Subject: Re: panic upon detaching and reattaching kue on amd64
To: Blair Sadewitz <email@example.com>
From: Chris Tribo <firstname.lastname@example.org>
Date: 09/27/2006 14:28:31
On Sep 26, 2006, at 10:43 PM, Blair Sadewitz wrote:
> I would submit a PR for this but I have been unable to capture the
> contents of the panic message; it has happened twice. If it
> happens again, I will try to have a pen and paper handy before the
> "crash dump megabyte countdown" consumes the screen. What's
> happening is just what the subject says; sometimes, as I noted
> previously, I must prod the USB subsystem/kue driver by hotplugging
> the adapter one or two times in order to get the firmware to load
> properly and/or the device probed.
> How does one capture the panic message aside from writing it down,
> anyway? I will look into this when I have time but a suggestion
> from someone more experienced than I would be helpful.
I don't know if it makes it into the message buffer in this case, try
dmesg -x? If it doesn't work, try:
compile the kernel with -g and boot it
sysctl -w ddb.onpanic=1
cause the panic
After reboot you can use gdb on the core or dmesg -x to extract the
panic messages from the core file.