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=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 EBDE8C433B4 for ; Sun, 2 May 2021 15:56:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CD3486120E for ; Sun, 2 May 2021 15:56:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232415AbhEBP5a (ORCPT ); Sun, 2 May 2021 11:57:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37500 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232392AbhEBP53 (ORCPT ); Sun, 2 May 2021 11:57:29 -0400 Received: from mail-wm1-x32c.google.com (mail-wm1-x32c.google.com [IPv6:2a00:1450:4864:20::32c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 75237C06174A; Sun, 2 May 2021 08:56:37 -0700 (PDT) Received: by mail-wm1-x32c.google.com with SMTP id g65so1902183wmg.2; Sun, 02 May 2021 08:56:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=iE0/1+DQAvjT7mxedPOLj9B11v3SoDtPVESyVolZSTM=; b=G3/iYb6NJJ/JXrFJYLkjgnsFEaVcS/vu10zurP0bOQtWqwZkK+hN5JyTD/p+nw8uSZ /LoDZrFP5z+Cxh1XtzB43BEPi0CEFSzQKpxSZrfLLbUxOKJZ9fJDMGejQ2lRaMdRK5e/ CATosKQR76z4Z57n3zItIhaeKrCkCk9qPgMRp6/ugSOAnTrznotP/6CXvqDUP9Nx7zbT cXjVYI43WgMqp3/L87gxu8Q8x2AjMQnIFlNx7RHO0a/0TtqcMygqYBwQHOpV7G3Rds98 GjPy8madettgexgiPCwRbxPvlz6Ae3PzffHtMxDtbiVjhLvsEEoSAxGWR0Wzx0YFLTOV 1cwA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=iE0/1+DQAvjT7mxedPOLj9B11v3SoDtPVESyVolZSTM=; b=OdExbTOikzWKuHmD6nS0a31VD3wsZYXJBF2zLe52MBUnQ18bwi1GHrlyK7uIB4aBIK V9yeY4y3DZoRBhFhJiFuCQ/Az4RTaUbQQ2eYfgREnzP6twxTNKtqCuIX5nZ+HQyqV/hf OQ4gXikee5+WhHaISmIdDpljJvMK9mViA4YVJRu4FfZVR7hkxH+i4S8ZP9AiGsiu7Yrj 8bLR7fiNTf1wPQVslHU+Kl3vz7aeEntS3IkU7w3JR5dtw0xsaD6gJV79b3lnYlpm/PGi AAf98e+g+QnzfwymSND7FmfBkUEO+QlLlBYq9jGdoDDEIlT2Lr0qKTgoKEBNMCPOBjIW xT/Q== X-Gm-Message-State: AOAM5301pmfXI2hUa7oWdDLAxxN6Lvfw+tgwnbRL+AOw/QpMutSapQnX s/XrVcxwliewUd5j9OLG+LI= X-Google-Smtp-Source: ABdhPJwVAc9Oli13vnWIUUcEZz5cucZedc3rCenFGPZUTO7GOr8Tu8Pl/RG4ERd68Ia+vsGJGMV+rQ== X-Received: by 2002:a05:600c:322a:: with SMTP id r42mr6065428wmp.98.1619970996227; Sun, 02 May 2021 08:56:36 -0700 (PDT) Received: from [192.168.8.197] ([185.69.145.156]) by smtp.gmail.com with ESMTPSA id 6sm22916152wmg.9.2021.05.02.08.56.35 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 02 May 2021 08:56:35 -0700 (PDT) Subject: Re: INFO: task hung in io_uring_cancel_sqpoll To: Palash Oswal , Hillf Danton 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> <12e84e19-a803-25e3-7d15-d105b56d15b6@gmail.com> From: Pavel Begunkov Message-ID: <35f8d506-fb3b-94a5-8aab-f1bde0e5f48a@gmail.com> Date: Sun, 2 May 2021 16:56:31 +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: linux-kernel@vger.kernel.org On 5/2/21 4:01 PM, Palash Oswal wrote: > On Sun, May 2, 2021 at 4:04 PM Pavel Begunkov wrote: > >>> 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. > > Hi Pavel and Hillf, > > I believe there's a little misunderstanding, apologies. The reproducer > does not trigger the bug on the for-next tree which has patches for > 5.13. The reproducer process exits correctly. Likely one of those > commits that will be back-ported to 5.12 will address this issue. > When I wrote `the reproducer fails`, I meant to indicate that the bug > is not triggered on for-next. I will word it better next time! I see, great it's clarified -- Pavel Begunkov