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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A2F35C433EF for ; Thu, 30 Sep 2021 15:30:49 +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 498AB615A7 for ; Thu, 30 Sep 2021 15:30:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 498AB615A7 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=shadow.tech Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=nongnu.org Received: from localhost ([::1]:37904 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mVy1I-0003Vv-BZ for qemu-devel@archiver.kernel.org; Thu, 30 Sep 2021 11:30:48 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:33860) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mVxmJ-00055J-16 for qemu-devel@nongnu.org; Thu, 30 Sep 2021 11:15:20 -0400 Received: from mail-wr1-x433.google.com ([2a00:1450:4864:20::433]:39753) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1mVxmC-0006I6-PV for qemu-devel@nongnu.org; Thu, 30 Sep 2021 11:15:18 -0400 Received: by mail-wr1-x433.google.com with SMTP id d26so10671035wrb.6 for ; Thu, 30 Sep 2021 08:15:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=shadow-tech.20210112.gappssmtp.com; s=20210112; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:content-transfer-encoding:in-reply-to; bh=3Lorjg4DkfHVI/bKmKwdue4k8cd4ebKAxAry4ybOEJI=; b=vOZdDXxC+fBmktW4Tmg7H9YE4fV0yXk1oGQD7AqVPCCaP31z0FHTcOfD6Mirsf7+2Y ON5NKe+IppsdUeErHZ9Uy4Xh2aeGjt8FAD3IbsnwHFlpedVyi7pW/vwB+sM8dNjAWsOj 4irTnA+95Y24vl23dLY5F/FVj1GLwjSMtsPk+3+lP+Mbv3WGqm8pSOKVg1aIfliTzB7O IH5QJcm2SzLFHFyOO4JVulsrI1bMBCvXSIT5NHD09IUYOTm1o8PqtavtOCQJcCGnygI5 mcVrbsqWNYHDgVVuQF7C6bgCXBQsSg6NJfNsSMa/9WVOUTH9EqgVV6ovhuoHmuv18CrU pwZw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:content-transfer-encoding :in-reply-to; bh=3Lorjg4DkfHVI/bKmKwdue4k8cd4ebKAxAry4ybOEJI=; b=VQX4F3S/6ht1KN9ZoO99bFp/z6iKKCkIePH2prf9L1rxd23N03WxXixhCNJf5kxg5w XYpsrcUZXVA+z4+klROcTybGRQZDYPqz2xIfIXdlvIl2IfgwlI16/Fjw7S+T6b5D9p8C q7sQ06afIU3Ym2Ikb2NfNLBrWW4X+GDhklR518mu6oIDuCiGZEXylfC1b908okfwFQ/+ d48cjXOiVXYN/1MezVH34d297b4cLv89w9e3xK0xol6g8/qAJyM776jrrzkFFAz3E24h ltglSdjzQ9BDzt/GeNgYmk6OiR64B7Rj6qPsPqRqjI9rVnCS1uPOjX40bHAqU78x3Ize QuUw== X-Gm-Message-State: AOAM5302s3edKFnkGs4LXnPLAdVjO7dkA1Jh/NSnndyY37Wz56RPswDU 1vOLhXif9mn7gZ8vWTI3kgTy1Q== X-Google-Smtp-Source: ABdhPJzdWx2j06I6hJLPy3zY4zM8y8Jz39oJXOED8iJViKd0YBEVHDW1IBkXQ+mHfZNSHyXWpvidcA== X-Received: by 2002:a05:6000:2c6:: with SMTP id o6mr7013100wry.292.1633014910305; Thu, 30 Sep 2021 08:15:10 -0700 (PDT) Received: from gmail.com ([2001:41d0:fc88:4700:250:b6ff:fe1f:8e7]) by smtp.gmail.com with ESMTPSA id h18sm3213977wrs.75.2021.09.30.08.15.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Sep 2021 08:15:09 -0700 (PDT) Date: Thu, 30 Sep 2021 17:15:08 +0200 From: Remy Noel To: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= Subject: Re: Strange qemu6 regression cauing disabled usb controller. Message-ID: <20210930151508.mhdkotqv2bcwy6vt@gmail.com> References: <20210930134844.f4kh72vpeknr2vmk@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Received-SPF: permerror client-ip=2a00:1450:4864:20::433; envelope-from=remy.noel@shadow.tech; helo=mail-wr1-x433.google.com X-Spam_score_int: 12 X-Spam_score: 1.2 X-Spam_bar: + X-Spam_report: (1.2 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, FSL_HELO_FAKE=3.096, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no 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: Maxim Levitsky , qemu-devel@nongnu.org, Gerd Hoffmann Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Thu, Sep 30, 2021 at 04:05:52PM +0100, Daniel P. Berrangé wrote: >On Thu, Sep 30, 2021 at 03:48:44PM +0200, Remy Noel wrote: > >Co-incidentally we've just had another bug report filed today that >suggests 7bed89958bfbf40df9ca681cefbdca63abdde39d as a buggy commit >causing deadlock in QEMU > > https://gitlab.com/qemu-project/qemu/-/issues/650 Thanks, although, in this issue, the deadlock seems to be caused by the rcu while in the usb one, it is caused by the iothread unlock (or it may highlight an existing issue) even without rcu waiting.