From owner-freebsd-hackers@FreeBSD.ORG Sat May 9 18:02:59 2015 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 90464DF9 for ; Sat, 9 May 2015 18:02:59 +0000 (UTC) Received: from mail.ignoranthack.me (ignoranthack.me [199.102.79.106]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 73CE5119D for ; Sat, 9 May 2015 18:02:59 +0000 (UTC) Received: from [192.168.200.208] (unknown [50.136.155.142]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: sbruno@ignoranthack.me) by mail.ignoranthack.me (Postfix) with ESMTPSA id 5BC00192906 for ; Sat, 9 May 2015 18:02:58 +0000 (UTC) Message-ID: <554E4BD1.1030802@ignoranthack.me> Date: Sat, 09 May 2015 11:02:57 -0700 From: Sean Bruno Reply-To: sbruno@freebsd.org User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0 MIME-Version: 1.0 To: freebsd-hackers@freebsd.org Subject: Re: How to get anything useful out of kgdb? References: <554E41EE.2010202@ignoranthack.me> In-Reply-To: <554E41EE.2010202@ignoranthack.me> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 09 May 2015 18:02:59 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 On 05/09/15 10:20, Sean Bruno wrote: > > tl;dr What are the kernel config options to get good output of > kgdb? > > > I'm trying to get the ability to debug and display internal > variables, as one does, with kgdb. I'm *must* be doing this wrong > as I cannot get any useful output from accessing variables that > were JUST accessed in order to invoke a panic() that I have > inserted. This is a GENERIC kernel without INVARIANTS and without > WITNESS: > > https://people.freebsd.org/~sbruno/wtf_kgdb.txt > > I seem to have debug enabled and am able to browse source, but I > obviously haven't compiled correctly as things are optimized out. > Just to see what the arguments to make are when building, I touched if_em.c and did a NOCLEAN rebuild. What I see is this: https://people.freebsd.org/~sbruno/wtf_make.txt Should -02 and -g do anything useful here when compiling? Do I need to drop the optimization flags? sean -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQF8BAEBCgBmBQJVTkvOXxSAAAAAAC4AKGlzc3Vlci1mcHJAbm90YXRpb25zLm9w ZW5wZ3AuZmlmdGhob3JzZW1hbi5uZXRCQUFENDYzMkU3MTIxREU4RDIwOTk3REQx MjAxRUZDQTFFNzI3RTY0AAoJEBIB78oecn5k1noIAKfpfYVyhMDpCGPl97to81F+ URoq0Clm+Ptw2eIq89g8HNqy6k958PSOyL7SgPjYRTlu96DixkOm3YOPBaH/iWe4 B5SaZGeMwM6gVpyPXp3SkO0+QcDLsj5mlx15QQFCKH9X60J/BhWDzsfXj+84IJDD 2DDsv9ZPhVRnNzzJ2XLNwo8H10+IG/lXUvCIFRDLALKYOgLd+Oy/BKJ2ddhgrVvm y0utNy7N0G3edKKvbXZ8O/HsSecSfM0ttHIpXVJrZp05JxxSJ7WttZzQB8HSe8si niEjSrp4zBsUMM139DzKZWIHEFNBAUx+pxLyxOHOXtRcVzuSC+IcrvErwI2Lg28= =DMDN -----END PGP SIGNATURE-----