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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 DAD18C432C3 for ; Fri, 15 Jan 2021 13:07:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AC9DE2313E for ; Fri, 15 Jan 2021 13:07:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728795AbhAONHd (ORCPT ); Fri, 15 Jan 2021 08:07:33 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46454 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732778AbhAONH2 (ORCPT ); Fri, 15 Jan 2021 08:07:28 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 88C48C0613D3 for ; Fri, 15 Jan 2021 05:06:48 -0800 (PST) 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=4hCJR1XpGxzoY7Z8SGdX7VVnmJPSGSe1Nv9um16SGP8=; b=AE05uDUwr/LXFSxo8iOKuv+SZY W3+NTFISAtuSbotoa8GSl/lhs+843JIjrCtTFn/Vqe61GcALdaKJNe1fVRLBEfhsK83XYv4nEUUC+ VPG+oPy1ZYKru9wdepbl7eSEutue7qN1T3IAf8Sdfhig8ok25oRXKbaPxEGvwZXbbvoN35/gtlJYy fXHAv4KZw/IOtkd3u+QHwo2ELtuTY4oFH/UN+0ijTR3VJJf81V6m9WEPlG7OcobuHWSz8+ICMDf1F 1at+Ao/ZVcJ9dFOsTbrGIOMPuJh0w1aBOx9B5gwpWHbUaSuqMhnO/kd8gGskFiNEYlo218OXmHBqd U89qWqyg==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.94 #2 (Red Hat Linux)) id 1l0OmD-008xXB-Rw; Fri, 15 Jan 2021 13:04:42 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 2FC3530791E; Fri, 15 Jan 2021 14:04:27 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 0CC2823654448; Fri, 15 Jan 2021 14:04:27 +0100 (CET) Date: Fri, 15 Jan 2021 14:04:26 +0100 From: Peter Zijlstra To: "Paul E. McKenney" Cc: Thomas Gleixner , Lai Jiangshan , linux-kernel@vger.kernel.org, Valentin Schneider , Qian Cai , Vincent Donnefort , Dexuan Cui , Lai Jiangshan , Vincent Guittot , Steven Rostedt Subject: Re: [PATCH -tip V3 0/8] workqueue: break affinity initiatively Message-ID: References: <20201226025117.2770-1-jiangshanlai@gmail.com> <87o8hv7pnd.fsf@nanos.tec.linutronix.de> <20210111180907.GE2743@paulmck-ThinkPad-P72> <20210111215052.GA19589@paulmck-ThinkPad-P72> <20210112171411.GA22823@paulmck-ThinkPad-P72> <20210112235324.GA17895@paulmck-ThinkPad-P72> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jan 15, 2021 at 10:11:51AM +0100, Peter Zijlstra wrote: > On Tue, Jan 12, 2021 at 03:53:24PM -0800, Paul E. McKenney wrote: > > An SRCU-P run on the new series reproduced the warning below. Repeat-by: > > > > tools/testing/selftests/rcutorture/bin/kvm.sh --allcpus --duration 10 --configs "112*SRCU-P" --bootargs "rcupdate.rcu_cpu_stall_suppress_at_boot=1 torture.disable_onoff_at_boot rcupdate.rcu_task_stall_timeout=30000 rcutree.softirq=0" --trust-make > > Lemme go wake up an EX ;-) Whee, rescuer thread goes wobbly... took a few hours but there you have it. All I've got so far is fugly, gotta think harder.