linux-kernel - Re: 2.6.18 Nasty Lockup

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Message-Id: <1159384500.29040.3.camel@localhost>
Date:	Wed, 27 Sep 2006 12:14:59 -0700
From:	john stultz <johnstul@...ibm.com>
To:	caglar@...dus.org.tr
Cc:	Greg Schafer <gschafer@....com.au>, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@....de>
Subject: Re: 2.6.18 Nasty Lockup

On Wed, 2006-09-27 at 12:45 +0300, S.Çağlar Onur wrote:
> 27 Eyl 2006 Çar 01:50 tarihinde, john stultz şunları yazmıştı: 
> > On Wed, 2006-09-27 at 00:15 +0300, S.Çağlar Onur wrote:
> > > 26 Eyl 2006 Sal 15:36 tarihinde, Greg Schafer şunları yazmıştı:
> > > > This is a _hard_ lockup. No oops, no magic sysrq, no nuthin, just a
> > > > completely dead machine with only option the reset button. Usually
> > > > happens within a couple of minutes of desktop use but is 100%
> > > > reproducible. Problem is still there in a fresh checkout of current
> > > > Linus git tree (post 2.6.18).
> > >
> > > Same symptoms here and its reproducible after starting the irqbalance
> > > (0.12 or 0.13), if i disable irqbalance then everything is going fine.
> >
> > Hmm.. Not sure about the connection to irqbalance. You're using the TSC
> > clocksource, so I'm curious if your cpu TSC's are out of sync. Can you
> > boot w/ "clocksource=acpi_pm" to see if that resolves it?
> 
> Yep, it solves the problem and system boot normally with irqbalance enabled.

Ok. Good to hear you have a workaround. Now to sort out why your TSCs
are becoming un-synced. From the dmesg you sent me privately, I noticed
that while you have 4 cpus, the following message only shows up once:

ACPI: Processor [CPU1] (supports 8 throttling states)

Does disabling cpufreq change anything?

thanks
-john


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