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=-4.3 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,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 E449EC48BE5 for ; Tue, 15 Jun 2021 13:49:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C7CB161474 for ; Tue, 15 Jun 2021 13:49:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230079AbhFONvb (ORCPT ); Tue, 15 Jun 2021 09:51:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59454 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230076AbhFONva (ORCPT ); Tue, 15 Jun 2021 09:51:30 -0400 Received: from mail-ed1-x52c.google.com (mail-ed1-x52c.google.com [IPv6:2a00:1450:4864:20::52c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A70D2C061574 for ; Tue, 15 Jun 2021 06:49:24 -0700 (PDT) Received: by mail-ed1-x52c.google.com with SMTP id ba2so49449302edb.2 for ; Tue, 15 Jun 2021 06:49:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:from:to:cc:references:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=u61IP45ErRHu1XSm4XpPBMQxQAMbY5rT3i06pp9fyeM=; b=c57CF2DXgG6c/5WZ8LFWaIEsswo3g4PhhJeqwwbnoL5eGlJ1y4GhVZaYZAajrkLcOz XE3bLRVdvnLiFnRE4Gow7jDo4RdcLsdnu6bkEXXHJ5rouzkCQKxiAMnNPwA4oNrO+Vea 3GdBI/VBWh5oo/ZNDi2cHjjDH8IOj5HZy2mfixIEV+6J0Uw1M1DFwQbQs8WYKHSKdZgn kl6+HowJMKldD8ZzCE8cg9/tjZdeqtUyykBaNimczS0ohs13zAjHy8D8ULcJDrFUprS+ L75MnIuHgOEXvNxOyOUAZGXBeFxNF6+ZYPQ3/hYmNrodZxx4fod9qmFyMUFHJorlUyNE 5W2Q== 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:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=u61IP45ErRHu1XSm4XpPBMQxQAMbY5rT3i06pp9fyeM=; b=HWBOIF1kY6BMJk0/1UqqSJEDQHn05Afqu2wmbCYdKDQcookhgCetactqtIN2dMmEVO IszhmKOdTkK4UHr+tNBpi4zC56HPKc6vlCmC5Du9PB4y2z6hhzasoInxkp2ao8XvHf8a YH89YPK2fNH1ENDLw8bz52l/TbeBcPpX8aT1G6lKMXHXoQaJmpfqiVycfsPAAfWP0OlS RoLtzb8wPlEisEjMcRHIMzFcXwXgNaCWLNcH5a/Q9fnI7SXH5pcOHfqKOfOz/d3HYZgJ j6LgpBjlCEQChR0QjELRio4kA30h/5Tmg0QKpP8zCEk0DUwXl2tOxa/DixWLuW4/9quh meGw== X-Gm-Message-State: AOAM530QFAOEwWMVvHULKd/joLEX7+TA6OhTRCzee7QnB5aReV/TVLtx CEWHjRiBcICt2cHqYeELJvyKl6LfNegxSg== X-Google-Smtp-Source: ABdhPJw0O6ZLQGHj+qoSNkpROw0Uxgp/7GivRJT76/JCgM1aOODt73XHMixwFkKgDrdPso8epFq94Q== X-Received: by 2002:aa7:da4b:: with SMTP id w11mr23943872eds.272.1623764963134; Tue, 15 Jun 2021 06:49:23 -0700 (PDT) Received: from [10.41.230.130] ([209.206.26.76]) by smtp.gmail.com with ESMTPSA id d25sm9052583edu.83.2021.06.15.06.49.22 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 15 Jun 2021 06:49:22 -0700 (PDT) Subject: Re: Hung task in 4.9 using kvm 5.2 From: Christoph Mathys To: Luis Goncalves , "Ahmed S. Darwish" Cc: Linux RT Users References: <0d6485d8-62d2-0e28-fb30-b52883dc0ecf@gmail.com> Message-ID: Date: Tue, 15 Jun 2021 15:49:22 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: <0d6485d8-62d2-0e28-fb30-b52883dc0ecf@gmail.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-rt-users@vger.kernel.org I'm unable to reproduce "BUG: unable to handle kernel paging request" when I use 4.9.178-rt131, so I'm inclined to think that it got introduced somewhere along the way to 4.9.271-rt182. The problem with "hung task" is also gone when I don't force qemu 5.2 to use cache.direct=true and aio=native. Qemu 2.1 from Debian Jessie does not trigger this problem on the same system. Christoph