59 +0100
From: Ralf Baechle <ralf@linux-mips.org>
To: durai <durai@isofttech.com>
Cc: mips <linux-mips@linux-mips.org>
Subject: Re: Network problem in mips
Message-ID: <20031213024859.GA22208@linux-mips.org>
References: <008f01c3bff7$252e3b40$0a05a8c0@DURAI> <3FD88C4D.6010700@realitydiluted.com> <001d01c3c083$be226600$0a05a8c0@DURAI>
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On Fri, Dec 12, 2003 at 01:14:14PM +0530, durai wrote:

> Kernel unaligned instruction access in unaligned.c:do_ade, line 428:
> $0 : 00000000 a0000000 00097fff ffffffff 80fa228c ba000000 a0f40000 00000000
> $8 : 00000045 00000001 00ff0000 00ff0000 80fa228c 80f90738 00003b00 80fdd812
> $16: 80fa2000 80fe8221 80fe6010 00008da9 ff000000 00ff0000 80fa2000 a0f40000
> $24: 00000001 80494970                   8043a000 8043a118 80fa228c 80f930c1
                                           ^^^^^^^^^^^^^^^^^

$28 is the current pointer, $29 the stack pointer.

> epc  : 80f930c1
> Status: 3000fc00
> Cause : 00000010
> Process   (pid: -2142680720, stackpage=8043a000)

You've overflowed the stack to the point where the process structure got
overwritten. which also explains the nonsense pid value.  -2142680720 is
0x80494970 which is probably some valid kernel address.

Find what's consuming so much stack - you should only use a split fraction
of that.  The epc value also looks quite strange because it's lowest bit is
set - does your CPU support MIPS16?

  Ralf