From owner-freebsd-drivers@FreeBSD.ORG  Mon Jun 11 16:49:47 2012
Return-Path: <owner-freebsd-drivers@FreeBSD.ORG>
Delivered-To: freebsd-drivers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 833A5106564A
	for <freebsd-drivers@freebsd.org>; Mon, 11 Jun 2012 16:49:47 +0000 (UTC)
	(envelope-from nagpersonal@gmail.com)
Received: from mail-pb0-f54.google.com (mail-pb0-f54.google.com
	[209.85.160.54])
	by mx1.freebsd.org (Postfix) with ESMTP id 57D9B8FC1B
	for <freebsd-drivers@freebsd.org>; Mon, 11 Jun 2012 16:49:47 +0000 (UTC)
Received: by pbbro2 with SMTP id ro2so6113509pbb.13
	for <freebsd-drivers@freebsd.org>; Mon, 11 Jun 2012 09:49:47 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
	h=mime-version:date:message-id:subject:from:to:content-type;
	bh=Aue1BaIgjRYPS0XWRDBPzd2ElmprvuQ/gBukCYZj3lw=;
	b=KV5FrILSOvMTCZAbVBw9U5D0FUZmew7UK8sw5qUCXCn2xhrIXepddw1Ipi0cECTc59
	SWxJQ1xDUlUckMWcOcTjT6nDX1/gO1ZdrKLCO9M+u21WfSxBHyUuU/lY2eDInS8KSzB+
	tmgn9GM8ZTd47zNL+QhlG38lcIclDeorV26KSkV/U2ILbfOFKXtjMekuiEeR/UGY7tWv
	gw/cPWtiChtbIJGFlCQFAiQTs/YABr7hv3t6mceVdsrronEP8BCANi5PtHYQrCWL0Dxj
	MUL4jlSbVHUxSMCX//I5u6W3VDuwhcrJ4f716+qgu2JszvevhMuxNMhB9ShvoXrxKkxH
	Bh0Q==
MIME-Version: 1.0
Received: by 10.68.193.195 with SMTP id hq3mr28331154pbc.30.1339433387052;
	Mon, 11 Jun 2012 09:49:47 -0700 (PDT)
Received: by 10.66.87.136 with HTTP; Mon, 11 Jun 2012 09:49:46 -0700 (PDT)
Date: Mon, 11 Jun 2012 09:49:46 -0700
Message-ID: <CAKx_80-rdYS8Cb=znMn2m0JDjTe=NxPn3rGbEWBamBUtuLsgnQ@mail.gmail.com>
From: nagarjuna vempati <nagpersonal@gmail.com>
To: freebsd-drivers@freebsd.org
Content-Type: text/plain; charset=ISO-8859-1
X-Content-Filtered-By: Mailman/MimeDel 2.1.5
Subject: Issue with KGDB setup. System freezes when it enters ddb
X-BeenThere: freebsd-drivers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Writing device drivers for FreeBSD <freebsd-drivers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-drivers>, 
	<mailto:freebsd-drivers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-drivers>
List-Post: <mailto:freebsd-drivers@freebsd.org>
List-Help: <mailto:freebsd-drivers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-drivers>,
	<mailto:freebsd-drivers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 11 Jun 2012 16:49:47 -0000

Hello,

Can someone plese help me understand what is the problem?

After fresh disk installation of freeBSD9.0 AMD64 from disk, I copied
/usr/src/sys/am64/conf/GENERIC to KGDBKERNEL and added following lines to
the file

options         GDB
options         DDB
options         KDB_UNATTENDED
options         BREAK_TO_DEBUGGER
options         ALT_BREAK_TO_DEBUGGER

After this I rebuilt the Kernel and installed as below.

make buildworld
make buildkernel kernconf=KGDBKERNEL
make installkernel kernconf=KGDBKERNEL
Reboot into single user mode.
mergemaster -p
make installworld
mergemaster
Reboot.

After this to setup KGDB I am using following document as my reference.
http://chetanbl.blogspot.com/


To break into ddb I am trying issue sysctl debug.kdb.enter=1. Then the
system becomes unresponsive. Also, I tried to enter ddb at booting stage by
issuing boot -d command. Even then system becomes unresponsive.

I need to solve this problem ASAP. Can someone helpme?

Thanks,
Nag