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Date: Tue, 1 Mar 2005 03:51:05 +0000
From: Joseph Koshy <joseph.koshy@gmail.com>
To: river_robert@yahoo.com.cn
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cc: freebsd-hackers <freebsd-hackers@freebsd.org>
Subject: Re: Help about debugging FreeBSD kernel core dump file
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> How can I debug the core dump file created by kernel panic? I try to use "gdb -core vmcore.0" (vmcore.0 is 4G file because I have 4G memory) and the gdb said: this is not a vaild core file. Why?

AFAIK  you have to use 'gdb -k' (or 'kgdb') to use GDB's kernel debugging mode.

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FreeBSD Volunteer, http://people.freebsd.org/~jkoshy