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=-6.8 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,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 811CFC433E6 for ; Tue, 22 Dec 2020 16:37:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 481EA233FA for ; Tue, 22 Dec 2020 16:37:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727716AbgLVQhp (ORCPT ); Tue, 22 Dec 2020 11:37:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59452 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727696AbgLVQho (ORCPT ); Tue, 22 Dec 2020 11:37:44 -0500 Received: from mail-wm1-x336.google.com (mail-wm1-x336.google.com [IPv6:2a00:1450:4864:20::336]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CD6EFC0613D6 for ; Tue, 22 Dec 2020 08:37:03 -0800 (PST) Received: by mail-wm1-x336.google.com with SMTP id 190so2370037wmz.0 for ; Tue, 22 Dec 2020 08:37:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=to:cc:references:from:autocrypt:subject:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=3I5jqFQkorC38cPpYAhnM8U9WSeaLTli3FZdxJpsWmw=; b=MICL13B/MsJ/AnHEbQS5S4m/dwvd5SPp3RcGYbdj0OoQbxOMmGv1w6M+8FyfHM6lt4 bjZhtQm5U18fA81jS1u4enUxhHH42VK22qZjckWqqWaEWW45OEFlVtKZlv3GRC3CHQOG DEJNTeoxKChuvv8r10mQEiEbTfeiUL+p9E+AnCGYYIbtqaRRfgkhAMMSmGybqY1+JWoU 9UseBCo1rjvSZ3zlul33SkgKs7Qffmwl3ehqm8U99uUaWDBMZ8fplbZP418KSED3TJC+ rBrv0yj+mPVMSnbqo0/NIQmqE1cqscKKdJp/k0wPFlvmJtjDheuKb+xUYywKmKpjdy6k o5BQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:to:cc:references:from:autocrypt:subject :message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=3I5jqFQkorC38cPpYAhnM8U9WSeaLTli3FZdxJpsWmw=; b=oBovQWMOOGdfupiBbev2NgVqgURKy1LQ8+P7IGbZo5N3ndKek5BEP9QwjFeKwlOEgA 9I9aJKeMBcA6zKXhs6E4g3Y99TvYI5gdU5q6O4aojV2TnXc/Z4V5PdxUwJlceGCNqiCQ OMHr5/wjiBARvMUGXV5fKEDsqwALVyj9UB0GbbezcQqKixWFCHZlapd+qBLmehzJxyO6 Gbm4MJmbhz0rjc7/o+bR1YpA5p3kejqh/XDIgbAwW+kcyTF9SRMV/PZ4cm2YnEVdz3H1 OHl8f0WT5Bhmja0HlOSHDxxgtN1aBgTt6jRyx7vL8RSKTZj+iVInIj6Ak3MiRevmb/A1 YYfA== X-Gm-Message-State: AOAM530+2SejnGwbsfLOBanokzhLvSPmICOQhTTaU5rahYSOUUehgtA/ 0+xQLf+h6ZoNCatdq4cJFyUOvted22YXLg== X-Google-Smtp-Source: ABdhPJxeNqLWh72qP+RbBFEuYxSXeqSTuFAGXJJHfDbdeeQ+knBwNOHjwP5sAI7H8AEKdc6YGeE/KA== X-Received: by 2002:a1c:7201:: with SMTP id n1mr22311836wmc.139.1608655022153; Tue, 22 Dec 2020 08:37:02 -0800 (PST) Received: from [192.168.8.148] ([185.69.145.156]) by smtp.gmail.com with ESMTPSA id o83sm27524859wme.21.2020.12.22.08.37.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 22 Dec 2020 08:37:01 -0800 (PST) To: Dmitry Kadashev Cc: Jens Axboe , Josef , Norman Maurer , io-uring References: <4dc9c74b-249d-117c-debf-4bb9e0df2988@kernel.dk> <2B352D6C-4CA2-4B09-8751-D7BB8159072D@googlemail.com> <0fe708e2-086b-94a8-def4-e4ebd6e0b709@kernel.dk> <614f8422-3e0e-25b9-4cc2-4f1c07705ab0@kernel.dk> <986c85af-bb77-60d4-8739-49b662554157@gmail.com> <2e968c77-912d-6ae1-7000-5e34eb978ab5@gmail.com> <58bd0583-5135-56a1-23e2-971df835824c@gmail.com> From: Pavel Begunkov 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== Subject: Re: "Cannot allocate memory" on ring creation (not RLIMIT_MEMLOCK) Message-ID: Date: Tue, 22 Dec 2020 16:33:39 +0000 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: 8bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org On 22/12/2020 11:04, Dmitry Kadashev wrote: > On Tue, Dec 22, 2020 at 11:11 AM Pavel Begunkov wrote: [...] >>> What about smaller rings? Can you check io_uring of what SQ size it can allocate? >>> That can be a different program, e.g. modify a bit liburing/test/nop. > Unfortunately I've rebooted the box I've used for tests yesterday, so I can't > try this there. Also I was not able to come up with an isolated reproducer for > this yet. > > The good news is I've found a relatively easy way to provoke this on a test VM > using our software. Our app runs with "admin" user perms (plus some > capabilities), it bumps RLIMIT_MEMLOCK to infinity on start. I've also created > an user called 'ioutest' to run the check for ring sizes using a different user. > > I've modified the test program slightly, to show the number of rings > successfully > created on each iteration and the actual error message (to debug a problem I was > having with it, but I've kept this after that). Here is the output: > > # sudo -u admin bash -c 'ulimit -a' | grep locked > max locked memory (kbytes, -l) 1024 > > # sudo -u ioutest bash -c 'ulimit -a' | grep locked > max locked memory (kbytes, -l) 1024 > > # sudo -u admin ./iou-test1 > Failed after 0 rings with 1024 size: Cannot allocate memory > Failed after 0 rings with 512 size: Cannot allocate memory > Failed after 0 rings with 256 size: Cannot allocate memory > Failed after 0 rings with 128 size: Cannot allocate memory > Failed after 0 rings with 64 size: Cannot allocate memory > Failed after 0 rings with 32 size: Cannot allocate memory > Failed after 0 rings with 16 size: Cannot allocate memory > Failed after 0 rings with 8 size: Cannot allocate memory > Failed after 0 rings with 4 size: Cannot allocate memory > Failed after 0 rings with 2 size: Cannot allocate memory > can't allocate 1 > > # sudo -u ioutest ./iou-test1 > max size 1024 Then we screw that specific user. Interestingly, if it has CAP_IPC_LOCK capability we don't even account locked memory. btw, do you use registered buffers? > > # ps ax | grep wq > 8 ? I< 0:00 [mm_percpu_wq] > 121 ? I< 0:00 [tpm_dev_wq] > 124 ? I< 0:00 [devfreq_wq] > 20593 pts/1 S+ 0:00 grep --color=auto wq > -- Pavel Begunkov