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From: Michael Plass <mfp49_freebsd@plass-family.net>
Date: Wed, 5 Sep 2007 11:22:19 -0700
To: freebsd-current@freebsd.org
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Subject: Re: Unkillable and runaway processes
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On Wed, 05 Sep 2007, Benjamin Close wrote:

> I'd love to debug here this but can't as the box uses a USB
> mouse/keyboard so every time I drop to a debugger I lose keyboard  
> support :(

I have had some success using DDB with a USB keyboard by removing atk  
and kbdmux from the kernel config (nodevice lines for atkbdc, atkbd,  
psm, and kbdmux).

A downside is that when I do this, dumps stop working - they hang on  
the call to cncheckc() when checking for user abort (the cncheckc()  
never returns).  Replacing this call with (-1) allows the dump to  
proceed.  For me, the relevant file is /usr/src/sys/amd64/amd64/ 
minidump_machdep.c.

- Michael