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=-2.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, 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 41C90C2D0CB for ; Sun, 15 Dec 2019 20:18:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1BCA724687 for ; Sun, 15 Dec 2019 20:18:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576441106; bh=zFE4EGcQh8WBJGzFWrKMN5N00t3tOMf+3/Nlkl2VYYg=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:List-ID: From; b=L0j17auv1kjrKu2hnszqalmVFtHmtN7vBrfElxiTWSmqppsIt4aRlnmA2AHZ8GgPq EC4sA/pJkyPYyvI4n/wVTFQ9rwotlwWAtgJ9pdhHN9LfjWBzi60ud0H0aS4M0vStIL MNZqyPk5zJ2OHgpCEIFqLDAzv3wCDLaM3vsn009Q= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726488AbfLOUSY (ORCPT ); Sun, 15 Dec 2019 15:18:24 -0500 Received: from mail.kernel.org ([198.145.29.99]:58560 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726146AbfLOUSY (ORCPT ); Sun, 15 Dec 2019 15:18:24 -0500 Received: from paulmck-ThinkPad-P72.home (50-39-105-78.bvtn.or.frontiernet.net [50.39.105.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id EF42520700; Sun, 15 Dec 2019 20:18:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576441104; bh=zFE4EGcQh8WBJGzFWrKMN5N00t3tOMf+3/Nlkl2VYYg=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:From; b=FgbLMTMralCkb9e+jUwjYafHt0Kxfn+LF2Td3S9ChHA4OSQsjgBbT+Fss06C6j2ci lhxN91WP/P6/FLvLbTCWLDOD2YZIPHAYjY9c1M7gKMI4ir2Jfo6F4MtjVoJpTuNiqp NZ1FNDO2phPsqcj9idSw6Fz3ofjSVJXs0Mils9HI= Received: by paulmck-ThinkPad-P72.home (Postfix, from userid 1000) id CCF1F352274B; Sun, 15 Dec 2019 12:18:23 -0800 (PST) Date: Sun, 15 Dec 2019 12:18:23 -0800 From: "Paul E. McKenney" To: Qian Cai Cc: Dexuan-Linux Cui , "Joel Fernandes (Google)" , Tejun Heo , Josh Triplett , Steven Rostedt , rcu@vger.kernel.org, Linux Kernel Mailing List , Lili Deng , Dexuan Cui , Baihua Lu Subject: Re: "rcu: React to callback overload by aggressively seeking quiescent states" hangs on boot Message-ID: <20191215201823.GL2889@paulmck-ThinkPad-P72> Reply-To: paulmck@kernel.org References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Dec 15, 2019 at 02:53:37PM -0500, Qian Cai wrote: > > On Dec 15, 2019, at 2:18 PM, Dexuan-Linux Cui wrote: > > We're seeing the same hang issue with a recent Linux next-20191213 > > kernel. If we revert the same commit 82150cb53dcb ("rcu: React to > > callback overload by aggressively seeking quiescent states”), the > > issue will go away. > > Does this patch work for you? > > https://lore.kernel.org/rcu/20191215065242.7155-1-cai@lca.pw Same question for this one: https://lore.kernel.org/lkml/20191215201646.GK2889@paulmck-ThinkPad-P72/ Thanx, Paul