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

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Date:	Mon, 3 Sep 2007 12:19:12 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Pavel Machek <pavel@....cz>
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>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: cpu hotplug support broken in 2.6.23-rc3

On Monday, 3 September 2007 05:47, Pavel Machek wrote:
> Hi!
> 
> > > Can you try 20-or-so tests? Mine hangs randomly, so it survived 4 or
> > > so cycles at one point.
> > 
> > Mine still survives with this ... with sleep 1 ...
> > 
> > # for((i=0; i<100; i++)); do echo $i; echo $((i % 2))
> > >/sys/devices/system/cpu/cpu1/online; sleep 1; done
> > 
> > and this as well ... without sleep ...
> > 
> > # for((i=0; i<100; i++)); do echo $i; echo $((i % 2))
> > >/sys/devices/system/cpu/cpu1/online; done
> > 
> > I'm on reiserfs. gcc 3.4.5. Config sent to you seperately so as not to
> > cloud lkml. If anyone wants the config, please let me know. Is mime
> > "attachment" acceptable now on lkml?
> 
> Ok, so it gets weirder. I have now machine in "hung" state; other
> consoles still work, but there are no timers -  sleep 1 hangs forever.
> 
> sysrq-t shows kstopmachine hung in hrtimer_try_to_cancel.
> 
> So I indeed suspect difference-in-kconfig to trigger this, and will
> try disabling noidlehz.

I would unset CONFIG_HIGH_RES_TIMERS for starters.

Well, I guess Thomas should know about that. ;-)

Greetings,
Rafael
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