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 671B8C433EF for ; Wed, 3 Nov 2021 23:27:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 51E3161106 for ; Wed, 3 Nov 2021 23:27:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230302AbhKCXaN (ORCPT ); Wed, 3 Nov 2021 19:30:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39616 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230155AbhKCXaK (ORCPT ); Wed, 3 Nov 2021 19:30:10 -0400 Received: from mail-io1-xd34.google.com (mail-io1-xd34.google.com [IPv6:2607:f8b0:4864:20::d34]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 72794C061714 for ; Wed, 3 Nov 2021 16:27:33 -0700 (PDT) Received: by mail-io1-xd34.google.com with SMTP id q203so4720783iod.12 for ; Wed, 03 Nov 2021 16:27:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20210112.gappssmtp.com; s=20210112; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-to:content-language:content-transfer-encoding; bh=9briV7S+xwu2jII1u3WP74CsyaHx/9CSCvTDSgnplDA=; b=e9pD45l8q/YOHP0mAg4QMA2i5/Q2mJSKMY7uFEzZkzmPjvSsV6zFs8gOa9EYCIxdj6 7gHRSEelccv3sy8JyDr8qa/fovYkBeLL46AlpKhXG7/lXricug6a8tYnIUI410fjtHNM TD0Kuy+wz+xc4l97oecMxxUKTjf4HwAa9/oVy51HVW9F4PUarvVOIDJ+UpW9h2FRdw0r QjMeeMdiLp4lu7XAdEbp+ukxblLdO1/+smft+8WjpuRHWXAOdiwjVKFhoUz/AMI2jfWr RZc74GYdt3+1CzE9etbBlsV5K3mi8md60VWRkPUgZPKEqUxucsw7yJsj6FQLMI4hsA3x 4XYg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=9briV7S+xwu2jII1u3WP74CsyaHx/9CSCvTDSgnplDA=; b=XKLDQ2DwUwoNEkFNg2XyoCu6V/gmEyRP2Y3H2GejUoVAF1+ZCZMcJUw9OaXh/cra3I 01tOmRoYkkvfMWParl+ZHwInOwN828F+0IpzW6NCyRQomXTl3SfnobDr+19nvyXOVVcB 6EcU0jCH+vyu/mQjgEPu8XNIXP4X7T6c4SVsfpbtf1gXP6yNDSeIcrs+bNdN4M/gkSyb UQ2+ZHlK6c0CRj4Gh4Um2i0rjSPK+AuNUBAhD8p/zoLdGfXra13CPuz1W2T6SShG7jUR Bv76/EMUUI3lFtm3Vb2BT61o5XMA0SHQtnwaown4bcOi9JYa+v8fpUyfyH89Gv+WrD9k aBOA== X-Gm-Message-State: AOAM533Gu5HeFZSazhSbnurhp0oidS+ltUM/+K7J9pv5XerFIsxpF00a Ozjxwlk2aOzY6JnH/ilPzWA3Lw== X-Google-Smtp-Source: ABdhPJyGoOfpZXPZcdChNFRjiYPgi/i385fBbmhb6Q0lulL3ZyL0ZdhNiI7a8bH+lOTwuWL3oKJPvg== X-Received: by 2002:a5d:954b:: with SMTP id a11mr33350224ios.99.1635982052859; Wed, 03 Nov 2021 16:27:32 -0700 (PDT) Received: from [192.168.1.116] ([66.219.217.159]) by smtp.gmail.com with ESMTPSA id l18sm1682458iob.17.2021.11.03.16.27.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 03 Nov 2021 16:27:32 -0700 (PDT) Subject: Re: [syzbot] WARNING in io_poll_task_func (2) To: syzbot , asml.silence@gmail.com, io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, xiaoguang.wang@linux.alibaba.com References: <0000000000007a0d5705cfea99b2@google.com> From: Jens Axboe Message-ID: <0935df19-f813-8840-fa35-43c5558b90e7@kernel.dk> Date: Wed, 3 Nov 2021 17:27:26 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <0000000000007a0d5705cfea99b2@google.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org On 11/3/21 5:16 PM, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: bdcc9f6a5682 Add linux-next specific files for 20211029 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=14ab0e5cb00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=4b504bcb4c507265 > dashboard link: https://syzkaller.appspot.com/bug?extid=804709f40ea66018e544 > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15710012b00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11862ef4b00000 > > The issue was bisected 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 Again: #syz invalid Please stop testing dead branches, it's pointless and just wastes time. -- Jens Axboe