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=-7.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 89D6CC433DB for ; Mon, 11 Jan 2021 15:12:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 52C8622795 for ; Mon, 11 Jan 2021 15:12:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730209AbhAKPMB (ORCPT ); Mon, 11 Jan 2021 10:12:01 -0500 Received: from mail.kernel.org ([198.145.29.99]:52992 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726459AbhAKPMB (ORCPT ); Mon, 11 Jan 2021 10:12:01 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id C3E1C225AC; Mon, 11 Jan 2021 15:11:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1610377880; bh=zElW2sWDzyZfO6SBLVrf34EqGMQd6Z7qO+5MC7vj4DQ=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:From; b=vFe9g/bHlzijbYHVoIv5uiWmx4S8FaXK6WLkvyWjRZCmkOdKVVlL3Pah5Oi4E7A1i I8fdi0P3cJlVRS4wA7PGkrcDNQ+tanNfZVy6Xw7L814rplAkMZgZhCwvT8rMUJu6+0 gaHuzkG+21mIZehn6/y+vDx2e9+Wpupx2vCV49MN1DXlh+qB0BFfR9r54e1xsmxFYc LqqnevpjVH7r73AcntW71yyr2O2Pkq+IoPXmwsuybAoPGoVQbA8SRWFM01MtHyCgA5 GYsTcoXpqmxlfjaCbL0Dp1ae6o3pFjPO6zChH/Fpld2GRN87krXEfXSzVmBADWyBsk X7EIrUGD9Hk2Q== Received: by paulmck-ThinkPad-P72.home (Postfix, from userid 1000) id 9392735226C6; Mon, 11 Jan 2021 07:11:20 -0800 (PST) Date: Mon, 11 Jan 2021 07:11:20 -0800 From: "Paul E. McKenney" To: Peter Zijlstra Cc: tglx@linutronix.de, linux-kernel@vger.kernel.org, valentin.schneider@arm.com, bristot@redhat.com, frederic@kernel.org Subject: Re: lockdep splat in v5.11-rc1 involving console_sem and rq locks Message-ID: <20210111151120.GD2743@paulmck-ThinkPad-P72> Reply-To: paulmck@kernel.org References: <20210105220115.GA27357@paulmck-ThinkPad-P72> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jan 11, 2021 at 03:42:28PM +0100, Peter Zijlstra wrote: > On Tue, Jan 05, 2021 at 02:01:15PM -0800, Paul E. McKenney wrote: > > Hello! > > > > The RUDE01 rcutorture scenario (and less often, the TASKS01 scenario) > > Is: > > tools/testing/selftests/rcutorture/bin/kvm.sh --duration 10 --configs RUDE01 --allcpus > > the right incantation? I responded on IRC, but may as well make it official: tools/testing/selftests/rcutorture/bin/kvm.sh --allcpus --duration 10 --configs '32*RUDE01' --trust-make This assumes a 64-CPU box, hence for this two-CPU scenario "32*". This will run 32 concurrent instances of RUDE01, thus reproducing more quickly. The "--trust-make" is important in your case to avoid clobbering your tags files. Thanx, Paul