From owner-freebsd-current@FreeBSD.ORG  Sun May 17 12:16:41 2009
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@FreeBSD.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id DDF541065694;
	Sun, 17 May 2009 12:16:41 +0000 (UTC)
	(envelope-from nork@FreeBSD.org)
Received: from sakura.ninth-nine.com (ns1.ninth-nine.com [219.127.74.121])
	by mx1.freebsd.org (Postfix) with ESMTP id 851858FC12;
	Sun, 17 May 2009 12:16:41 +0000 (UTC)
	(envelope-from nork@FreeBSD.org)
Received: from nadesico.ninth-nine.com (ns1.ninth-nine.com [219.127.74.121]
	(may be forged)) (authenticated bits=0) by
	sakura.ninth-nine.com (8.14.3/8.14.3/NinthNine) with ESMTP id
	n4HCGZeh004492;
	Sun, 17 May 2009 21:16:40 +0900 (JST) (envelope-from nork@FreeBSD.org)
Date: Sun, 17 May 2009 21:16:35 +0900
From: Norikatsu Shigemura <nork@FreeBSD.org>
To: freebsd-current@FreeBSD.org
Message-Id: <20090517211635.216b23ae.nork@FreeBSD.org>
In-Reply-To: <20090517200019.275f6c71.nork@FreeBSD.org>
References: <20090517200019.275f6c71.nork@FreeBSD.org>
X-Mailer: Sylpheed 2.6.0 (GTK+ 2.16.1; i386-portbld-freebsd8.0)
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Cc: Norikatsu Shigemura <nork@FreeBSD.org>
Subject: Re: panic after dhclient in sys/net/if.c mtx_lock
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>, 
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 17 May 2009 12:16:42 -0000

Hi.

On Sun, 17 May 2009 20:00:19 +0900
Norikatsu Shigemura <nork@FreeBSD.org> wrote:
>     ta_context = 0x0}, if_addr_mtx = {lock_object = {lo_name = 0x0, lo_flags = 0, 
>       lo_data = 0, lo_witness = 0x0}, mtx_lock = 0}, if_clones = {le_next = 0x0, 

	In this time, if_addr_mtx doesn't initilized.

	According to /usr/src/sys/netinet/in.c:921 (UP#14), ifp = &info,
	So I read:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
        /*
         * add a loopback route to self
         */
        if (!(ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) {
                bzero(&info, sizeof(info));
                info.rti_ifp = V_loif;
                info.rti_flags = ia->ia_flags | RTF_HOST | RTF_STATIC;
                info.rti_info[RTAX_DST] = (struct sockaddr *)&ia->ia_addr;
                info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl;
                error = rtrequest1_fib(RTM_ADD, &info, &rt, 0);
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	info.rti_ifp == V_loif (=vnet_net_0._loif), but different:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
(kgdb) p info.rti_ifp
$16 = (struct ifnet *) 0xffffff00050caa00
(kgdb) p vnet_net_0._loif
$17 = (struct ifnet *) 0xffffff0005172000
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

	Of cource, V_loif->if_addr_mtx is initialized.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
(kgdb) p vnet_net_0._loif->if_addr_mtx
$18 = {lock_object = {lo_name = 0xffffffff80576ca1 "if_addr_mtx", lo_flags = 16973824, 
    lo_data = 0, lo_witness = 0x0}, mtx_lock = 4}
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

	Hum.....