From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757873Ab2EGVe4 (ORCPT ); Mon, 7 May 2012 17:34:56 -0400 Received: from mail-yx0-f174.google.com ([209.85.213.174]:63542 "EHLO mail-yx0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753278Ab2EGVey (ORCPT ); Mon, 7 May 2012 17:34:54 -0400 Date: Mon, 7 May 2012 14:34:49 -0700 From: Tejun Heo To: "Paul E. McKenney" Cc: linux-kernel@vger.kernel.org Subject: Re: Warning in worker_enter_idle() Message-ID: <20120507213449.GM19417@google.com> References: <20120506153814.GA25681@linux.vnet.ibm.com> <20120507194042.GG19417@google.com> <20120507205516.GD21152@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120507205516.GD21152@linux.vnet.ibm.com> User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, On Mon, May 07, 2012 at 01:55:16PM -0700, Paul E. McKenney wrote: > I was running rcutorture with CPU hotplug operations. It has happened > a couple of times on the .config that I attached, but never under any > of the other 13 .configs that I run. Ah, okay. The invariant breaks when CPU detaches. The WARN_ON() probably just needs a condition to disable it if the gcwq is detached. I'll look into it tomorrow. Thanks. -- tejun