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=-7.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=unavailable 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 D0E49C43603 for ; Thu, 19 Dec 2019 05:00:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B18B8222C2 for ; Thu, 19 Dec 2019 05:00:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726155AbfLSFAY (ORCPT ); Thu, 19 Dec 2019 00:00:24 -0500 Received: from mail-pg1-f194.google.com ([209.85.215.194]:45142 "EHLO mail-pg1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725987AbfLSFAY (ORCPT ); Thu, 19 Dec 2019 00:00:24 -0500 Received: by mail-pg1-f194.google.com with SMTP id b9so2440654pgk.12; Wed, 18 Dec 2019 21:00:24 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:cc:from:autocrypt :message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=g7u7M8qJMOVgBJaM2MBNP0fTnIjXWTjo4K/cUGZgSpY=; b=NqYENaakp/NKOOIYSemTf45CUqxRvV3wMQKIvqvAETLEG2u/R5QZ8N29E/JpraFV6q nWZLVatHEJPfcayh37qfmSxiu/Fq765hfHx0p/hG6tbTX+Ij//0pvf7qlqZZk3HTPSuz eyge4Z1DnlI227pG0D1AFQ2RK3gnMKQDPX3lWvsSgzDD+gJyagRTALIqq3Cp8nCIStEo CZpCJ+rgX66C4GxnnG/uhdd5thf1VOCVChMK1MbAcbdnnJ3pf0RgGN+0OIZzFU6wAI+r LKF9nQW8U/EYAXHuv9vf44MOBKLv5R3LUIpD6WgUMsrHg1L2X6F+co9/sEu6tvJ0oabd 7j2Q== X-Gm-Message-State: APjAAAXF/OnZc3hY2ZlVLfDsou5y3Lo6sTio82oE9Xmop1K+qDwIq8NA svPJ8JUJshbgCLZd33xzzkQ= X-Google-Smtp-Source: APXvYqzrchZp4IVjqJtkB+T3s1vmskPzQuKNoxzKqezHXHEJ0b+KslSmNNEJF62Swk4LR1ZMRP7c9w== X-Received: by 2002:a63:1a1c:: with SMTP id a28mr7364030pga.374.1576731623735; Wed, 18 Dec 2019 21:00:23 -0800 (PST) Received: from ?IPv6:2601:647:4000:1108:5490:c75a:2158:20b3? ([2601:647:4000:1108:5490:c75a:2158:20b3]) by smtp.gmail.com with ESMTPSA id u20sm5030655pgf.29.2019.12.18.21.00.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 18 Dec 2019 21:00:22 -0800 (PST) Subject: Re: kernel BUG at fs/buffer.c:LINE! To: jaegeuk@kernel.org References: <0000000000009716290599fcd496@google.com> Cc: axboe@kernel.dk, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk From: Bart Van Assche Autocrypt: addr=bvanassche@acm.org; prefer-encrypt=mutual; keydata= mQENBFSOu4oBCADcRWxVUvkkvRmmwTwIjIJvZOu6wNm+dz5AF4z0FHW2KNZL3oheO3P8UZWr LQOrCfRcK8e/sIs2Y2D3Lg/SL7qqbMehGEYcJptu6mKkywBfoYbtBkVoJ/jQsi2H0vBiiCOy fmxMHIPcYxaJdXxrOG2UO4B60Y/BzE6OrPDT44w4cZA9DH5xialliWU447Bts8TJNa3lZKS1 AvW1ZklbvJfAJJAwzDih35LxU2fcWbmhPa7EO2DCv/LM1B10GBB/oQB5kvlq4aA2PSIWkqz4 3SI5kCPSsygD6wKnbRsvNn2mIACva6VHdm62A7xel5dJRfpQjXj2snd1F/YNoNc66UUTABEB AAG0JEJhcnQgVmFuIEFzc2NoZSA8YnZhbmFzc2NoZUBhY20ub3JnPokBOQQTAQIAIwUCVI67 igIbAwcLCQgHAwIBBhUIAgkKCwQWAgMBAh4BAheAAAoJEHFcPTXFzhAJ8QkH/1AdXblKL65M Y1Zk1bYKnkAb4a98LxCPm/pJBilvci6boefwlBDZ2NZuuYWYgyrehMB5H+q+Kq4P0IBbTqTa jTPAANn62A6jwJ0FnCn6YaM9TZQjM1F7LoDX3v+oAkaoXuq0dQ4hnxQNu792bi6QyVdZUvKc macVFVgfK9n04mL7RzjO3f+X4midKt/s+G+IPr4DGlrq+WH27eDbpUR3aYRk8EgbgGKvQFdD CEBFJi+5ZKOArmJVBSk21RHDpqyz6Vit3rjep7c1SN8s7NhVi9cjkKmMDM7KYhXkWc10lKx2 RTkFI30rkDm4U+JpdAd2+tP3tjGf9AyGGinpzE2XY1K5AQ0EVI67igEIAKiSyd0nECrgz+H5 PcFDGYQpGDMTl8MOPCKw/F3diXPuj2eql4xSbAdbUCJzk2ETif5s3twT2ER8cUTEVOaCEUY3 eOiaFgQ+nGLx4BXqqGewikPJCe+UBjFnH1m2/IFn4T9jPZkV8xlkKmDUqMK5EV9n3eQLkn5g lco+FepTtmbkSCCjd91EfThVbNYpVQ5ZjdBCXN66CKyJDMJ85HVr5rmXG/nqriTh6cv1l1Js T7AFvvPjUPknS6d+BETMhTkbGzoyS+sywEsQAgA+BMCxBH4LvUmHYhpS+W6CiZ3ZMxjO8Hgc ++w1mLeRUvda3i4/U8wDT3SWuHcB3DWlcppECLkAEQEAAYkBHwQYAQIACQUCVI67igIbDAAK CRBxXD01xc4QCZ4dB/0QrnEasxjM0PGeXK5hcZMT9Eo998alUfn5XU0RQDYdwp6/kMEXMdmT oH0F0xB3SQ8WVSXA9rrc4EBvZruWQ+5/zjVrhhfUAx12CzL4oQ9Ro2k45daYaonKTANYG22y //x8dLe2Fv1By4SKGhmzwH87uXxbTJAUxiWIi1np0z3/RDnoVyfmfbbL1DY7zf2hYXLLzsJR mSsED/1nlJ9Oq5fALdNEPgDyPUerqHxcmIub+pF0AzJoYHK5punqpqfGmqPbjxrJLPJfHVKy goMj5DlBMoYqEgpbwdUYkH6QdizJJCur4icy8GUNbisFYABeoJ91pnD4IGei3MTdvINSZI5e Message-ID: <31033055-c245-4eda-2814-3fd8b0d59cb9@acm.org> Date: Wed, 18 Dec 2019 21:00:21 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.3.0 MIME-Version: 1.0 In-Reply-To: <0000000000009716290599fcd496@google.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On 2019-12-18 08:21, syzbot wrote: > syzbot has bisected this bug to: > > commit 5db470e229e22b7eda6e23b5566e532c96fb5bc3 > Author: Jaegeuk Kim > Date:   Thu Jan 10 03:17:14 2019 +0000 > >     loop: drop caches if offset or block_size are changed > > bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=13f3ca8ee00000 > start commit:   2187f215 Merge tag 'for-5.5-rc2-tag' of > git://git.kernel.o.. > git tree:       upstream > final crash:    https://syzkaller.appspot.com/x/report.txt?x=100bca8ee00000 > console output: https://syzkaller.appspot.com/x/log.txt?x=17f3ca8ee00000 > kernel config:  https://syzkaller.appspot.com/x/.config?x=dcf10bf83926432a > dashboard link: > https://syzkaller.appspot.com/bug?extid=cfed5b56649bddf80d6e > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1171ba8ee00000 > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=107440aee00000 Hi Jaegeuk, Since syzbot has identified a reproducer I think that it's easy to test whether your new patch fixes what syzbot discovered. Have you already had the chance to test this? Thanks, Bart.