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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3797FC433F5 for ; Thu, 19 May 2022 13:15:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238512AbiESNPT (ORCPT ); Thu, 19 May 2022 09:15:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45622 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232830AbiESNPR (ORCPT ); Thu, 19 May 2022 09:15:17 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1088FC5E6E for ; Thu, 19 May 2022 06:15:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=1Qau8N189c6qQ1DvRBrKCoXkXc1SDys4onw+5HcpY5E=; b=fcDupoRAlyaVYJq+I47XWhkzlj 6WSik0t0jWw6bEJbJ8K6IS8g+pPNRZfPo2b9CE5dH8ULDL9XeXn2X3tPp+9zJRWkQ+UG7xHz2OLlG eS8lksWeyKEULSEXCW0T8BNsyBhIl9EHRHZZydwa35qv8lXv8zUnR+8N8gAeMc7B/x47PraXHowS5 KKh8zkxkGOGv+fZbEqNbzXI2WHm9Ip9xuIK8tp+UGFRzGzIBBHQXpBJyrX+w11iUv7X+QAjTvBaw3 9pngOvaUDh2w/ptQUfGR3CC8Z//WWDiHBJ10a9Ygo09cBObNZEVeWEQE5+/nhq3lpLbD02+R5KYid qtrcc84Q==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=worktop.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1nrfzT-00CkKT-0P; Thu, 19 May 2022 13:14:55 +0000 Received: by worktop.programming.kicks-ass.net (Postfix, from userid 1000) id 8B351980E0B; Thu, 19 May 2022 15:14:52 +0200 (CEST) Date: Thu, 19 May 2022 15:14:52 +0200 From: Peter Zijlstra To: Jing-Ting Wu Cc: Daniel Bristot de Oliveira , Valentin Schneider , tglx@linutronix.de, wsd_upstream@mediatek.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, Jonathan.JMChen@mediatek.com, "chris.redpath@arm.com" , Dietmar Eggemann , Vincent Donnefort , Ingo Molnar , Juri Lelli , Vincent Guittot , Steven Rostedt , Ben Segall , Mel Gorman , Christian Brauner Subject: Re: [Bug] Race condition between CPU hotplug off flow and __sched_setscheduler() Message-ID: <20220519131452.GG2578@worktop.programming.kicks-ass.net> References: <4a0aa13c99ffd6aea6426f83314aa2a91bc8933f.camel@mediatek.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4a0aa13c99ffd6aea6426f83314aa2a91bc8933f.camel@mediatek.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, May 19, 2022 at 08:53:15PM +0800, Jing-Ting Wu wrote: > Hi all > > > There is a race condition between CPU hotplug off flow and > __sched_setscheduler(), which will cause hang-up in CPU hotplug off > flow. Oooh, you're using core scheduling and the A/B are SMT siblings? 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 B5106C433F5 for ; Thu, 19 May 2022 13:19:20 +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-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=rQhJ2ie7A+CKtBwvwOsJ1bIqUkffAmxUOIF/7rb0FxQ=; b=UzfmYl4qBYdVky WaLH1CRhWzght+c5gtq37KcgPV6uhgq/1St230Wo7iancdhK9OgILHeICUjn05yD1J7jhvvw9Clsd IKb2V0nbHCfieNvkp/Dd6qSZVMevu9tfjfLPY+ZkfcwUax9hKi6ssGL1/FZ8g71cvcxyPkP0Dm98h UcoSzTICSh5QX0jmJ1WwBZ15J8973kKECzkc1IzJeAPNWCnbT8R42mLGyMcfLstmSqO1YJ/BG0LgL XfPvqOx00rloIjORs7vTNmHNsElFlaNc525YUYhwgnEmWMtQcUFmBF5giXmbFIJ4AQ6/3TQR/MKX5 wxxp1OJcUrTbbaGoa/cA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nrg3f-006z8L-6A; Thu, 19 May 2022 13:19:15 +0000 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nrfzb-006wzt-Uk; Thu, 19 May 2022 13:15:03 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=1Qau8N189c6qQ1DvRBrKCoXkXc1SDys4onw+5HcpY5E=; b=fcDupoRAlyaVYJq+I47XWhkzlj 6WSik0t0jWw6bEJbJ8K6IS8g+pPNRZfPo2b9CE5dH8ULDL9XeXn2X3tPp+9zJRWkQ+UG7xHz2OLlG eS8lksWeyKEULSEXCW0T8BNsyBhIl9EHRHZZydwa35qv8lXv8zUnR+8N8gAeMc7B/x47PraXHowS5 KKh8zkxkGOGv+fZbEqNbzXI2WHm9Ip9xuIK8tp+UGFRzGzIBBHQXpBJyrX+w11iUv7X+QAjTvBaw3 9pngOvaUDh2w/ptQUfGR3CC8Z//WWDiHBJ10a9Ygo09cBObNZEVeWEQE5+/nhq3lpLbD02+R5KYid qtrcc84Q==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=worktop.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1nrfzT-00CkKT-0P; Thu, 19 May 2022 13:14:55 +0000 Received: by worktop.programming.kicks-ass.net (Postfix, from userid 1000) id 8B351980E0B; Thu, 19 May 2022 15:14:52 +0200 (CEST) Date: Thu, 19 May 2022 15:14:52 +0200 From: Peter Zijlstra To: Jing-Ting Wu Cc: Daniel Bristot de Oliveira , Valentin Schneider , tglx@linutronix.de, wsd_upstream@mediatek.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, Jonathan.JMChen@mediatek.com, "chris.redpath@arm.com" , Dietmar Eggemann , Vincent Donnefort , Ingo Molnar , Juri Lelli , Vincent Guittot , Steven Rostedt , Ben Segall , Mel Gorman , Christian Brauner Subject: Re: [Bug] Race condition between CPU hotplug off flow and __sched_setscheduler() Message-ID: <20220519131452.GG2578@worktop.programming.kicks-ass.net> References: <4a0aa13c99ffd6aea6426f83314aa2a91bc8933f.camel@mediatek.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <4a0aa13c99ffd6aea6426f83314aa2a91bc8933f.camel@mediatek.com> X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org On Thu, May 19, 2022 at 08:53:15PM +0800, Jing-Ting Wu wrote: > Hi all > > > There is a race condition between CPU hotplug off flow and > __sched_setscheduler(), which will cause hang-up in CPU hotplug off > flow. Oooh, you're using core scheduling and the A/B are SMT siblings? _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek 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 CABA1C433F5 for ; Thu, 19 May 2022 13:19:57 +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-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=kO6z73vXJP2new6OIeMp/QTBGMGajmJhrYzCdwLHjNk=; b=JhKqgoMTVhnsrL m+mnRriRU6sT0/jnH5arsuptLdlPggNNtBT2GrkY2kHPgSDLjowiuTYkfrMs73bbxjpgwa/dyZy1j LS9FyYusGWIi25rA3kYKvK/k9KonBWeV5OvlMG25ncmn5FGR1WjXqAYK3nOo0I9jXka6uEMEuYieo NAVJdyaBiU+Pwt66NtEvw7Z8ge0GmIUGkm7TqSbSWFMp4GDQG04Msx8/w3NeCzGyk9Evn0d0qHt+X zBSX99zMGpapaKE5IkQC8SsMktiw5ASTPYkVbuNIbNEK/QiKW6y0ErzI86ltdHXFqWUAf8zfcFbk8 m6kizhDa6qwGH+1A+uDQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nrg37-006ypE-8W; Thu, 19 May 2022 13:18:41 +0000 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nrfzb-006wzt-Uk; Thu, 19 May 2022 13:15:03 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=1Qau8N189c6qQ1DvRBrKCoXkXc1SDys4onw+5HcpY5E=; b=fcDupoRAlyaVYJq+I47XWhkzlj 6WSik0t0jWw6bEJbJ8K6IS8g+pPNRZfPo2b9CE5dH8ULDL9XeXn2X3tPp+9zJRWkQ+UG7xHz2OLlG eS8lksWeyKEULSEXCW0T8BNsyBhIl9EHRHZZydwa35qv8lXv8zUnR+8N8gAeMc7B/x47PraXHowS5 KKh8zkxkGOGv+fZbEqNbzXI2WHm9Ip9xuIK8tp+UGFRzGzIBBHQXpBJyrX+w11iUv7X+QAjTvBaw3 9pngOvaUDh2w/ptQUfGR3CC8Z//WWDiHBJ10a9Ygo09cBObNZEVeWEQE5+/nhq3lpLbD02+R5KYid qtrcc84Q==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=worktop.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1nrfzT-00CkKT-0P; Thu, 19 May 2022 13:14:55 +0000 Received: by worktop.programming.kicks-ass.net (Postfix, from userid 1000) id 8B351980E0B; Thu, 19 May 2022 15:14:52 +0200 (CEST) Date: Thu, 19 May 2022 15:14:52 +0200 From: Peter Zijlstra To: Jing-Ting Wu Cc: Daniel Bristot de Oliveira , Valentin Schneider , tglx@linutronix.de, wsd_upstream@mediatek.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, Jonathan.JMChen@mediatek.com, "chris.redpath@arm.com" , Dietmar Eggemann , Vincent Donnefort , Ingo Molnar , Juri Lelli , Vincent Guittot , Steven Rostedt , Ben Segall , Mel Gorman , Christian Brauner Subject: Re: [Bug] Race condition between CPU hotplug off flow and __sched_setscheduler() Message-ID: <20220519131452.GG2578@worktop.programming.kicks-ass.net> References: <4a0aa13c99ffd6aea6426f83314aa2a91bc8933f.camel@mediatek.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <4a0aa13c99ffd6aea6426f83314aa2a91bc8933f.camel@mediatek.com> X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, May 19, 2022 at 08:53:15PM +0800, Jing-Ting Wu wrote: > Hi all > > > There is a race condition between CPU hotplug off flow and > __sched_setscheduler(), which will cause hang-up in CPU hotplug off > flow. Oooh, you're using core scheduling and the A/B are SMT siblings? _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel