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 139FDC433E1 for ; Mon, 18 May 2020 12:44:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DE5FD20674 for ; Mon, 18 May 2020 12:44:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1589805874; bh=xjt8SYpCaF9HcJR74gTd+H/T5qtnboYe7TcBeFf+TAs=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:List-ID: From; b=PM9453MeUCsvw5yyei+U9sDDmACQd2hEAysafz7TT7Yk1lqzrls9quVBbMRbM4VEw qGYOMWVjRmtG+QvQDNHuJ+nLl6luHTEEpMsU8JdTcQPDxjAZd8CCMyyXgy1kX0DcA0 /9AGeIsAD4v7rqsK1oAR4FH0LvVoxriPrQHAeLOA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727869AbgERMod (ORCPT ); Mon, 18 May 2020 08:44:33 -0400 Received: from mail.kernel.org ([198.145.29.99]:39348 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727831AbgERMoc (ORCPT ); Mon, 18 May 2020 08:44:32 -0400 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 4152D2067D; Mon, 18 May 2020 12:44:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1589805872; bh=xjt8SYpCaF9HcJR74gTd+H/T5qtnboYe7TcBeFf+TAs=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:From; b=PoKtGx9Ml3dl752X/l1tSDCh6MTYfxD8pi4oil1Tg54xVScdSVjVkbmrn5QmwZ+wA fcGdQPoGA4MAU5nmms60TNtypEjMCknHsWbrk3yj4jcjChAnwe1i/29MMZijGCDlBm Oc6/Fdk87ffARy9pAZ14sB6s0W2/lsSuxFKITtdU= Received: by paulmck-ThinkPad-P72.home (Postfix, from userid 1000) id F383035232C9; Mon, 18 May 2020 05:44:31 -0700 (PDT) Date: Mon, 18 May 2020 05:44:31 -0700 From: "Paul E. McKenney" To: Rong Chen Cc: Qian Cai , Stephen Rothwell , Linux Next Mailing List , Linux Kernel Mailing List , Madhuparna Bhowmik , Amol Grover , Dmitry Vyukov , philip.li@intel.com, lkp@intel.com, fengguang.wu@intel.com Subject: Re: Default enable RCU list lockdep debugging with PROVE_RCU Message-ID: <20200518124431.GU2869@paulmck-ThinkPad-P72> Reply-To: paulmck@kernel.org References: <20200514181305.GT2869@paulmck-ThinkPad-P72> <20200517214716.GT2869@paulmck-ThinkPad-P72> <659206f4-d326-4fd6-3091-085c7eabf280@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <659206f4-d326-4fd6-3091-085c7eabf280@intel.com> 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 Mon, May 18, 2020 at 01:54:13PM +0800, Rong Chen wrote: > > > On 5/18/20 5:47 AM, Paul E. McKenney wrote: > > On Fri, May 15, 2020 at 02:36:26PM -0400, Qian Cai wrote: > > > > > > > On May 14, 2020, at 2:13 PM, Paul E. McKenney wrote: > > > > > > > > Fair enough! And yes, the Linux kernel is quite large, so I certainly am > > > > not asking you to test the whole thing yourself. > > > Ok, I saw 0day bot also started to report those which is good. For example, > > > > > > lkml.org/lkml/2020/5/12/1358 > > > > > > which so far is nit blocking 0day on linux-next since it does not use panic_on_warn yet (while syzbot does). > > > > > > Thus, I am more convinced that we should not revert the commit just for syzbot until someone could also convince 0day to select RCU_EXPERT and then DEBUG_RCU_LIST? > > Let's ask the 0day people, now CCed, if they would be willing to > > build with CONFIG_RCU_EXPERT=y and CONFIG_DEBUG_RCU_LIST=y on some > > fraction of their testing. ;-) > > > > Thanx, Paul > > Hi, > > Thanks for your advice, we'll support it in the near future. Thank you very much! Thanx, Paul