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 4C5A6C43603 for ; Sat, 14 Dec 2019 06:40:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 206522465B for ; Sat, 14 Dec 2019 06:40:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576305651; bh=ywRbms/3SILxNnbJWJRfGsJaom/QIpHbbWAIN9MG/Xc=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:List-ID: From; b=pAqG+edKJtQQsk09PfXCfE3K6y/Ue/GjOYSmddJOXlDJpW2RSqA2WU7IeBsI/AVre HyjSEydBZVsnbw8jBBSoguHcM0AN1/m8BdWBon8sCFtk8tIaKdoVUyKkOczI5bAmNI MwVytcCG+DtEJwYeDIUYOWct4vFgtMnrtq9PVAr4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725862AbfLNGku (ORCPT ); Sat, 14 Dec 2019 01:40:50 -0500 Received: from mail.kernel.org ([198.145.29.99]:59922 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725372AbfLNGku (ORCPT ); Sat, 14 Dec 2019 01:40:50 -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 E87B6214AF; Sat, 14 Dec 2019 06:40:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576305650; bh=ywRbms/3SILxNnbJWJRfGsJaom/QIpHbbWAIN9MG/Xc=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:From; b=TArLbUEdqOTQ8RP5TNPmRuqZQ8TG3JA6KzrdenMoMMjnXeYmQPORLO7UEPY7POfac Yeal7xjT9zoRYp+MZrHMkz1JLowXAyh4OtbA8haXK56LY70Coi6IUa3UD+Q9bUj3qK gwSEDUpqQXmwgQTElBrSc7uMW7mjJ+Q2rzvw7n78= Received: by paulmck-ThinkPad-P72.home (Postfix, from userid 1000) id 13534352276B; Fri, 13 Dec 2019 22:40:48 -0800 (PST) Date: Fri, 13 Dec 2019 22:40:48 -0800 From: "Paul E. McKenney" To: Qian Cai Cc: "Joel Fernandes (Google)" , Tejun Heo , Josh Triplett , Steven Rostedt , rcu@vger.kernel.org, Linux Kernel Mailing List Subject: Re: "rcu: React to callback overload by aggressively seeking quiescent states" hangs on boot Message-ID: <20191214064048.GI2889@paulmck-ThinkPad-P72> Reply-To: paulmck@kernel.org References: <20191213224646.GH2889@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) Sender: rcu-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org On Fri, Dec 13, 2019 at 06:11:16PM -0500, Qian Cai wrote: > > > > On Dec 13, 2019, at 5:46 PM, Paul E. McKenney wrote: > > > > I am running this on a number of x86 systems, but will try it on a > > The config to reproduce includes several debugging options that might > required to recreate. If you run without those debugging options, do you still see the hangs? If not, please let me know which debugging are involved. > > wider variety. If I cannot reproduce it, would you be willing to > > run diagnostics? > > Yes. Very good! Let me see what I can put together. (No luck reproducing at my end thus far.) > > Just to double-check... Are you running rcutorture built into the kernel? > > (My guess is "no", but figured that I should ask.) > > No as you can see from the config I linked in the original email. Fair point, and please accept my apologies for the pointless question. Thanx, Paul