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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 9F3D2C4321E for ; Thu, 1 Dec 2022 12:53:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Content-Type: Content-Transfer-Encoding:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:In-Reply-To:From:References:Cc:To: Subject:Date:Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=90JliEfvsCylLZXP2/a6lC4186AUbqT8IAnYF6xuQgk=; b=lSR49iqWODxjTUjVmIIU/tnlTZ tY28CU+CePoPvfW7Gea1DOI29EqI04unrybeo/a0mYz7UvRENgLnbDM/wniRQV+g+ziqOJRMOcJwu BxdfW13qE45tLtY0mEuuQpxn5O6fKxa1zf7Rpyhpppf+aQaEQOp8s8k71dOeOMk1xwF1gcEOasjgt GvM3LDMxAmZeLydNV03QmuJSDmCCQ0AAVJRN3ggcYzCPZ4azB3e5Voz7x4UqLYUbtjNBvHKdradLo FcBXj4/4+eiWEDbLiyxIWP7OjXBia4JTMQrxtIUTB1uY8U3ml3OxTPHPFAulVOgLu0SUACtOxTpE+ jVTIaROQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1p0j4Q-007OTP-Sh; Thu, 01 Dec 2022 12:53:42 +0000 Received: from mail-am6eur05on20626.outbound.protection.outlook.com ([2a01:111:f400:7e1b::626] helo=EUR05-AM6-obe.outbound.protection.outlook.com) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1p0iga-007JOM-DZ for kexec@lists.infradead.org; Thu, 01 Dec 2022 12:29:06 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=lMUZOpW+08Pr4puRhRggg9VrJtaXw2+UQxlztPvMJw4esFd6ZnjQJZqtO/J118VALfhxAAiwjtMxq5evUZk6VHGixdJOE40/Qk2uC7gH5CuExCmrcbYL3vP+SUOXkiY7+mWDQ7YnAwPo977PpGqpB6qyrap/psnE2fKk+eWp5Y40rIbk7odz3MrINbmBMwWqQEERpppFrEuKfEfWqGRRwUSTMKfXylH/e8rtJn2L0ImjWv/clP2qmvrXwdWJTyLxsCeu4HSOw760JM4GktV1B5pV2toMmuPGPD5K6If4fzuENn4282JMRaWAy+xdpiEbqC1ODnYWaCkP1WTkUa2Ifg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=kbPn24pTxFwoaROkJViyJRGM1iepzDiLGCKo3Kahd6I=; b=DLZC45v+Md9T0/1zuhu7SidMtxE9cV4UifK8Gk60QTirxWkM5bWuMIyF2reZ44X/O7iVacLAjhZ9LVM90YiwVwiOlc9GVxWfLputafoitNBJMMmWyx3AacmkatLs79El/TtmTx/iP2v0O9XNuFilGMGgdEg8nLkbEkP5vDKsA/H90G6BsgO8ytLgIq1oG5hNz1GYK/3OUe74SXFc8F3CBqqxSFUuvNw2nZaDXmZflCzDZJIqsQ5N2HlFCm5NXdlKfUG7T1j8iu9NeWOVq08JsUsOKpn4IrFaDLqIHgukuLnU+B2z//oNoHA4kHO3myy5mBGi7PpFKx76WA0S26AHlw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=suse.com; dmarc=pass action=none header.from=suse.com; dkim=pass header.d=suse.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=kbPn24pTxFwoaROkJViyJRGM1iepzDiLGCKo3Kahd6I=; b=i5HTMCKQRLoAOCdnQMR+32SxyS9ve6LOjsF3ZUbHCPWLPvgZokA7OuSHlhKgt5tuF/sDjpJN99oScj9QJWVwMab3GTMoIMD8YH4xIxBWKkr1WY8YtSY5Ui2WqFQBL6f44Dy7v8oQTQljVvkT9HVNfuf8SFu7XZkABG3oCutf3Caj5F3Ud/eVxP8aNI+KTh4ZYtAmxt+B3tO/qcIbyuGKKJYUOU8c311VOssEnq8OquLydHLe61Ntk94fB3ZzJa1ypWH9WNPRkOOPPVUPnPi64VluDsxt5NpqLAQdDtgqZJkr0ltT26n5MydSrCSde4l8hpLraT5Pj1wzOhDjNTNFEw== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=suse.com; Received: from VI1PR04MB7104.eurprd04.prod.outlook.com (2603:10a6:800:126::9) by AM9PR04MB8455.eurprd04.prod.outlook.com (2603:10a6:20b:414::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5857.21; Thu, 1 Dec 2022 12:28:56 +0000 Received: from VI1PR04MB7104.eurprd04.prod.outlook.com ([fe80::ae59:a542:9cbc:5b3]) by VI1PR04MB7104.eurprd04.prod.outlook.com ([fe80::ae59:a542:9cbc:5b3%7]) with mapi id 15.20.5857.023; Thu, 1 Dec 2022 12:28:56 +0000 Message-ID: <716e5175-7a44-7ae8-b6bb-10d9807552e6@suse.com> Date: Thu, 1 Dec 2022 13:28:50 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.2.2 Subject: Re: [PATCH v8 3/3] ASoC: SOF: Fix deadlock when shutdown a frozen userspace To: Ricardo Ribalda , Juergen Gross , Mark Brown , Chromeos Kdump , Daniel Baluta , Christophe Leroy , Len Brown , Ard Biesheuvel , Ranjani Sridharan , "Rafael J. Wysocki" , Boris Ostrovsky , Nicholas Piggin , Michael Ellerman , Eric Biederman , Dave Hansen , Jaroslav Kysela , Joel Fernandes , Liam Girdwood , Peter Ujfalusi , Pavel Machek , Pierre-Louis Bossart , Kai Vehmanen , Steven Rostedt , "K. Y. Srinivasan" , Ingo Molnar , Bjorn Helgaas , Dexuan Cui , Takashi Iwai , "H. Peter Anvin" , Bard Liao , Haiyang Zhang , Wei Liu , Thomas Gleixner , Borislav Petkov , x86@kernel.org Cc: kexec@lists.infradead.org, alsa-devel@alsa-project.org, stable@vger.kernel.org, sound-open-firmware@alsa-project.org, linuxppc-dev@lists.ozlabs.org, linux-hyperv@vger.kernel.org, linux-pci@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-efi@vger.kernel.org, xen-devel@lists.xenproject.org References: <20221127-snd-freeze-v8-0-3bc02d09f2ce@chromium.org> <20221127-snd-freeze-v8-3-3bc02d09f2ce@chromium.org> Content-Language: en-US From: Oliver Neukum In-Reply-To: <20221127-snd-freeze-v8-3-3bc02d09f2ce@chromium.org> X-ClientProxiedBy: FR3P281CA0014.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:1d::7) To VI1PR04MB7104.eurprd04.prod.outlook.com (2603:10a6:800:126::9) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: VI1PR04MB7104:EE_|AM9PR04MB8455:EE_ X-MS-Office365-Filtering-Correlation-Id: 29c366d0-5774-4a3b-97b7-08dad3979d37 X-LD-Processed: f7a17af6-1c5c-4a36-aa8b-f5be247aa4ba,ExtFwd X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:VI1PR04MB7104.eurprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230022)(376002)(396003)(136003)(39860400002)(346002)(366004)(451199015)(7406005)(4744005)(921005)(36756003)(66556008)(7416002)(66946007)(6666004)(110136005)(38100700002)(5660300002)(6512007)(316002)(186003)(31696002)(41300700001)(6506007)(8936002)(66476007)(2616005)(8676002)(4326008)(6486002)(478600001)(2906002)(31686004)(86362001)(53546011)(45980500001)(43740500002);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?OVlrZ1ptbTI2dlFISXNpbEFvdjZKM0E0K29tTytkNlJuNGN5R1pRSWR5aEIv?= =?utf-8?B?TnNOODBhaWVpbGlUUzZzMm0rQ2wzM0dacjlWcFdISVhQUEREL0xhQTNReCtD?= =?utf-8?B?MlhnNEUyckVMZElXa3lRc0xWN0JpQmU2QUlZYmRCYXZZRFJCd0hyeDdZb3BC?= =?utf-8?B?eFdiUzhZQm94blZ0NHBFOFlibzVITlM2RmpFWDBMUFRydkxOcy9NUXloR0E2?= =?utf-8?B?a2srNSt0T2pPK09uNGhFT2lmZ21HcXFua01jeTJhNjZJcnArYS9HZWVmWGNm?= =?utf-8?B?M29XT3ZpMmh1MUJ4clIxaEp0SWZpODJ2VjBMc1dyak9GSjV4Wk1meE1WL2N1?= =?utf-8?B?b3dSZ2NnVWpHUVYySEI3MUFKMkRGVUlZSUgrREdIM2FCejh2dUt0eWZLN2ZZ?= =?utf-8?B?Rk9keUdqNDVzZUxIRUJwQ1R1c2cwMFVhK3l2blpvRXkxbEFMUThqUEx1UUp2?= =?utf-8?B?QXBFNys3LzFNb0JLZlRWaU1UWlBiK2RQMUZUSVAxV1dzekt5eWtpTmY1WWx4?= =?utf-8?B?R2NnUndyL3ZJSDNnZ3lKUFB4ck5ENkhqNkRqRjFnR29HOGJKVWlhUHFqbDk2?= =?utf-8?B?M2toWmtnUnZWNkNTMnk4MHNMTHhXSkJEcC91cEdYcVh3aU1YQ1l5SFpjWXE3?= =?utf-8?B?cmRGd09NRk1jdExtNngzUW5lOW9zbEp3V09aMWRMbExXRmdVeERMWUJCa1JZ?= =?utf-8?B?WE94SXZOMkxIUW9GL25STlZ4Ymxrd3o0aWFPeWFGVU8zMUtER1RPeVZhOFBT?= =?utf-8?B?aE5mSllnaVFjS2ZVS0UyYmFGMkZvelh5cWJHYWc4Zko2aUdEUkVsZEZYTk1K?= =?utf-8?B?cit2WGRINzVXRHJMR2xrdG13QWpWTUFVbG9Lem9Ld0xZbStZblJ6MHYxNnZ4?= =?utf-8?B?YW9idUwwdlViZzQ0NzBHN2h5QTYyaUd3eGxNTElYUXVIV255NVVmbDk3Qllr?= =?utf-8?B?ZXJPeVA2Ukdib0ZhUjhGaE0zWjVTSmNnK0svVmRSNWMvUGJMdUJjZU5TWlVs?= =?utf-8?B?SHVRTG84VjB3djl4UmRhcWdnR1BWMmt2REcrdVBWSnZnbFUxZTJPM1lPOGxm?= =?utf-8?B?Q0NpN1JJQUJvNzBQakoxZ0lWZVYySXlhcjZMeEcrYjRhanZQdDcvUUxtWFN6?= =?utf-8?B?WFVVWTdJeUFmcGFsSW1nWXgvc2MvekdOSGlVaTRmQ0JFUHcvSDZxRk1KMElZ?= =?utf-8?B?VkUwcjFnRGlTSUF3R2p3REhTRnhNZkpWVTNqdGxQU2xjdnBkMFVnTnpBTmgv?= =?utf-8?B?a1RCUGRudjdpeCtFUGxjMU5PL0puajdlMEkyaXYzTjZ0c1ArbytBdmgxK3dS?= =?utf-8?B?TnpoUmUwTUhieVNtOG52Y1ZyaStjMGZheVFlbHlObnZIODJjTnNZTEQ5TURE?= =?utf-8?B?V09TMWcxa29FbERBaVQzRlZRelAvWDNxMlllbHQwcUNqYU41NkpnN2Y4ZTVQ?= =?utf-8?B?aGt6NUhkMmlCN0NhcXUvc2VZTTY4T3BjL3FBclBhV0FxVHhOeW94Y3JhMnRK?= =?utf-8?B?SmxTN1RFSVdIY2RQdkdrSGpLa2xNaEZ5bmRGYjIvOVBmOVEwaTJkNWVmaEM2?= =?utf-8?B?bVhEZVZEd0JmeDVvb2EzTlRMM0hFbFNTZVNhcDVtVU5aQlhLaGJtcXVPOXpW?= =?utf-8?B?YzJ6TS9HaTI2WUtvTzErd3J6dEp5d0pJa1RTeCtEN2dkMXZOc2VLTWFkNVZy?= =?utf-8?B?Z2NPdXZnTzJHMXNDcFBlOGdZZDhaL0VnTG9qUVpLZDFyaGZBOUpURnd0UXgy?= =?utf-8?B?dU9QWGcxdVVZaXYybnphazN4L1dKUHBScjFGZEliRGo5UGpuYWF2bVhBazZY?= =?utf-8?B?VGpjVVNXY1VPZEp3L0gvRnRjMUdTTGtCL1FiblhlbXFYbTI5cVhLMWRIUEpm?= =?utf-8?B?Tk0xa3FNRkt2aDFUVUZ2cWJiWVB5WkZDVWhVbm10Q2twY2prd3ZWZlo5V1Bi?= =?utf-8?B?WG1ZSFFXK01aR1R3Yk1EZHhLZlEzNzQ0dXJqakpMMFRNOEVaRUtqRFVYVlYv?= =?utf-8?B?bmNlOVVQQjllT1RvblhMbjVIOWtBRS81VU1hcTlncmZmc0QydFBHNTRLLzhS?= =?utf-8?B?T21RMmZOK1pWM3QveldCWW90ZWUrbU9ScDYwRFVqRVl4U0lORUEyaDRvcDB4?= =?utf-8?B?NGp6QkpjYTRNR0piSnRPU1dZZEpDMzROWjNMdmYwenZ3UnhjbG84bVVoSU8x?= =?utf-8?Q?JFcao0VCb3jYRTJVFTLNZGmc5RBKCYEQxjcQNk2JFBOc?= X-OriginatorOrg: suse.com X-MS-Exchange-CrossTenant-Network-Message-Id: 29c366d0-5774-4a3b-97b7-08dad3979d37 X-MS-Exchange-CrossTenant-AuthSource: VI1PR04MB7104.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Dec 2022 12:28:56.0173 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: f7a17af6-1c5c-4a36-aa8b-f5be247aa4ba X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: sy2UDu5ykQolAf69IiRIuk8PvYqQdxYUYZRj7WM4ObYqmqhC0KI8te3qkmjREbzF6vXnR7/FSIW5WTl3+D0Vxw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM9PR04MB8455 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221201_042904_936273_7317EC41 X-CRM114-Status: UNSURE ( 9.07 ) X-CRM114-Notice: Please train this message. X-Mailman-Approved-At: Thu, 01 Dec 2022 04:53:37 -0800 X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org On 01.12.22 12:08, Ricardo Ribalda wrote: > If we are shutting down due to kexec and the userspace is frozen, the > system will stall forever waiting for userspace to complete. > > Do not wait for the clients to complete in that case. Hi, I am afraid I have to state that this approach is bad in every case, not just this corner case. It basically means that user space can stall the kernel for an arbitrary amount of time. And we cannot have that. Regards Oliver _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec