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=-9.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,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 14978C433B4 for ; Sun, 2 May 2021 10:34:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CE44F613AF for ; Sun, 2 May 2021 10:34:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229789AbhEBKe6 (ORCPT ); Sun, 2 May 2021 06:34:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52662 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229676AbhEBKe6 (ORCPT ); Sun, 2 May 2021 06:34:58 -0400 Received: from mail-wm1-x333.google.com (mail-wm1-x333.google.com [IPv6:2a00:1450:4864:20::333]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D4058C06174A; Sun, 2 May 2021 03:34:06 -0700 (PDT) Received: by mail-wm1-x333.google.com with SMTP id f15-20020a05600c4e8fb029013f5599b8a9so4108163wmq.1; Sun, 02 May 2021 03:34:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:subject:to:cc:references:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=vX3Dh54TACjc7hpqnVwn0ERaoUoL5d3ElTKH1eHs/Dc=; b=VKJ/JT96xR7eU6Rz0lsQ/7osA6Y2Vc5J29ekRhi/CQg0Hgan1VbqKiKazy95OAGXyh fJ4pOesq88yy02CQboO1Nrn84k/ZqxkJGgTaQNKkgHaUB6HS6Z8GbTvg0PNyTVXzOeyk acfnynFT4lInoS9wfwY20YHLpsSiiTLkU0Vo0bpDzIFHtEmSQRpNbNXiK/jXEq1zf/pK Q5Ov5IHM4W6rSvWijmdgRbtM/sH1yJTYiW4edDTWMlt0DU3iYidDp+8St4HB06TuXJsD JiEfa5o8jBqQTECIdPDcbhqQSPIoRJG6JzqQRst7AGEIn9agVVTgsbk8N+ryPFMg93/l YjAQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:subject:to:cc:references:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=vX3Dh54TACjc7hpqnVwn0ERaoUoL5d3ElTKH1eHs/Dc=; b=gjuL2++THz9HI7Y+SpWHQ9Mdr0jNM8yWhBVx8RPsnHWhlh9M41yaiqXZAHryqG3AjP LS7kUyBpKL6yLUkNeI8jot6itjivnSKfljRzI0PDLq9VrZfRo+RnGnh8nEMna1y/61Of xhCLgZiiwbrrxUz9dslqzafEATyiHY03HPce1nY3TaV4VbdYVZojln4yIYvt0p5LDXmN PoiYpgm6BB0UoN//IJZNTLzk0RIwkLzOxsaqUrsP/VPV/seCR9GLXwtTYdS7UWeUCa+r Wf8hBChYJdP3fnMfoY336GNbbWiwh3aAicjLeYb9zeq5VcyLPtyaz/zuXPZ9HaHO5bHo vhnw== X-Gm-Message-State: AOAM5327RwwBRXayxNX8QQsvrQat3o2R5hX9onhFOmFefPYP0nx2fhJt afmndU+HOqyBR2R8TGT4Eyw= X-Google-Smtp-Source: ABdhPJyphmJ5Sr9jTcUgZU5/20y7iif5g3lknxy6ce1sSt3xC4t6VcjeqwgZdYRY2CSGL7otD1ViuA== X-Received: by 2002:a05:600c:4fd0:: with SMTP id o16mr4265974wmq.107.1619951645433; Sun, 02 May 2021 03:34:05 -0700 (PDT) Received: from [192.168.8.197] ([185.69.145.156]) by smtp.gmail.com with ESMTPSA id q12sm8420515wrx.17.2021.05.02.03.34.03 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 02 May 2021 03:34:04 -0700 (PDT) From: Pavel Begunkov Subject: Re: INFO: task hung in io_uring_cancel_sqpoll To: Palash Oswal Cc: Jens Axboe , io-uring@vger.kernel.org, LKML , syzbot+11bf59db879676f59e52@syzkaller.appspotmail.com References: <0000000000000c97e505bdd1d60e@google.com> <53a22ab4-7a2d-4ebd-802d-9d1b4ce4e087n@googlegroups.com> Message-ID: <12e84e19-a803-25e3-7d15-d105b56d15b6@gmail.com> Date: Sun, 2 May 2021 11:33:59 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.0 MIME-Version: 1.0 In-Reply-To: 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 4/30/21 4:02 PM, Palash Oswal wrote: > On Fri, Apr 30, 2021 at 8:03 PM Pavel Begunkov wrote: >> >> On 4/30/21 3:21 PM, Palash Oswal wrote: >>> On Thursday, March 18, 2021 at 9:40:21 PM UTC+5:30 syzbot wrote: >>>> >>>> Hello, >>>> >>>> syzbot found the following issue on: >>>> >>>> HEAD commit: 0d7588ab riscv: process: Fix no prototype for arch_dup_tas.. >>>> git tree: git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git fixes >>>> console output: https://syzkaller.appspot.com/x/log.txt?x=12dde5aed00000 >>>> kernel config: https://syzkaller.appspot.com/x/.config?x=81c0b708b31626cc >>>> dashboard link: https://syzkaller.appspot.com/bug?extid=11bf59db879676f59e52 >>>> userspace arch: riscv64 >>>> CC: [asml.s...@gmail.com ax...@kernel.dk io-u...@vger.kernel.org linux-...@vger.kernel.org] >>>> >>>> Unfortunately, I don't have any reproducer for this issue yet. >> >> There was so many fixes in 5.12 after this revision, including sqpoll >> cancellation related... Can you try something more up-to-date? Like >> released 5.12 or for-next >> > > The reproducer works for 5.12. Tried 5.12, [ 245.467397] INFO: task iou-sqp-2018:2019 blocked for more than 122 seconds. [ 245.467424] Call Trace: [ 245.467432] __schedule+0x365/0x960 [ 245.467444] schedule+0x68/0xe0 [ 245.467450] io_uring_cancel_sqpoll+0xdb/0x110 [ 245.467461] ? wait_woken+0x80/0x80 [ 245.467472] io_sq_thread+0x1c6/0x6c0 [ 245.467482] ? wait_woken+0x80/0x80 [ 245.467491] ? finish_task_switch.isra.0+0xca/0x2e0 [ 245.467497] ? io_wq_submit_work+0x140/0x140 [ 245.467506] ret_from_fork+0x22/0x30 [ 245.467520] INFO: task iou-sqp-2052:2053 blocked for more than 122 seconds. [ 245.467536] Call Trace: [ 245.467539] __schedule+0x365/0x960 [ 245.467545] schedule+0x68/0xe0 [ 245.467550] io_uring_cancel_sqpoll+0xdb/0x110 [ 245.467559] ? wait_woken+0x80/0x80 [ 245.467568] io_sq_thread+0x1c6/0x6c0 [ 245.467577] ? wait_woken+0x80/0x80 [ 245.467586] ? finish_task_switch.isra.0+0xca/0x2e0 [ 245.467591] ? io_wq_submit_work+0x140/0x140 > > I tested against the HEAD b1ef997bec4d5cf251bfb5e47f7b04afa49bcdfe However, there is a bunch patches fixing sqpoll cancellations in 5.13, all are waiting for backporting. and for-next doesn't trigger the issue for me. Are you absolutely sure b1ef997bec4d5cf251bfb5e47f7b04afa49bcdfe does hit it? > commit on for-next tree > https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/?h=for-next > and the reproducer fails. -- Pavel Begunkov