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,INCLUDES_PATCH,MAILING_LIST_MULTI,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 08D1CC433ED for ; Fri, 16 Apr 2021 00:30:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C6D856113D for ; Fri, 16 Apr 2021 00:30:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236812AbhDPAah (ORCPT ); Thu, 15 Apr 2021 20:30:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56884 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236724AbhDPAah (ORCPT ); Thu, 15 Apr 2021 20:30:37 -0400 Received: from mail-wr1-x430.google.com (mail-wr1-x430.google.com [IPv6:2a00:1450:4864:20::430]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C3FFCC061574 for ; Thu, 15 Apr 2021 17:30:12 -0700 (PDT) Received: by mail-wr1-x430.google.com with SMTP id e7so16020147wrs.11 for ; Thu, 15 Apr 2021 17:30:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:from:to:cc:references:autocrypt:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=WvruIPZmP+EA0BiOil2r1pzs/0wet5zroptT7FMTHoU=; b=Z+BAi1j5b8RI67Tf8eAh/3epujE03Jm7bvlum4ZQUcJGYNzwVbNUA0TmEKDgiA4Ex2 Om9UwmKCiZMr5F252KnRb+yeaNsA5djlnfjFMFwUat1DwbOtRESGkW9esGLTjQim6Gj/ luj7QEKSOsXJxOyX9jfgYiRC24Q7SCbYayhHb1sNFeb2uRaV89y2aHwi+xBAu+m4VZQO Np3oO5VmHaDKyCp//ItF8HT3jtKxb+pbuci7VtRz8bvK37lWU9S+geXcPrkyi3kgS7GB x+ghMJuYZGB0FohFmzuIY2KbfRQL+5qob32fEZkdd2/5NWHSLjuW9PihfUQc6qxmf6pM SrDQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:from:to:cc:references:autocrypt :message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=WvruIPZmP+EA0BiOil2r1pzs/0wet5zroptT7FMTHoU=; b=ONxHElPyPRDjVK3kY7H6IuWSN/1eP+bgr7ueQ94o2QzX/4MkcD+/lDE0MNg/GK19rI vpJk33qhRitwUlZJq9i/qosYc750Omq08I8Dd7lGBtyvIAdgPgSqTFERKG1PXN7qmY5u uiETNuXvkkvUYyiZicJhjJn0dMv1q13nG3W26sJR5UoFyqBxD0nqFWvVLkAROVqwsslf 0Vpk/2xoJHp4RxsHttbkaR9ZfdhKV7v5UmUl6WhEEqZzDUlrlZ7JDFI+Ugip+D/mzhmd WhNlKBt0VkiEb+Rk7ezF88rfbTS8vSTBhau8f5hVsn1h6g8xw/Ei/7JGAOVdfJpRvwMm FBQQ== X-Gm-Message-State: AOAM530CBEa+Q7ClbHqN2hxFBuL7TImycLN9vFhH8ymvGJQozTL/k9da pg4o/dz1F1muhe406I7KZs8= X-Google-Smtp-Source: ABdhPJwYeds+/hh//Yh8Hdgm7VL/RFKzd65RQh8Ik0RLat8FQkZd8Y/bYSyEHD3XId5iKNoady9b3A== X-Received: by 2002:a5d:6605:: with SMTP id n5mr6004360wru.116.1618533011639; Thu, 15 Apr 2021 17:30:11 -0700 (PDT) Received: from [192.168.8.191] ([185.69.144.21]) by smtp.gmail.com with ESMTPSA id u8sm6489898wrp.66.2021.04.15.17.30.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 15 Apr 2021 17:30:11 -0700 (PDT) Subject: Re: [PATCH 0/2] fix hangs with shared sqpoll From: Pavel Begunkov To: Jens Axboe , io-uring@vger.kernel.org Cc: Dennis Zhou , Tejun Heo , Christoph Lameter , Joakim Hassila References: Autocrypt: addr=asml.silence@gmail.com; prefer-encrypt=mutual; keydata= mQINBFmKBOQBEAC76ZFxLAKpDw0bKQ8CEiYJRGn8MHTUhURL02/7n1t0HkKQx2K1fCXClbps bdwSHrhOWdW61pmfMbDYbTj6ZvGRvhoLWfGkzujB2wjNcbNTXIoOzJEGISHaPf6E2IQx1ik9 6uqVkK1OMb7qRvKH0i7HYP4WJzYbEWVyLiAxUj611mC9tgd73oqZ2pLYzGTqF2j6a/obaqha +hXuWTvpDQXqcOZJXIW43atprH03G1tQs7VwR21Q1eq6Yvy2ESLdc38EqCszBfQRMmKy+cfp W3U9Mb1w0L680pXrONcnlDBCN7/sghGeMHjGKfNANjPc+0hzz3rApPxpoE7HC1uRiwC4et83 CKnncH1l7zgeBT9Oa3qEiBlaa1ZCBqrA4dY+z5fWJYjMpwI1SNp37RtF8fKXbKQg+JuUjAa9 Y6oXeyEvDHMyJYMcinl6xCqCBAXPHnHmawkMMgjr3BBRzODmMr+CPVvnYe7BFYfoajzqzq+h EyXSl3aBf0IDPTqSUrhbmjj5OEOYgRW5p+mdYtY1cXeK8copmd+fd/eTkghok5li58AojCba jRjp7zVOLOjDlpxxiKhuFmpV4yWNh5JJaTbwCRSd04sCcDNlJj+TehTr+o1QiORzc2t+N5iJ NbILft19Izdn8U39T5oWiynqa1qCLgbuFtnYx1HlUq/HvAm+kwARAQABtDFQYXZlbCBCZWd1 bmtvdiAoc2lsZW5jZSkgPGFzbWwuc2lsZW5jZUBnbWFpbC5jb20+iQJOBBMBCAA4FiEE+6Ju PTjTbx479o3OWt5b1Glr+6UFAlmKBOQCGwMFCwkIBwIGFQgJCgsCBBYCAwECHgECF4AACgkQ Wt5b1Glr+6WxZA//QueaKHzgdnOikJ7NA/Vq8FmhRlwgtP0+E+w93kL+ZGLzS/cUCIjn2f4Q Mcutj2Neg0CcYPX3b2nJiKr5Vn0rjJ/suiaOa1h1KzyNTOmxnsqE5fmxOf6C6x+NKE18I5Jy xzLQoktbdDVA7JfB1itt6iWSNoOTVcvFyvfe5ggy6FSCcP+m1RlR58XxVLH+qlAvxxOeEr/e aQfUzrs7gqdSd9zQGEZo0jtuBiB7k98t9y0oC9Jz0PJdvaj1NZUgtXG9pEtww3LdeXP/TkFl HBSxVflzeoFaj4UAuy8+uve7ya/ECNCc8kk0VYaEjoVrzJcYdKP583iRhOLlZA6HEmn/+Gh9 4orG67HNiJlbFiW3whxGizWsrtFNLsSP1YrEReYk9j1SoUHHzsu+ZtNfKuHIhK0sU07G1OPN 2rDLlzUWR9Jc22INAkhVHOogOcc5ajMGhgWcBJMLCoi219HlX69LIDu3Y34uIg9QPZIC2jwr 24W0kxmK6avJr7+n4o8m6sOJvhlumSp5TSNhRiKvAHB1I2JB8Q1yZCIPzx+w1ALxuoWiCdwV M/azguU42R17IuBzK0S3hPjXpEi2sK/k4pEPnHVUv9Cu09HCNnd6BRfFGjo8M9kZvw360gC1 reeMdqGjwQ68o9x0R7NBRrtUOh48TDLXCANAg97wjPoy37dQE7e5Ag0EWYoE5AEQAMWS+aBV IJtCjwtfCOV98NamFpDEjBMrCAfLm7wZlmXy5I6o7nzzCxEw06P2rhzp1hIqkaab1kHySU7g dkpjmQ7Jjlrf6KdMP87mC/Hx4+zgVCkTQCKkIxNE76Ff3O9uTvkWCspSh9J0qPYyCaVta2D1 Sq5HZ8WFcap71iVO1f2/FEHKJNz/YTSOS/W7dxJdXl2eoj3gYX2UZNfoaVv8OXKaWslZlgqN jSg9wsTv1K73AnQKt4fFhscN9YFxhtgD/SQuOldE5Ws4UlJoaFX/yCoJL3ky2kC0WFngzwRF Yo6u/KON/o28yyP+alYRMBrN0Dm60FuVSIFafSqXoJTIjSZ6olbEoT0u17Rag8BxnxryMrgR dkccq272MaSS0eOC9K2rtvxzddohRFPcy/8bkX+t2iukTDz75KSTKO+chce62Xxdg62dpkZX xK+HeDCZ7gRNZvAbDETr6XI63hPKi891GeZqvqQVYR8e+V2725w+H1iv3THiB1tx4L2bXZDI DtMKQ5D2RvCHNdPNcZeldEoJwKoA60yg6tuUquvsLvfCwtrmVI2rL2djYxRfGNmFMrUDN1Xq F3xozA91q3iZd9OYi9G+M/OA01husBdcIzj1hu0aL+MGg4Gqk6XwjoSxVd4YT41kTU7Kk+/I 5/Nf+i88ULt6HanBYcY/+Daeo/XFABEBAAGJAjYEGAEIACAWIQT7om49ONNvHjv2jc5a3lvU aWv7pQUCWYoE5AIbDAAKCRBa3lvUaWv7pfmcEACKTRQ28b1y5ztKuLdLr79+T+LwZKHjX++P 4wKjEOECCcB6KCv3hP+J2GCXDOPZvdg/ZYZafqP68Yy8AZqkfa4qPYHmIdpODtRzZSL48kM8 LRzV8Rl7J3ItvzdBRxf4T/Zseu5U6ELiQdCUkPGsJcPIJkgPjO2ROG/ZtYa9DvnShNWPlp+R uPwPccEQPWO/NP4fJl2zwC6byjljZhW5kxYswGMLBwb5cDUZAisIukyAa8Xshdan6C2RZcNs rB3L7vsg/R8UCehxOH0C+NypG2GqjVejNZsc7bgV49EOVltS+GmGyY+moIzxsuLmT93rqyII 5rSbbcTLe6KBYcs24XEoo49Zm9oDA3jYvNpeYD8rDcnNbuZh9kTgBwFN41JHOPv0W2FEEWqe JsCwQdcOQ56rtezdCJUYmRAt3BsfjN3Jn3N6rpodi4Dkdli8HylM5iq4ooeb5VkQ7UZxbCWt UVMKkOCdFhutRmYp0mbv2e87IK4erwNHQRkHUkzbsuym8RVpAZbLzLPIYK/J3RTErL6Z99N2 m3J6pjwSJY/zNwuFPs9zGEnRO4g0BUbwGdbuvDzaq6/3OJLKohr5eLXNU3JkT+3HezydWm3W OPhauth7W0db74Qd49HXK0xe/aPrK+Cp+kU1HRactyNtF8jZQbhMCC8vMGukZtWaAwpjWiiH bA== Message-ID: <8d04fa58-d8d0-8760-a6aa-d2bd6d66d09d@gmail.com> Date: Fri, 16 Apr 2021 01:26:01 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.3.0 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 16/04/2021 01:22, Pavel Begunkov wrote: > Late catched 5.12 bug with nasty hangs. Thanks Jens for a reproducer. 1/2 is basically a rip off of one of old Jens' patches, but can't find it anywhere. If you still have it, especially if it was reviewed/etc., may make sense to go with it instead > > Pavel Begunkov (2): > percpu_ref: add percpu_ref_atomic_count() > io_uring: fix shared sqpoll cancellation hangs > > fs/io_uring.c | 5 +++-- > include/linux/percpu-refcount.h | 1 + > lib/percpu-refcount.c | 26 ++++++++++++++++++++++++++ > 3 files changed, 30 insertions(+), 2 deletions(-) > -- Pavel Begunkov