Received: by 2002:ab2:6991:0:b0:1f7:f6c3:9cb1 with SMTP id v17csp469629lqo; Wed, 8 May 2024 05:42:52 -0700 (PDT) X-Forwarded-Encrypted: i=3; AJvYcCWJ49QiQANtZG/f7ezmK4C1ZpDJwNMMgSJL3PHHh0NqN5gkVKQG5ghIw0YqwkWk3NddhJyq5ry4ZQFEnKnwLQwsNKaM9Gg11fayIvGqww== X-Google-Smtp-Source: AGHT+IEtHY1w7naLL9tZPl6cqwDXqGZ5D+w/rX4oI2EO2AQO+gdyjyWf7jyzRoHGITfuC0uG4Ewe X-Received: by 2002:a05:6871:29a:b0:23d:9f6b:5d41 with SMTP id 586e51a60fabf-24096d29e30mr2876774fac.0.1715172171950; Wed, 08 May 2024 05:42:51 -0700 (PDT) ARC-Seal: i=2; a=rsa-sha256; t=1715172171; cv=pass; d=google.com; s=arc-20160816; b=Y0lLlgVi0A1I7SmA9mNSxGTZfBQBImx+eruunRyQxXQKxwMVyr0IGaq1fCRdeSS4L3 05Tuw5wgI7k95hYX2NsIrryFzPTwWxoUn5ABwZdE7Y+6DbLbEOnq97ihzDYOn9tFgXMW fyygTL7Qe4MCkuL3jEp7WLLb3APpQd8q2aXpdveAZ1h70jdspRR12qnlj5BsA/MFyXrF sc2e/XCiecDqJzXzcekvEi+2LF3VV9U9fkpTPb6WKzP4uLC6fviW0qdFqsTy0Ga9eer1 jSXvsMZ1CpbynMxIWl2/jPB9ShXe0NIMF5Sh+IwNgaxqp9/blpvNVKNHE378VwuIhpbR Y40w== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:list-unsubscribe :list-subscribe:list-id:precedence:date:message-id:dkim-signature; bh=ApysZcF/hqgTR5K+moV5cGuzcGBPRqn9VmuyeK0mucs=; fh=ekN/Ayqo1odIXCyi2BnEaav1VyuiGi8q9xyQ45MZrCs=; b=hm4TKrtZZu8RL6u2HTVvTDWvei5UWLPFQd2stPw/tyW8HjbtpHwhYhDkBmlgkiu2/q NWNNlsADP6JXIb+HjKvWregse1D12YIHbTXaYVuyF6wf0JGJr15XTQWEx7xn/sjLURaA UklQGuEh/dKg7xfWpYcaCBS7s2N3byHfOE+5YWUnVi/ZHbLHKtR7UAbHeINWQEw3TqlG DI6b5ZcYlI/7pd5KC7Zh0UQ4aeK7YYUnK0DsQBphKt+gel9z4C/9f56hWxQaNcsKfroB CBcZWgdcRacPD0O6yyV3y6unYJZrU3lh/bwU2qH/EJbjB4lZJXQO5Xv31N4vdgrekQTw nzfw==; dara=google.com ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@gmail.com header.s=20230601 header.b=h4GFvdIF; arc=pass (i=1 spf=pass spfdomain=gmail.com dkim=pass dkdomain=gmail.com dmarc=pass fromdomain=gmail.com); spf=pass (google.com: domain of linux-kernel+bounces-173235-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45e3:2400::1 as permitted sender) smtp.mailfrom="linux-kernel+bounces-173235-linux.lists.archive=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Return-Path: Received: from sv.mirrors.kernel.org (sv.mirrors.kernel.org. [2604:1380:45e3:2400::1]) by mx.google.com with ESMTPS id bx18-20020a056a02051200b0060ab18e7cfbsi13321483pgb.28.2024.05.08.05.42.51 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 08 May 2024 05:42:51 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel+bounces-173235-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45e3:2400::1 as permitted sender) client-ip=2604:1380:45e3:2400::1; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20230601 header.b=h4GFvdIF; arc=pass (i=1 spf=pass spfdomain=gmail.com dkim=pass dkdomain=gmail.com dmarc=pass fromdomain=gmail.com); spf=pass (google.com: domain of linux-kernel+bounces-173235-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45e3:2400::1 as permitted sender) smtp.mailfrom="linux-kernel+bounces-173235-linux.lists.archive=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sv.mirrors.kernel.org (Postfix) with ESMTPS id 4541C2837BF for ; Wed, 8 May 2024 12:42:51 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 2003B54BE2; Wed, 8 May 2024 12:42:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="h4GFvdIF" Received: from mail-lj1-f182.google.com (mail-lj1-f182.google.com [209.85.208.182]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CDD515102F for ; Wed, 8 May 2024 12:42:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.208.182 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715172165; cv=none; b=OZNuxOyIqs2BxQ5ymWXS+JIrgvMdwdSKImwuXuaNle+WMenbaXSiNobNoLjlE3oxmTwkMO7dg1ilGPABn7nxHlFx3B4FNdGbbNPyrngo927pnWOpLNumXrlu5ClFMs02TzfN9HaFJM2ZD7bJgv0fcCVKVc5oGMUoYe9oQmVCGBw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715172165; c=relaxed/simple; bh=feq48cNug3s+tLhKQSxR/rgeiYdCnZck9qxHjzZMtAw=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=FsB9BpTTDjgK8QQhNQ2owrj7/lwQakspddi20aHBuXd3GAcy7kjI6Bt6KrXZjUqSVcTYrMKm8uaLXCZACFOfC4Uw0Vg7xKWGeyZOw1EHvDE10pj+pRma2W//FTbJl78mpsMBoMdoIM/HknM58A/98phtqFrcl2vYNBrZQHz20Xk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=h4GFvdIF; arc=none smtp.client-ip=209.85.208.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Received: by mail-lj1-f182.google.com with SMTP id 38308e7fff4ca-2e3fa13f018so21409141fa.3 for ; Wed, 08 May 2024 05:42:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1715172162; x=1715776962; darn=vger.kernel.org; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=ApysZcF/hqgTR5K+moV5cGuzcGBPRqn9VmuyeK0mucs=; b=h4GFvdIFvCuOV93PRVSg06z+HxbuPDnbi+/LKyjCgI0ZY6k9SJabkXv4+dwuZQOLI/ Vjt+75M8JoGU9Rv4tqS1GKKCk5dSToaJIfu4suc4fNt8YXfk6ejH7EQZGoRr3kYUh4aw xrKrVgOmAci3X3jJdQwd77QHaAewIARgW4A+MqwiJx1mTAROAYXElfrwvm/j2te1N81W 0SyJ5FRNEkZkKds5KUHRiBWmDokCKtbFOTT4AAZDQXQfcMuNA9isga9us6kbwCc7ockQ Sa44/RwJHD1j6DJbeI0BZtw3yE/wQiwE0B956Z1EgHvMvoJG+b68czuhoI6bO3StdcpF lztg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1715172162; x=1715776962; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=ApysZcF/hqgTR5K+moV5cGuzcGBPRqn9VmuyeK0mucs=; b=dQ02h0monJpgbT11aeIQbwjhbN6Hr8Kf5PW7X1GBn6CM5qmXTOGE/0WB2hEiAEZcGn 6jtOj0IS3fuwyIrYGCi4Txv9kyredKHx7DI5Ij6qibkhJS3YjqN2jCDHUgKlP0DB3Vpp IQlr1gnMyoUKnsvMuLLIU8IoxxVWDU4Zx+9dkHHw8NoSHedh6qxZM8kQoInoy1qkYVfF Q2i3BXrxPtWDYauE5/oIR2ecqj9cDuaKt1/IHDkr95J1k71ngbuW5oyUaCZG9/ElgrnI 1q/eq2rUq4C1SwoHlUyTQ2S/xn7GRWNF5zr4z2AAHLjirwhBHcN6p2vYwrm4fdpPMms/ K+2w== X-Forwarded-Encrypted: i=1; AJvYcCWWVf5m0+jYg/Z2msXMWmOAuXeET9gQtdSFx1wC/EpywSazJjoc6XBpaRXgK7vzh56IGuQmHrNc/WFk5YZN3+uz+nJi/dKbGs51F1Rn X-Gm-Message-State: AOJu0YzSX94UdWzDllx5a0bRddYKyMOzldlD8IIIxNk1s9l7HB/qdZjE xPGKcTLHjjEZV/9b/Ilf3/uWI+0WtR+onHAtRLab820AsWY5SHQG X-Received: by 2002:a2e:b88b:0:b0:2df:e2d1:f4b5 with SMTP id 38308e7fff4ca-2e446d8a24cmr20751091fa.21.1715172161637; Wed, 08 May 2024 05:42:41 -0700 (PDT) Received: from [130.235.83.196] (nieman.control.lth.se. [130.235.83.196]) by smtp.gmail.com with ESMTPSA id x23-20020a05651c105700b002dffa4aef20sm2402065ljm.2.2024.05.08.05.42.40 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 08 May 2024 05:42:41 -0700 (PDT) Message-ID: Date: Wed, 8 May 2024 14:42:38 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [BUG][v6.9-rc6] Deadlock with: Revert "drm/qxl: simplify qxl_fence_wait" To: Steven Rostedt , David Airlie Cc: Linus Torvalds , Maxime Ripard , LKML , Alex Constantino , Timo Lindfors , Gerd Hoffmann , Maarten Lankhorst , Thomas Zimmermann , Daniel Vetter References: <20240502081641.457aa25f@gandalf.local.home> <20240504043957.417aa98c@rorschach.local.home> <20240506-cuddly-elated-agouti-be981d@houat> <20240507050354.66bd88a0@rorschach.local.home> Content-Language: en-US From: Anders Blomdell In-Reply-To: <20240507050354.66bd88a0@rorschach.local.home> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 2024-05-07 11:03, Steven Rostedt wrote: > On Tue, 7 May 2024 15:54:21 +1000 > David Airlie wrote: > >> I expec this will reintroduce the other problems that caused this >> change in the first place, but I think this should at least bring us >> back to regression equilibrium. I can't recommend anyone use qxl hw >> over virtio-gpu hw in their VMs, since virtio-gpu is actually hw >> designed for virt. > > I agree that it will likely cause the issues that this was addressing > to come back, but you can't have a fix that introduces a deadlock. > > Perhaps the deadlock didn't exist before, and the printk updates > changed the way it works to introduce it now? It deadlocks on 6.8.8 under qemu/kvm, reverting the patch fixes the problem there as well (6.8.7 hangs as well, but I have not tested reverting on that version) /Anders