Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752041AbdC0JYm (ORCPT ); Mon, 27 Mar 2017 05:24:42 -0400 Received: from hylle05.itea.ntnu.no ([129.241.56.225]:56042 "EHLO hylle05.itea.ntnu.no" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751608AbdC0JYe (ORCPT ); Mon, 27 Mar 2017 05:24:34 -0400 X-Greylist: delayed 429 seconds by postgrey-1.27 at vger.kernel.org; Mon, 27 Mar 2017 05:24:34 EDT To: linux-kernel@vger.kernel.org From: David Palma Subject: skb_over_panic using UDP and 6lowpan / fakelb Message-ID: <56012235-e1d0-1e5e-840a-cc8d5938c380@ntnu.no> Date: Mon, 27 Mar 2017 11:16:47 +0200 MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="xBG3LnO6jgubuwW4XheKNIEwF7EF75Dff" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2541 Lines: 71 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --xBG3LnO6jgubuwW4XheKNIEwF7EF75Dff Content-Type: multipart/mixed; boundary="jEJvS5MhTTPvPmvk4a8mHOtOchEwEJGxd"; protected-headers="v1" From: David Palma To: linux-kernel@vger.kernel.org Message-ID: <56012235-e1d0-1e5e-840a-cc8d5938c380@ntnu.no> Subject: skb_over_panic using UDP and 6lowpan / fakelb --jEJvS5MhTTPvPmvk4a8mHOtOchEwEJGxd Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable 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=3D195059 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, --=20 David Palma --jEJvS5MhTTPvPmvk4a8mHOtOchEwEJGxd-- --xBG3LnO6jgubuwW4XheKNIEwF7EF75Dff Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEl+q6ZBx359wpOo2MJseEIZzXsVoFAljY2H8ACgkQJseEIZzX sVoQFhAApLRCR9hFrzz2MawqCBWBPAMUk0Er+qPWCxh+odLofIjNwx0TFNPzCYKv BYvAgp3/8IM4BJHCEvwkSoWwlS0AycntxULY956Aav8cfYKQ5/TArWb5iuMg9UsR Y3TNIWPOfXk/pu7qAmpzjsABshY852wgjgTeGvsvUPlzV7DQ7dyDO2sw+WZCknR5 UOTjlfsszXG+eqIsZvn0tGxBFp1czt81FhwOhBJiy5p/ydlhV8OXKOxTkR6kpAkk IX1i4qvD3GDl/+wE9cJqYHvomp9W5ZlEMoMh7lsRsNGrY151xXqCmOOg+HHfGGpO RZeZmt/Y8WU28tjnzTuYb3AauJkNbHUW44gUagps0+Uemkgsd9Bz/Wywfgk0Oi/H lV5Sl7fVxZ4D5d7ZmmWb+n9YUW5lSdSCtuWgi0h5cXsch4C1wYnMuXEFFWldE+g4 EkJj+2Nl5nURU4AUZnxs/aQLte2lpxUka8qhlpKWY6VOxKdkaGO+CVMJjYQj1mb7 Rl3DzEdhyPgc2z9rCfDKohh/micPJ3EOjkPdCyKzx2XGBL1l6nieLyMQ3Ruo4zyA Dd8St9+eYIuvKuFGMMc6OquBi1bnVQ2xcOA09VwL4KvoAgPSNE4fsR6LLDU+b9ar lzObkZaArkOL4sx70LlcTL3XDrjHZUOw64GCY/0ImDqt5d5PZpE= =VoDp -----END PGP SIGNATURE----- --xBG3LnO6jgubuwW4XheKNIEwF7EF75Dff--