2.6.10 kernel panic: IDE/SCSI related?

[jago25_98]

I'm getting regular kernel panics with a vanilla 2.6.10 kernel.

Not sure how to tell which bit is causing the panic from the output
(which isn't logged).

Some of the output noted down by pen+paper:

Process Swapper (pid:0 threading info=c04b8000 task=c042db00)
Stack: ....
Call trace:
[] runtimer.softirq+0x11f/0x170
unknown boot option +0x0/0x...
code: f3....
kernel panic - not syncing: fatal exception in interupt

It crashes about every 2 days, usually when writing to disk but I'm
guessing here.

I have a system with 3 SCSI cards:
Adaptec AHA-2940/2940W
Adaptec AIC-7892A U160/m
American Megatrends Inc. MegaRAID 428 Ultra RAID Controller

An the IDE bus is:
[SiS] 5513

and maybe it could be related to this mix of hardware?

How do I begin to try and diagnose this problem? Really want to help
to fix this if I can.
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