Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754150AbdDCRaU (ORCPT ); Mon, 3 Apr 2017 13:30:20 -0400 Received: from mail-wr0-f170.google.com ([209.85.128.170]:33794 "EHLO mail-wr0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752915AbdDCRaR (ORCPT ); Mon, 3 Apr 2017 13:30:17 -0400 MIME-Version: 1.0 In-Reply-To: <56012235-e1d0-1e5e-840a-cc8d5938c380@ntnu.no> References: <56012235-e1d0-1e5e-840a-cc8d5938c380@ntnu.no> From: Cong Wang Date: Mon, 3 Apr 2017 10:29:55 -0700 Message-ID: Subject: Re: skb_over_panic using UDP and 6lowpan / fakelb To: David Palma Cc: LKML , Linux Kernel Network Developers , aar@pengutronix.de, stefan@osg.samsung.com, linux-wpan@vger.kernel.org Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1075 Lines: 35 (Cc'ing netdev and maintainers) On Mon, Mar 27, 2017 at 2:16 AM, David Palma wrote: > > Hi, > > Sending a simple UDP packet (39 bytes long), over a 6lowpan interface > (using fakelb), creates a kernel panic (skb_over_panic). > > Steps to reproduce, and more details, can be found in: > https://github.com/PalmaITEM/6lowpan-skb_over_panic > > This bug has been reported in > https://bugzilla.kernel.org/show_bug.cgi?id=195059 > > I have found that lengths around 39 bytes can also trigger this > behaviour and that longer packets are handled without problem. > > Verified in: > > - Linux version 4.9.0-0.bpo.2-amd64 (debian-kernel@lists.debian.org) > (gcc version 4.9.2 (Debian 4.9.2-10) ) #1 SMP Debian 4.9.13-1~bpo8+1 > (2017-02-27) > - Linux version 4.10.4-1-ARCH (builduser@tobias) (gcc version 6.3.1 > 20170306 (GCC) ) #1 SMP PREEMPT Sat Mar 18 19:39:18 CET 2017 > > > I am not familiar with the process of reporting kernel bugs, so > apologies beforehand. I am also available to provide any missing > information. > > Cheers, > -- > David Palma >