linux-kernel - Re: BUG: unable to handle kernel paging request at virtual address

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Message-ID: <20080105212050.GA2434@martell.zuzino.mipt.ru>
Date:	Sun, 6 Jan 2008 00:20:50 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Alexander Shaduri <ashaduri@...il.com>
Cc:	Al Viro <viro@...IV.linux.org.uk>,
	Mikael Pettersson <mikpe@...uu.se>,
	linux-kernel@...r.kernel.org
Subject: Re: BUG: unable to handle kernel paging request at virtual address

On Sun, Jan 06, 2008 at 12:30:34AM +0400, Alexander Shaduri wrote:
> > Get a serial console?  Take another box, plug e.g. pl2303-based
> > usb-to-serial (several bucks these days) into it, stick null-modem
> > convertor (ditto) on its serial end and attach to ttyS0 on the
> > victim.  console=ttyS0 on victim, something like minicom on watcher
> > and tell it to capture log into file...
> 
> I will try that (as soon as I acquire the necessary parts).

netconsole should be more quick:
* one more box with ethernet card
* CONFIG_NETCONSOLE=y
* CONFIG_ {your NIC driver} =y
* on crashing box add the following line to the kernel boot options

	netconsole=@...-ip/eth0,9353@...-ip/dst-MAC

where	scr-ip -- IP of crashing box
	eth0 -- interface on crashing box
	9353 -- destination port (for netcat to listen on target box)
	dst-ip -- IP of a box which collect logs
	dst-MAC -- MAC of the interface on destination box

* on destination box run netcat

	nc -u -l -p 9353 &>1.log

[* add ignore_loglevel on crashing box if paranoid]

Now reboot crashing box and reproduce the bug, chances are high that it
will send oops over network.
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