linux-kernel - Re: cpu hotplug support broken in 2.6.23-rc3

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Message-ID: <20070827215822.GH3398@elf.ucw.cz>
Date:	Mon, 27 Aug 2007 23:58:23 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Jeff Chua <jeff.chua.linux@...il.com>, rusty@...tycorp.com.au,
	vatsa@...ibm.com, zwane@....linux.org.uk,
	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: cpu hotplug support broken in 2.6.23-rc3

On Mon 2007-08-27 23:59:31, Rafael J. Wysocki wrote:
> On Monday, 27 August 2007 23:32, Pavel Machek wrote:
> > On Mon 2007-08-27 22:36:57, Jeff Chua wrote:
> > > On 8/27/07, Pavel Machek <pavel@....cz> wrote:
> > > > On Mon 2007-08-27 12:43:50, Pavel Machek wrote:
> > > > > Hi!
> > > > >
> > > > > Trying to do few onlines/offlines reliably hangs my machine (thinkpad
> > > > > x60, i386 architecture).
> > > 
> > > I just 3 cycles of on-line/off-line on 2.6.23-rc3 on ThinkPad x60s,
> > > and my system still survives.
> > 
> > Can you try 20-or-so tests? Mine hangs randomly, so it survived 4 or
> > so cycles at one point.
> > 
> > ...or maybe difference is in the .config, or maybe I broken something
> > in my kernel sources....
> 
> Well, something seems to be wrong with the CPU hotplug, but it's insanely
> difficult to reproduce on my boxes.
> 
> I bet on one of the notifiers blocking while waiting on a frozen task.

It happens reliably for me, with this script... and randomly, when I
just echo 0/1 > online from commandline... so it should not be
anything with the frozen tasks.

echo test > /sys/power/disk
echo disk > /sys/power/state

reliably hangs on resume in the attached script. It works ok with
nosmp.

								Pavel

#!/bin/bash
killall klogd

echo -n "testing refrigerator (testproc)..."
echo testproc > /sys/power/disk
echo disk > /sys/power/state
echo "okay"

sleep 2
echo -n "testing drivers (test)..."
echo test > /sys/power/disk
echo disk > /sys/power/state
echo "okay"

sleep 2
echo -n "testing swsusp (reboot)..."
echo reboot > /sys/power/disk
echo disk > /sys/power/state
echo "okay"

sleep 2
echo -n "testing s2ram..."
s2ram
echo "okay"

sleep 2
echo -n "testing swsusp (shutdown)..."
echo shutdown > /sys/power/disk
echo disk > /sys/power/state
echo "okay"

sleep 2
echo -n "testing swsusp (platform)..."
echo platform > /sys/power/disk
echo disk > /sys/power/state
echo "okay"

sleep 2
echo -n "testing s2ram..."
s2ram
echo "okay"
 

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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