From owner-freebsd-questions@FreeBSD.ORG  Thu Apr 28 12:52:45 2005
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id A41F016A4CE
	for <freebsd-questions@freebsd.org>;
	Thu, 28 Apr 2005 12:52:45 +0000 (GMT)
Received: from web41506.mail.yahoo.com (web41506.mail.yahoo.com
	[66.218.93.89])	by mx1.FreeBSD.org (Postfix) with SMTP id 7235243D2F
	for <freebsd-questions@freebsd.org>;
	Thu, 28 Apr 2005 12:52:45 +0000 (GMT)
	(envelope-from weichong78@yahoo.com)
Received: (qmail 59709 invoked by uid 60001); 28 Apr 2005 12:52:45 -0000
Comment: DomainKeys? See http://antispam.yahoo.com/domainkeys
DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws;
	s=s1024; d=yahoo.com;
	b=G2heBK7hX+Q4nCJN+wBv4wDv0hBS6RI6CS446nPaoEJUltSvpWwa19pBbDxOmIrqVeyB6y3+Wlo+TGPwh4xT4gzXU0FMdBmsAhFh33D67UeeuT5weQ8XROXrwyvt7XPg0cd0dtIWL2j3uvblMo5GMYXI3Ebn2nP6JfEPr8WXRvQ=
	;
Message-ID: <20050428125245.59707.qmail@web41506.mail.yahoo.com>
Received: from [219.93.174.108] by web41506.mail.yahoo.com via HTTP;
	Thu, 28 Apr 2005 05:52:45 PDT
Date: Thu, 28 Apr 2005 05:52:45 -0700 (PDT)
From: Wei Chong <weichong78@yahoo.com>
To: freebsd-questions@freebsd.org
In-Reply-To: <20050428120044.F027616A4CF@hub.freebsd.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Subject: crash dump
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>,
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>,
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 28 Apr 2005 12:52:45 -0000

Hi,

I compiled my FreeBSD 5.3-STABLE kernel with 
options KDB, DDB
makeoptions DEBUG="-g"

and wrote a kernel module that does nothing but call
panic() upon its loading, to try experimenting on
crash kernel debugger and crash dump.
Upon kldload the module, KDB was invoked and I was
dropped into a console debugger that let me see the
backtrace by typing "where".
However, when I typed "panic" as suggested by the FAQ,
it doesn't dump anything to my swap device.  Only by
typing "call doadump" in the KDB that it does the job.

I wonder why?

Any help is appreciated.
Thanks.

Yours truly,
Tan, Wei Chong.

__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com