Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759429AbXE0UdW (ORCPT ); Sun, 27 May 2007 16:33:22 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755728AbXE0UdP (ORCPT ); Sun, 27 May 2007 16:33:15 -0400 Received: from waste.org ([66.93.16.53]:37804 "EHLO waste.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755490AbXE0UdP (ORCPT ); Sun, 27 May 2007 16:33:15 -0400 Date: Sun, 27 May 2007 15:32:21 -0500 From: Matt Mackall To: Thomas Gleixner Cc: Folkert van Heusden , Parag Warudkar , linux-kernel@vger.kernel.org, Stephen Hemminger Subject: Re: [2.6.21.1] soft lockup when removing netconsole module Message-ID: <20070527203221.GF11166@waste.org> References: <20070526154011.GB3735@vanheusden.com> <465857DF.2020603@gmail.com> <1180195927.4264.11.camel@chaos> <20070526161645.GA11760@vanheusden.com> <1180197324.4264.23.camel@chaos> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1180197324.4264.23.camel@chaos> User-Agent: Mutt/1.5.13 (2006-08-11) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2025 Lines: 36 On Sat, May 26, 2007 at 06:35:24PM +0200, Thomas Gleixner wrote: > On Sat, 2007-05-26 at 18:17 +0200, Folkert van Heusden wrote: > > > > Seems to be hrtimers related - CC'ed Thomas. > > > I doubt that. The tick interrupt just finds out, that the machine is > > > stuck in rmmod. > > > > > Also the rmmod hangs and would not exit even with kill -9. It also > > > > > sucks up 100% cpu. > > > Can you please enable CONFIG_PROVE_LOCKING ? > > > > Luckily I already had :-) > > Here is its output: > > So there is no output from lockdep, during the rmmod hang ? The rmmod > sucks 100% cpu, so it busy loops at some place. Looking at the stack > trace this seems to be in: > > > void cancel_rearming_delayed_workqueue(struct workqueue_struct *wq, > struct delayed_work *dwork) > { > while (!cancel_delayed_work(dwork)) > flush_workqueue(wq); > } > > which is not really related to timers :) Looks like Steve added the delayed work bits, though I never saw any of his patches. -- Mathematics is the supreme nostalgia of our time. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/