From owner-freebsd-hackers  Mon Aug 13  8:54:32 2001
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To: volf@oasis.IAEhv.nl (Frank Volf)
Cc: freebsd-hackers@freebsd.org
Subject: Re: how to debug a kld module?
References: <20010813142301.3A6D23E02@drawbridge.oasis.IAEhv.nl>
From: Rolf Neugebauer <neugebar@dcs.gla.ac.uk>
Date: 13 Aug 2001 16:54:15 +0100
In-Reply-To: volf@oasis.IAEhv.nl's message of "Mon, 13 Aug 2001 16:23:01 +0200 (CEST)"
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volf@oasis.IAEhv.nl (Frank Volf) writes:

> Hi,
> 
> My system panics with a page fault in one of my kernel loadable modules. I
> want to debug this, but I can't find a way to load that module and its
> symbol table into gdb.
> 
> The steps that I have taken are 
> 
> 	gdb -k /sys/compile/DRAWBRIDGE/kernel.debug vmcore.11
> 
> which gives me a normal kenel with debug symbols that I can debug? But, how
> can I load the offending kld module symbol table as well? Or can I only
> properly debug this, when I compile the module into the kernel?

Try following the steps in the developers handbook:

http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug.html

In particular the section 11.6 Debugging Loadable Modules Using GDB:
http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/x4290.html

Rolf

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