From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932130AbXCKU6H (ORCPT ); Sun, 11 Mar 2007 16:58:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932253AbXCKU6H (ORCPT ); Sun, 11 Mar 2007 16:58:07 -0400 Received: from mx1.redhat.com ([66.187.233.31]:60062 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932130AbXCKU6G (ORCPT ); Sun, 11 Mar 2007 16:58:06 -0400 Message-ID: <45F46D33.1050808@redhat.com> Date: Sun, 11 Mar 2007 21:57:23 +0100 From: Milan Broz User-Agent: Thunderbird 1.5.0.10 (X11/20070302) MIME-Version: 1.0 To: Thomas Meyer CC: "Rafael J. Wysocki" , linux-kernel@vger.kernel.org, Pavel Machek , Thomas Gleixner Subject: Re: SwSusp to disk doesn't work - Try 2 References: <45F44599.3060508@m3y3r.de> <200703112038.52375.rjw@sisk.pl> <45F46530.8050005@redhat.com> <200703112132.32753.rjw@sisk.pl> <45F46660.4010102@m3y3r.de> In-Reply-To: <45F46660.4010102@m3y3r.de> Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Thomas Meyer napsal(a): > Rafael J. Wysocki schrieb: >> On Sunday, 11 March 2007 21:23, Milan Broz wrote: >> >>> Rafael J. Wysocki: >>> >>>> Ah, NO_HZ. Thomas Gleixner's address added to the Cc list. >>>> >>>> >>>>> short printk trace >>>>> >>>>> enable_nonboot_cpus >>>>> _cpu_up >>>>> raw_notifier_callchain (CPU_UP_PREPARE) >>>>> ... >>>>> update_sched_domains >>>>> detach_destroy_domains >>>>> [waits here] --> synchronize_sched (==synchronize_rcu) >>>>> >>>> Well, I think the call to wait_for_completion() does not return, probably >>>> because the task supposed to complete the completion is frozen at this >>>> point. Can you please try to confirm that it gets stuck on >>>> wait_for_completion() in synchronize_rcu()? >>>> >>> Yes, it's in wait_for_completion() in synchronize_rcu(). >>> As noted in some previous mail, it will wake up after >>> event - key press etc. >>> >>> Patch in http://lkml.org/lkml/2007/3/7/255 solves different problem. >>> I added it to my quilt and applied anyway -> no change. >>> >> Does the problem go away if NO_HZ is unset? >> > > i tried to boot with nohz=off, but the problem did persist. Hmmmm, both variants (nohz=off or recompiled kernel without NO_HZ) works for me. Milan