From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763908AbXEZQtn (ORCPT ); Sat, 26 May 2007 12:49:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753055AbXEZQth (ORCPT ); Sat, 26 May 2007 12:49:37 -0400 Received: from keetweej.vanheusden.com ([213.84.46.114]:38784 "EHLO keetweej.vanheusden.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752783AbXEZQtg (ORCPT ); Sat, 26 May 2007 12:49:36 -0400 Date: Sat, 26 May 2007 18:49:35 +0200 From: Folkert van Heusden To: Thomas Gleixner Cc: Parag Warudkar , linux-kernel@vger.kernel.org Subject: Re: [2.6.21.1] soft lockup when removing netconsole module Message-ID: <20070526164934.GE11760@vanheusden.com> 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=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <1180197324.4264.23.camel@chaos> Organization: www.unixexpert.nl X-Chameleon-Return-To: folkert@vanheusden.com X-Xfmail-Return-To: folkert@vanheusden.com X-Phonenumber: +31-6-41278122 X-URL: http://www.vanheusden.com/ X-PGP-KeyID: 1F28D8AE X-GPG-fingerprint: AC89 09CE 41F2 00B4 FCF2 B174 3019 0E8C 1F28 D8AE X-Key: http://pgp.surfnet.nl:11371/pks/lookup?op=get&search=0x1F28D8AE Read-Receipt-To: Reply-By: Sun May 27 17:52:04 CEST 2007 X-Message-Flag: Want to extend your PGP web-of-trust? Coordinate a key-signing at www.biglumber.com User-Agent: Mutt/1.5.13 (2006-08-11) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > > > > 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 Nope, just other subsystems (nfs, usb) minutes before that. > 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 :) Ok. Folkert van Heusden -- Multitail - gibkaja utilita po sledovaniju log-fajlov i vyvoda kommand. Fil'trovanie, raskrašivanie, slijanie, vizual'noe sravnenie, i t.d. http://www.vanheusden.com/multitail/ ---------------------------------------------------------------------- Phone: +31-6-41278122, PGP-key: 1F28D8AE, www.vanheusden.com