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=-8.6 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_PASS,URIBL_BLOCKED,USER_IN_DEF_DKIM_WL 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 9E47CC43381 for ; Thu, 21 Mar 2019 06:01:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6C9DC218A5 for ; Thu, 21 Mar 2019 06:01:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="asZujfjX" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727793AbfCUGBI (ORCPT ); Thu, 21 Mar 2019 02:01:08 -0400 Received: from mail-io1-f68.google.com ([209.85.166.68]:44466 "EHLO mail-io1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727660AbfCUGBH (ORCPT ); Thu, 21 Mar 2019 02:01:07 -0400 Received: by mail-io1-f68.google.com with SMTP id u12so4283379iop.11 for ; Wed, 20 Mar 2019 23:01:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=FPtR+Mv0BsS4tjWXTg1n9CAjOobeYmYcaxR4lx6FSgA=; b=asZujfjXjIN3F1ki9QLI73gdqziMe/LG3PWt/jZ5dlPX7lMsCfhPo0qseY+izmEe5d 1cKPnbxlZmc71xyLz7kch+6rsqPVHQSqMd1hYunERP52IDg/kGtDZVPbzlB9dfZM4ijk dI3XpW5VDOb0XpTJLrkABfHNkj4T1ww+aFSN3h4MePGi5jnlb3WiUuWBDLyHcpudxakg GnfYX3Soj8E1GO/J/Cl82Lvvo72Jso4KhPepQl0BvhWUAkbB8WKrNL00WIY2wMTlFfUe NznG1Y9orS2pfTqLCR6Ip5wEP4MSTCs6GmNiDzB9IqdKD0wKKYsHeekg67IYKhbTN7Q6 hdGg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=FPtR+Mv0BsS4tjWXTg1n9CAjOobeYmYcaxR4lx6FSgA=; b=Vq4Jctwu3uflzEtnAK2wNtixSDWHcKaPcbCFhAUsM7FVRHEzrQC/blgq2BIMuqnBhL uS8bF3vk6VT1KR0cTeTL+shSsYXblulULRfShzbUD+2tAHVy+r0Dsm0TBCPMcEbscYFs /tBNREcTpnpmcjbCIyw3G47YF089B+csWp+ftIPrdHaHVfuTFKfmmxMjKFtzqkP/wP7N bqseT6b/AYXyamsIG8YtAlIfXQ8H4UD09M2+h5mOWSnIRY25PMEIa0LYNRwIYMtqoiCk qS0faoo0FDGQGrksfK309sFA/J2H8h1NW1a0qIQSToNVO8ctLDUCRasEjhBsVO+iIzao sqhA== X-Gm-Message-State: APjAAAUelv6srIJQyOW/vjPJmY0XvK0ojdUml62S4JOJyxKFuzYkPISy yfFeiRkh7IZx/nO5jz9F3urrfZFGzUPnndzY6nEEgg== X-Google-Smtp-Source: APXvYqwh3wzpKkdRJVvdfy0J9d8lyG/oA3+p9VkabiV/oQk+sgAEEXIklU3EV4EHhD4Eldm2Hk7sQX8C5fKNW6DTCOc= X-Received: by 2002:a6b:3709:: with SMTP id e9mr1249753ioa.282.1553148065675; Wed, 20 Mar 2019 23:01:05 -0700 (PDT) MIME-Version: 1.0 References: <0000000000005b7456057a9abc57@google.com> <000000000000c6a7d005848cd56d@google.com> In-Reply-To: <000000000000c6a7d005848cd56d@google.com> From: Dmitry Vyukov Date: Thu, 21 Mar 2019 07:00:54 +0100 Message-ID: Subject: Re: kernel BUG at mm/slab.c:LINE! (3) To: syzbot Cc: David Miller , Alexey Kuznetsov , LKML , netdev , Stefano Brivio , Sabrina Dubroca , syzkaller-bugs , Hideaki YOSHIFUJI Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Mar 20, 2019 at 9:55 PM syzbot wrote: > > syzbot has bisected this bug to: > > commit b8a51b38e4d4dec3e379d52c0fe1a66827f7cf1e > Author: Stefano Brivio > Date: Thu Nov 8 11:19:23 2018 +0000 > > fou, fou6: ICMP error handlers for FoU and GUE > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=161b63cf200000 > start commit: b8a51b38 fou, fou6: ICMP error handlers for FoU and GUE > git tree: net-next > final crash: https://syzkaller.appspot.com/x/report.txt?x=151b63cf200000 > console output: https://syzkaller.appspot.com/x/log.txt?x=111b63cf200000 > kernel config: https://syzkaller.appspot.com/x/.config?x=4a0a89f12ca9b0f5 > dashboard link: https://syzkaller.appspot.com/bug?extid=2182db487a523d86bf34 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=148d46d5400000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15c6a225400000 > > Reported-by: syzbot+2182db487a523d86bf34@syzkaller.appspotmail.com > Fixes: b8a51b38 ("fou, fou6: ICMP error handlers for FoU and GUE") That commit caused lots of crashes that look completely differently. Now all that is fixed. The last crash for this bugs happened 2+ months ago. So let's just do: #syz fix: fou: Prevent unbounded recursion in GUE error handler also with UDP-Lite