From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner+w=401wt.eu-S1758213AbYA1Le0@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1758213AbYA1Le0 (ORCPT <rfc822;w@1wt.eu>);
	Mon, 28 Jan 2008 06:34:26 -0500
Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750802AbYA1LeT
	(ORCPT <rfc822;linux-kernel-outgoing>);
	Mon, 28 Jan 2008 06:34:19 -0500
Received: from ogre.sisk.pl ([217.79.144.158]:33329 "EHLO ogre.sisk.pl"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S1750798AbYA1LeS (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
	Mon, 28 Jan 2008 06:34:18 -0500
From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Steven Rostedt <srostedt@redhat.com>
Subject: Re: [Regression] 2.6.24-git3: Major annoyance during suspend/hibernation on x86-64 (bisected)
Date: Mon, 28 Jan 2008 12:31:50 +0100
User-Agent: KMail/1.9.6 (enterprise 20070904.708012)
Cc: Ingo Molnar <mingo@elte.hu>, Andrew Morton <akpm@linux-foundation.org>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       LKML <linux-kernel@vger.kernel.org>,
       Dmitry Adamushko <dmitry.adamushko@gmail.com>,
       Peter Zijlstra <a.p.zijlstra@chello.nl>
References: <200801272229.48955.rjw@sisk.pl> <200801280226.22013.rjw@sisk.pl> <479D3287.1050604@redhat.com>
In-Reply-To: <479D3287.1050604@redhat.com>
MIME-Version: 1.0
Content-Type: text/plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
Message-Id: <200801281231.51545.rjw@sisk.pl>
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Monday, 28 of January 2008, Steven Rostedt wrote:
> Rafael J. Wysocki wrote:
> 
> > No, this isn't the WARN_ON().
> > 
> >> this does have the feel of being scheduling related, but are you 
> >> absolutely sure about the precise identity of the patch?
> > 
> > Actually, not quite.  That's why I have verified it and found that another
> > patch is really responsible for the issue, namely:
> > 
> > commit 82a1fcb90287052aabfa235e7ffc693ea003fe69
> > Author: Ingo Molnar <mingo@elte.hu>
> > Date:   Fri Jan 25 21:08:02 2008 +0100
> > 
> >     softlockup: automatically detect hung TASK_UNINTERRUPTIBLE tasks
> 
> Are you getting a bunch of prints from the softlockup detector in dmesg?

No, I don't.  In fact, I don't get _any_ messages from it whatsoever.

> I wonder if the detector can detect a long timeout caused by suspend and 
> resume and if not is triggering false positives?

I'm not sure, but the code is supposed to be suspend-aware, IIRC.  However,
I'm seeing a similar symptom on poweroff on an SMP x86-64 box, so it may be
more directly related to the CPU hotplug.  I'll try to verify that.

Thanks,
Rafael