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=-3.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED,USER_AGENT_NEOMUTT autolearn=ham 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 D6796C10F0E for ; Mon, 15 Apr 2019 10:40:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 972EA2064A for ; Mon, 15 Apr 2019 10:40:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727137AbfDOKku (ORCPT ); Mon, 15 Apr 2019 06:40:50 -0400 Received: from Galois.linutronix.de ([146.0.238.70]:45323 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726500AbfDOKku (ORCPT ); Mon, 15 Apr 2019 06:40:50 -0400 Received: from bigeasy by Galois.linutronix.de with local (Exim 4.80) (envelope-from ) id 1hFz2d-0005MO-LP; Mon, 15 Apr 2019 12:40:47 +0200 Date: Mon, 15 Apr 2019 12:40:47 +0200 From: Sebastian Andrzej Siewior To: "Paul E. McKenney" Cc: linux-kernel@vger.kernel.org Subject: Re: Alleged fix for writer stall on -rcu branch dev Message-ID: <20190415104047.mrtmv6w6kq5m44fp@linutronix.de> References: <20190409221426.GA11212@linux.ibm.com> <20190410181538.3ocva5lmh7ghrisr@linutronix.de> <20190410184105.GR14111@linux.ibm.com> <20190410191918.g2yqnsmuqukmzdfe@linutronix.de> <20190410203302.GT14111@linux.ibm.com> <20190411000610.GA3867@linux.ibm.com> <20190413142153.GA17704@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20190413142153.GA17704@linux.ibm.com> User-Agent: NeoMutt/20180716 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2019-04-13 07:21:53 [-0700], Paul E. McKenney wrote: > > And after ramping up the stress in rcutorture a bit, I am able to > reproduce this CPU stall involving offlining on my systems. My plan is > my usual one: Keep increasing rcutorture stress to get it to reproduce > in reasonable time, add diagnostics as appropriate, and continue making > forward-progress improvements in RCU itself. I *think* this one is also new: |Assertion failure in /home/bigeasy/linux-rt/tools/testing/selftests/rcutorture/res/2019.04.14-14:28:40/TREE03.37/console.log TREE03 |Summary: Warnings: 6 Call Traces: 6 https://breakpoint.cc/console-03.37.log |Assertion failure in /home/bigeasy/linux-rt/tools/testing/selftests/rcutorture/res/2019.04.14-14:28:40/TREE03.39/console.log TREE03 |Summary: Warnings: 4 Call Traces: 4 https://breakpoint.cc/console-03.39.log This is still commit 33e04e451279 ("torture: Allow inter-stutter interval to be specified"). > Thank you very much for locating this one!!! You are welcome. > Thanx, Paul Sebastian