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,URIBL_BLOCKED, USER_AGENT_SANE_1 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 AF7F5C2D0EC for ; Fri, 27 Mar 2020 03:00:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 919A1206F6 for ; Fri, 27 Mar 2020 03:00:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727766AbgC0DAS (ORCPT ); Thu, 26 Mar 2020 23:00:18 -0400 Received: from mail-pg1-f193.google.com ([209.85.215.193]:36702 "EHLO mail-pg1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726496AbgC0DAS (ORCPT ); Thu, 26 Mar 2020 23:00:18 -0400 Received: by mail-pg1-f193.google.com with SMTP id j29so3912118pgl.3; Thu, 26 Mar 2020 20:00:17 -0700 (PDT) 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:from:autocrypt:message-id :date:user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=A8L7pOMKHT1Fvn5n/xgz4DQpKiNCVTukpmYePSYE6CA=; b=jdziiDbOCRXE/h3X1N2+SYeOkyOd1+KTWjqMa2AAHQTHsjs+KoftS9aj3xlXb6pS6V bWPW/wxneFZ72Y6kohjVpzXIFTvGqIsa89E9Eqd0nmhKUhBIx/FCFOGFZ+3AGdNcXbP5 zLy0BBZBJ2HVIIuVWjQc3cteOn0OXEHcCcrtcfHKvcMPK3EPrBHgpFAkvocEGkhfEL6c 0onFQCYH0bY3DxyYIoikAymiLVNxoJoMKkq+GqHACZ9/tDZ6azla5gVCXH2LtBfPUi74 lSeMGHXHZ5b6nXL4rdImITz/57+4OUucv5+rkgsv6wXVC/Mfpo8tOo95LaixJtSTbQBx Ld8Q== X-Gm-Message-State: ANhLgQ1iO1J7MZyn10JjPyPNN14fuBdJiZWNgq5MfO0ymM5ntV9mXF38 wkZhxOdCg2viEC0Wq4GXubc= X-Google-Smtp-Source: ADFU+vsvK0eP4Uqeyd1/ByCifUDiaGERpiXtrwFTIu/opIyVLOq497xPOF0F6FhTPWo15KgCVy2gKQ== X-Received: by 2002:a63:f454:: with SMTP id p20mr11997394pgk.149.1585278017059; Thu, 26 Mar 2020 20:00:17 -0700 (PDT) Received: from ?IPv6:2601:647:4000:d7:f4c2:6961:f3fb:2dca? ([2601:647:4000:d7:f4c2:6961:f3fb:2dca]) by smtp.gmail.com with ESMTPSA id f22sm2727805pgl.20.2020.03.26.20.00.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 26 Mar 2020 20:00:16 -0700 (PDT) Subject: Re: KASAN: null-ptr-deref Write in blk_mq_map_swqueue To: syzbot , a@unstable.cc, axboe@kernel.dk, b.a.t.m.a.n@lists.open-mesh.org, davem@davemloft.net, dongli.zhang@oracle.com, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, mareklindner@neomailbox.ch, netdev@vger.kernel.org, sven@narfation.org, sw@simonwunderlich.de, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk References: <0000000000004760b805a1cc03fc@google.com> 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: <60bb3266-03fb-acfc-d285-b0249bb5e57d@acm.org> Date: Thu, 26 Mar 2020 20:00:15 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <0000000000004760b805a1cc03fc@google.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2020-03-26 18:28, syzbot wrote: > syzbot has bisected this bug to: > > commit 768134d4f48109b90f4248feecbeeb7d684e410c > Author: Jens Axboe > Date: Mon Nov 11 03:30:53 2019 +0000 > > io_uring: don't do flush cancel under inflight_lock > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14233ef5e00000 > start commit: 1b649e0b Merge git://git.kernel.org/pub/scm/linux/kernel/g.. > git tree: upstream > final crash: https://syzkaller.appspot.com/x/report.txt?x=16233ef5e00000 > console output: https://syzkaller.appspot.com/x/log.txt?x=12233ef5e00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=27392dd2975fd692 > dashboard link: https://syzkaller.appspot.com/bug?extid=313d95e8a7a49263f88d > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13850447e00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=119a26f5e00000 > > Reported-by: syzbot+313d95e8a7a49263f88d@syzkaller.appspotmail.com > Fixes: 768134d4f481 ("io_uring: don't do flush cancel under inflight_lock") > > For information about bisection process see: https://goo.gl/tpsmEJ#bisection #syz fix: blk-mq: Fix a recently introduced regression in blk_mq_realloc_hw_ctxs()