From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751778AbaJ1Q1t (ORCPT ); Tue, 28 Oct 2014 12:27:49 -0400 Received: from e8.ny.us.ibm.com ([32.97.182.138]:48130 "EHLO e8.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751254AbaJ1Q1r (ORCPT ); Tue, 28 Oct 2014 12:27:47 -0400 Date: Tue, 28 Oct 2014 05:49:42 -0700 From: "Paul E. McKenney" To: Meelis Roos Cc: Linux Kernel list Subject: Re: hung tasks in 3.18.0-rc1-00221-gc3351df Message-ID: <20141028124942.GN5718@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20141024001822.GK4977@linux.vnet.ibm.com> <20141024145509.GO4977@linux.vnet.ibm.com> <20141027174424.GB27568@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 14102816-0029-0000-0000-000000F33BB1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Oct 28, 2014 at 10:16:43AM +0200, Meelis Roos wrote: > > rcu: Make rcu_barrier() understand about missing rcuo kthreads > > I can not trigger the previous problem at will so my testing is not very > useful. I tested the previous patch that you sent but the problem did > not trigger, and yesterday applied this one and it still does not > trigger, but I an using remote sessions only for now (no desktop). > > At least it's not clearly broken :) A couple of other people had more reproducible test setups and confirmed that it fixed them. But yes, there are no doubt other RCU bugs waiting to be found. ;-) Thanx, Paul