From owner-cvs-src@FreeBSD.ORG  Wed Aug  3 16:44:35 2005
Return-Path: <owner-cvs-src@FreeBSD.ORG>
X-Original-To: cvs-src@FreeBSD.org
Delivered-To: cvs-src@FreeBSD.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id DD4EC16A423;
	Wed,  3 Aug 2005 16:44:35 +0000 (GMT)
	(envelope-from gallatin@cs.duke.edu)
Received: from duke.cs.duke.edu (duke.cs.duke.edu [152.3.140.1])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 4CC5143D48;
	Wed,  3 Aug 2005 16:44:33 +0000 (GMT)
	(envelope-from gallatin@cs.duke.edu)
Received: from grasshopper.cs.duke.edu (grasshopper.cs.duke.edu [152.3.145.30])
	by duke.cs.duke.edu (8.13.4/8.13.4) with ESMTP id j73GiWCh014183
	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO);
	Wed, 3 Aug 2005 12:44:32 -0400 (EDT)
Received: (from gallatin@localhost)
	by grasshopper.cs.duke.edu (8.12.9p2/8.12.9/Submit) id j73GiRI5065244; 
	Wed, 3 Aug 2005 12:44:27 -0400 (EDT) (envelope-from gallatin)
Date: Wed, 3 Aug 2005 12:44:27 -0400
From: Andrew Gallatin <gallatin@cs.duke.edu>
To: Robert Watson <rwatson@FreeBSD.org>
Message-ID: <20050803124427.A65214@grasshopper.cs.duke.edu>
References: <200508030427.j734ReCC049031@repoman.freebsd.org>
	<20050803123129.W16482@fledge.watson.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
User-Agent: Mutt/1.2.5i
In-Reply-To: <20050803123129.W16482@fledge.watson.org>;
	from rwatson@FreeBSD.org on Wed, Aug 03, 2005 at 12:33:00PM +0100
X-Operating-System: FreeBSD 4.9-RELEASE-p1 on an i386
Cc: cvs-src@FreeBSD.org
Subject: Re: cvs commit: src/sys/alpha/alpha db_trace.c src/sys/arm/arm
	db_trace.c src/sys/conf files src/sys/i386/i386 db_trace.c
	src/sys/ia64/ia64 db_trace.c src/sys/kern subr_stack.c
	src/sys/powerpc/powerpc db_trace.c src/sys/sparc64/sparc64 ...
X-BeenThere: cvs-src@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: CVS commit messages for the src tree <cvs-src.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src>,
	<mailto:cvs-src-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/cvs-src>
List-Post: <mailto:cvs-src@freebsd.org>
List-Help: <mailto:cvs-src-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src>,
	<mailto:cvs-src-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 03 Aug 2005 16:44:36 -0000

Robert Watson [rwatson@FreeBSD.org] wrote:
> 
> On Wed, 3 Aug 2005, Jeff Roberson wrote:
> 
> >  Added files:
> >    sys/kern             subr_stack.c
> >    sys/sys              stack.h
> >  Log:
> >   - Add support for saving stack traces and displaying them via printf(9)
> >     and KTR.
> >
> >  Contributed by:         Antoine Brodin <antoine.brodin@laposte.net>
> >  Concept code from:      Neal Fachan <neal@isilon.com>
> 
> This sounds really great.  I have a local /usr/src/sys/kern/kern_utrace.c 
> for back-tracing user application stacks that I find quite useful -- I 
> wonder if we could extend this to also work with user thread stacks?  It 
> can be quite handy for determining how an application reached a 
> particularly obscure kernel state.  It doesn't do the ELF magic, but does 
> reach into VM to determine what object+offset backs each page pointed to 
> by a return address.

How close is your kern_utrace.c to something that could be 
used to make a (MacOSX like) crashreporterd deamon which saves
application stack traces when an application crashes?

Drew