From owner-freebsd-net@FreeBSD.ORG  Sun Feb 13 07:40:11 2011
Return-Path: <owner-freebsd-net@FreeBSD.ORG>
Delivered-To: freebsd-net@hub.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 7F2591065673
	for <freebsd-net@hub.freebsd.org>; Sun, 13 Feb 2011 07:40:11 +0000 (UTC)
	(envelope-from gnats@FreeBSD.org)
Received: from freefall.freebsd.org (freefall.freebsd.org
	[IPv6:2001:4f8:fff6::28])
	by mx1.freebsd.org (Postfix) with ESMTP id 5559A8FC12
	for <freebsd-net@hub.freebsd.org>; Sun, 13 Feb 2011 07:40:11 +0000 (UTC)
Received: from freefall.freebsd.org (localhost [127.0.0.1])
	by freefall.freebsd.org (8.14.4/8.14.4) with ESMTP id p1D7eBcW051053
	for <freebsd-net@freefall.freebsd.org>; Sun, 13 Feb 2011 07:40:11 GMT
	(envelope-from gnats@freefall.freebsd.org)
Received: (from gnats@localhost)
	by freefall.freebsd.org (8.14.4/8.14.4/Submit) id p1D7eBk7051052;
	Sun, 13 Feb 2011 07:40:11 GMT (envelope-from gnats)
Date: Sun, 13 Feb 2011 07:40:11 GMT
Message-Id: <201102130740.p1D7eBk7051052@freefall.freebsd.org>
To: freebsd-net@FreeBSD.org
From: Arnaud Lacombe <lacombar@gmail.com>
Cc: 
Subject: Re: kern/154676: [netgraph] [panic] HEAD, 8.1-RELEASE panic after
 some play with netgraph
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
Reply-To: Arnaud Lacombe <lacombar@gmail.com>
List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
	<mailto:freebsd-net-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-net>
List-Post: <mailto:freebsd-net@freebsd.org>
List-Help: <mailto:freebsd-net-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
	<mailto:freebsd-net-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 13 Feb 2011 07:40:11 -0000

The following reply was made to PR kern/154676; it has been noted by GNATS.

From: Arnaud Lacombe <lacombar@gmail.com>
To: bug-followup@FreeBSD.org, sergey.dyatko@gmail.com
Cc:  
Subject: Re: kern/154676: [netgraph] [panic] HEAD, 8.1-RELEASE panic after
 some play with netgraph
Date: Sun, 13 Feb 2011 02:03:34 -0500

 Playing a bit with that bug; an INVARIANTS-enabled kernel (9-CURRENT)
 crashes with:
 
 panic: ng_snd_item: no mbuf packet header!
 
 because the mbuf returned by soreceive() does not have M_PKTHDR set,
 while the expected data is present in the mbuf. 7.1 does set the flag:
 
 Adding an m_print() right after soreceive() in ng_ksocket_incoming2() gives:
 
 FreeBSD -current (on 127.0.0.1:25):
 mbuf: 0xc1d7b200 len: 81, next: 0, 0, 32-32-30-...
 
 FreeBSD 7.1 (on 127.0.0.1:22)
 mbuf: 0xc6d47400 len: 40, next: 0, 2<pkthdr>, 53-53-48-...
 
 both stack uses soreceive_generic(),