From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0A18CC43387 for ; Fri, 4 Jan 2019 10:54:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C7D992173B for ; Fri, 4 Jan 2019 10:54:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727181AbfADKyq (ORCPT ); Fri, 4 Jan 2019 05:54:46 -0500 Received: from mx1.redhat.com ([209.132.183.28]:35732 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725958AbfADKyp (ORCPT ); Fri, 4 Jan 2019 05:54:45 -0500 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E2EE97AE9A; Fri, 4 Jan 2019 10:54:44 +0000 (UTC) Received: from localhost (ovpn-200-16.brq.redhat.com [10.40.200.16]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 63C035D6A9; Fri, 4 Jan 2019 10:54:41 +0000 (UTC) Date: Fri, 4 Jan 2019 11:54:35 +0100 From: Stefano Brivio To: Dmitry Vyukov Cc: Willem de Bruijn , Eric Dumazet , syzbot , David Miller , Alexey Kuznetsov , linux-kernel , Network Development , syzkaller-bugs , Hideaki YOSHIFUJI Subject: Re: kernel panic: stack is corrupted in udp4_lib_lookup2 Message-ID: <20190104115435.478b4b4a@redhat.com> In-Reply-To: References: <000000000000513fb7057e8d7013@google.com> <20190103210743.6518841e@redhat.com> <20190103225404.66b0ec9f@redhat.com> Organization: Red Hat MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.25]); Fri, 04 Jan 2019 10:54:45 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 4 Jan 2019 11:32:12 +0100 Dmitry Vyukov wrote: > On Thu, Jan 3, 2019 at 10:54 PM Stefano Brivio wrote: > > > > On Thu, 3 Jan 2019 15:15:06 -0600 > > Willem de Bruijn wrote: > > > > > syzbot generated stack traces with > > > > > > [ 183.517380] udpv6_err+0x46/0x60 > > > [ 183.520739] ? __udp6_lib_err+0x1890/0x1890 > > > [ 183.525054] gue6_err_proto_handler+0x199/0x280 > > > > Where? I can't find that in any logs linked from the dashboard at > > https://syzkaller.appspot.com/bug?extid=4ad25edc7a33e4ab91e0 :( > > Stefano, there are these 4 bugs reported that have similarly looking > reproducers involving udp sockets and that crash modes that looks like > stack corruption/overflow: > > https://syzkaller.appspot.com/bug?extid=14005fa30c9a07192934 > https://syzkaller.appspot.com/bug?extid=d14090007dc9ba5fa9b7 > https://syzkaller.appspot.com/bug?extid=137ed32ec9a6d5b0d5fe > https://syzkaller.appspot.com/bug?id=d5bc3e0c66d200d72216ab343a67c4327e4a3452 > > Are these the same bug as this? Judging from the reproducers for the first three, they seem to be. I guess I can trigger tests also for those by sending a (sharp)syz test ... e-mail with the patch to the Reported-by: addresses, right? And the three reports you pointed out from the pile of corrupted reports also seem to match, others look unrelated. -- Stefano