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=-5.3 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 C127CC433E7 for ; Sat, 17 Oct 2020 15:03:04 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 009C220708 for ; Sat, 17 Oct 2020 15:03:03 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=kernel-dk.20150623.gappssmtp.com header.i=@kernel-dk.20150623.gappssmtp.com header.b="l3DQGcmC" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 009C220708 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.dk Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:50796 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kTnja-0001pe-Ud for qemu-devel@archiver.kernel.org; Sat, 17 Oct 2020 11:03:02 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:45328) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kTnip-0000o7-5k for qemu-devel@nongnu.org; Sat, 17 Oct 2020 11:02:15 -0400 Received: from mail-pg1-x52e.google.com ([2607:f8b0:4864:20::52e]:45145) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1kTnim-0001tW-UD for qemu-devel@nongnu.org; Sat, 17 Oct 2020 11:02:14 -0400 Received: by mail-pg1-x52e.google.com with SMTP id y14so3210916pgf.12 for ; Sat, 17 Oct 2020 08:02:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20150623.gappssmtp.com; s=20150623; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=3Av728nHUNWDB99Z9R2oPXgfeSaWAqr1kGKqCSrROkg=; b=l3DQGcmChwuutZXYo7hRJRTj652AaI25WSApAF4SR9zbf6NzjCsieQPaXMG3STe/ZL yhFv6RGW+omQOGF+/cXP6FAK/ZTu6097t6tcaAeGBCmo9MW3FLArj7kILhrq1LJtAQ4D UzCHwyN6mqig60fNBaygRFX9M9pQToLNuNAvwMiDAvfGQO6r8N0ToNGY80VUNzFeVrgJ rFKuU3GeYaccI+q99RGb1cmXmHhsIG7c3uj8wRodTA4hGX9fuUosx+cBCB4yo7kMZZ+C YSf2RONP6BAZoYnCvuhCRhpOn88jD1AQDYGsxPPFdwBmM5Tm1LgCwvmQ+FavlbLBHZM8 YcsQ== 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=3Av728nHUNWDB99Z9R2oPXgfeSaWAqr1kGKqCSrROkg=; b=U3MGq9og7h+fao5xY/Ww8fUrbM04Js+0150h4d1pTLAnOGjA3Y/2SqHEgRDjeVFr+9 UuFND8v64UKsguyXtUT508m/e0zdc0mRMOhQqdaVVEgBXiRwK2f66JO1oJ/0II97dVr8 ZVYaCCvNIAf5U53Q2D4kIsT+Bt80xd83WmbJr+7t+kQtUkkE7Ux1luCzI4zb39BZSbzv FqIhofRKiTadyzk8uFfm16M/anQD3U8rB6jNpxnuiC0IxLcM0eElFgzAuaK3GyMXTMjI YrVtvs17pK6q4usNmjV3QPEz5Z+DtzNHeThMZ86UZLd0gl6L8ru7sz4J0YaAfG0gWBeF QGnQ== X-Gm-Message-State: AOAM531IpAUWFhg9JzgGL/2Cmf6dqJVFX47hsaelfI8qa35NHLw/bcH8 1JGipqrH/Nm7xsw+K0o32JfNWz+fSS1mZh0h X-Google-Smtp-Source: ABdhPJyB6FbdNCnvkLijCDVBbwjGC+a0NwA6qlBeytGY5+f2CyXS0uMfYrWKL12OwEg86LRKbnJLyA== X-Received: by 2002:a63:380d:: with SMTP id f13mr7612106pga.105.1602946930766; Sat, 17 Oct 2020 08:02:10 -0700 (PDT) Received: from [192.168.1.134] ([66.219.217.173]) by smtp.gmail.com with ESMTPSA id y80sm6298017pfb.144.2020.10.17.08.02.09 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 17 Oct 2020 08:02:10 -0700 (PDT) Subject: Re: io_uring possibly the culprit for qemu hang (linux-5.4.y) To: Ju Hyung Park References: <20201001085900.ms5ix2zyoid7v3ra@steredhat> <20201002073457.jzkmefo5c65zlka7@steredhat> <05afcc49-5076-1368-3cc7-99abcf44847a@kernel.dk> From: Jens Axboe Message-ID: <7ea53adb-14c7-8c31-2f9e-44a3847ee91c@kernel.dk> Date: Sat, 17 Oct 2020 09:02:09 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=2607:f8b0:4864:20::52e; envelope-from=axboe@kernel.dk; helo=mail-pg1-x52e.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, NICE_REPLY_A=-0.247, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-devel@nongnu.org, io-uring@vger.kernel.org, Stefano Garzarella Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 10/17/20 8:29 AM, Ju Hyung Park wrote: > Hi Jens. > > On Sat, Oct 17, 2020 at 3:07 AM Jens Axboe wrote: >> >> Would be great if you could try 5.4.71 and see if that helps for your >> issue. >> > > Oh wow, yeah it did fix the issue. > > I'm able to reliably turn off and start the VM multiple times in a row. > Double checked by confirming QEMU is dynamically linked to liburing.so.1. > > Looks like those 4 io_uring fixes helped. Awesome, thanks for testing! -- Jens Axboe