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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 54A34C433F5 for ; Sun, 31 Oct 2021 22:59:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 23EDD60F4F for ; Sun, 31 Oct 2021 22:59:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230232AbhJaXBj (ORCPT ); Sun, 31 Oct 2021 19:01:39 -0400 Received: from mail-io1-f70.google.com ([209.85.166.70]:50947 "EHLO mail-io1-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230125AbhJaXBi (ORCPT ); Sun, 31 Oct 2021 19:01:38 -0400 Received: by mail-io1-f70.google.com with SMTP id u20-20020a5ec014000000b005df4924e18dso11349580iol.17 for ; Sun, 31 Oct 2021 15:59:06 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:date:in-reply-to:message-id:subject :from:to; bh=zmKZGqzh8fouPbLaed+gBxcWLHzsUh8p7n964ZC6uwc=; b=nVNy6duBwVECRlUogKtriZz6hExt7w/vk1TzhBLLJ1ocgO8MRnEd9CBlXLGE3JEuoF 8teuzDRQuoIXFy6SS8GjWupQFVgnLtUdjhhwu+42Jlb19kQjL3ircb42uhxncqGyoszm MAssXW/fysZvOJ0I9//aB2GE9l+U585heIIjZ3F29p2sJZP5A9IFhNpBalurXvKT0TgX 4b2QjQhgqGNtfuRoOXJa2jg2IgNMaGZ8mLNSVrNAEdmAfCAWTmUivdtDc7ZAdHmQNgJl IXqWZPsqkeebX/niDAn/88a/xaUM2gLfdXqdZXJ69nmlzkb06wSurm5bl93mdA5CSx2c MNYQ== X-Gm-Message-State: AOAM531puO3jxAZVbTMXwPRhQKi+RiryiT9foqoE9HP1HN5WtgbeOM2E 0lMgiQfBKsQ9ngbGSCBOW+PHMoLFbfkSmPgA9YA9ih4MH8xE X-Google-Smtp-Source: ABdhPJywbfOpwWGX+8twysh9JnZdNyAmjt8vM3QTfSudoVwDDOBb7qmmPAVA7hKN+so8+5aTSnSyrEftThdLX7EqHh1cLqN9uIid MIME-Version: 1.0 X-Received: by 2002:a05:6638:d53:: with SMTP id d19mr18923597jak.123.1635721146351; Sun, 31 Oct 2021 15:59:06 -0700 (PDT) Date: Sun, 31 Oct 2021 15:59:06 -0700 In-Reply-To: <000000000000fba7bd05cf7eb8f5@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000e143c505cfae0138@google.com> Subject: Re: [syzbot] KASAN: use-after-free Write in __io_free_req From: syzbot To: asml.silence@gmail.com, axboe@kernel.dk, io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, xiaoguang.wang@linux.alibaba.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org syzbot has bisected this issue to: commit 34ced75ca1f63fac6148497971212583aa0f7a87 Author: Xiaoguang Wang Date: Mon Oct 25 05:38:48 2021 +0000 io_uring: reduce frequent add_wait_queue() overhead for multi-shot poll request bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14f83bbab00000 start commit: bdcc9f6a5682 Add linux-next specific files for 20211029 git tree: linux-next final oops: https://syzkaller.appspot.com/x/report.txt?x=16f83bbab00000 console output: https://syzkaller.appspot.com/x/log.txt?x=12f83bbab00000 kernel config: https://syzkaller.appspot.com/x/.config?x=cea91ee10b0cd274 dashboard link: https://syzkaller.appspot.com/bug?extid=78b76ebc91042904f34e syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10cf03e2b00000 Reported-by: syzbot+78b76ebc91042904f34e@syzkaller.appspotmail.com Fixes: 34ced75ca1f6 ("io_uring: reduce frequent add_wait_queue() overhead for multi-shot poll request") For information about bisection process see: https://goo.gl/tpsmEJ#bisection