Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3177CC433F5 for ; Wed, 5 Jan 2022 14:05:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240526AbiAEOFM (ORCPT ); Wed, 5 Jan 2022 09:05:12 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36420 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237035AbiAEOFH (ORCPT ); Wed, 5 Jan 2022 09:05:07 -0500 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8D036C061784 for ; Wed, 5 Jan 2022 06:05:07 -0800 (PST) Received: from gallifrey.ext.pengutronix.de ([2001:67c:670:201:5054:ff:fe8d:eefb] helo=bjornoya.blackshift.org) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1n56uH-0000CK-Ba; Wed, 05 Jan 2022 15:04:49 +0100 Received: from pengutronix.de (2a03-f580-87bc-d400-7899-4998-133d-b4b9.ip6.dokom21.de [IPv6:2a03:f580:87bc:d400:7899:4998:133d:b4b9]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) (Authenticated sender: mkl-all@blackshift.org) by smtp.blackshift.org (Postfix) with ESMTPSA id 5F8C96D1A43; Wed, 5 Jan 2022 14:04:44 +0000 (UTC) Date: Wed, 5 Jan 2022 15:04:43 +0100 From: Marc Kleine-Budde To: Eric Dumazet Cc: syzbot , anthony.l.nguyen@intel.com, changbin.du@intel.com, Christian Brauner , David Miller , Eric Dumazet , Jesper Dangaard Brouer , Heiner Kallweit , intel-wired-lan-owner@osuosl.org, intel-wired-lan@lists.osuosl.org, Jesse Brandeburg , Jakub Kicinski , linux-can@vger.kernel.org, LKML , netdev , Oliver Hartkopp , syzkaller-bugs , Yajun Deng Subject: Re: [syzbot] kernel BUG in pskb_expand_head Message-ID: <20220105140443.vwobz3yx4z3rux6a@pengutronix.de> References: <0000000000007ea16705d0cfbb53@google.com> <000000000000c7845605d4d3f0a0@google.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="72ar6nyolsauz65r" Content-Disposition: inline In-Reply-To: X-SA-Exim-Connect-IP: 2001:67c:670:201:5054:ff:fe8d:eefb X-SA-Exim-Mail-From: mkl@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-kernel@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --72ar6nyolsauz65r Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On 05.01.2022 05:59:35, Eric Dumazet wrote: > On Wed, Jan 5, 2022 at 3:20 AM syzbot > wrote: > > > > syzbot has found a reproducer for the following issue on: > > > > HEAD commit: c9e6606c7fe9 Linux 5.16-rc8 > > git tree: upstream > > console output: https://syzkaller.appspot.com/x/log.txt?x=3D148351c3b00= 000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=3D32f9fa260d7= 413b4 > > dashboard link: https://syzkaller.appspot.com/bug?extid=3D4c63f36709a64= 2f801c5 > > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binu= tils for Debian) 2.35.2 > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=3D15435e2bb= 00000 > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=3D12f4508db00= 000 > > >=20 > This C repro looks legit, bug should be in CAN layer. ACK - it's bug in CAN's ISOTP > > The issue was bisected to: > > > > commit e4b8954074f6d0db01c8c97d338a67f9389c042f > > Author: Eric Dumazet > > Date: Tue Dec 7 01:30:37 2021 +0000 > > > > netlink: add net device refcount tracker to struct ethnl_req_info >=20 > Ignore this bisection, an unrelated commit whent in its way. ACK - We have a RFC fix for this: https://lore.kernel.org/all/20220105132429.1170627-1-mkl@pengutronix.de regards, Marc --=20 Pengutronix e.K. | Marc Kleine-Budde | Embedded Linux | https://www.pengutronix.de | Vertretung West/Dortmund | Phone: +49-231-2826-924 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | --72ar6nyolsauz65r Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAABCgAdFiEEK3kIWJt9yTYMP3ehqclaivrt76kFAmHVpXkACgkQqclaivrt 76m+pAf+M8hsvuG1OEtF6bw1HNGyTla1VDEhL4hbgurkpql5872fKSOA+ROtuCKi I2gOI0cqp/kJNzH1fdIQuiXuIqaM1f38sXb3q51Ng9TsXpk82Rd3FHpHK698t/Rq ImxBIWHEQWzGgIYcRfP/WKh2dsNzLyW4dFo4hmPMuacEluVI7JAmr/dU1OvXebH0 1D1Z63rR37GOnQL9M/Sh2oY29UC/n5a4BDMC42en3Wb+5vMEPEH5S/AjvG1MBzen YlCkkIEhyHM2DqN9jaXG6/rbaz5ckPxaEm+ES3xNDg9aHSS0zLi/Ct9nyrl5tJlm KXMaxmP7EmEYr1W9XIVrHhZVs5h2aQ== =1PmX -----END PGP SIGNATURE----- --72ar6nyolsauz65r--