linux-kernel - Re: [BUG] Something goes wrong with timer statistics.

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Message-ID: <20070530065204.GA2226@atjola.homenet>
Date:	Wed, 30 May 2007 08:52:04 +0200
From:	Björn Steinbrink <B.Steinbrink@....de>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Michal Piotrowski <michal.k.k.piotrowski@...il.com>,
	Ian Kumlien <iank@...dband.net>, Linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [BUG] Something goes wrong with timer statistics.

On 2007.05.30 00:38:08 +0200, Thomas Gleixner wrote:
> On Wed, 2007-05-30 at 00:24 +0200, Michal Piotrowski wrote:
> > Hi Ian,
> > 
> > (Thomas "The Wizard of Time" added to CC :))
> 
> Added more wizards :)
> 
> > On 29/05/07, Ian Kumlien <iank@...dband.net> wrote:
> > > Hi,
> > >
> > > As the daystar sets, i try to play some with my new would be
> > > firewall/server, but since this will be running for quite some time i
> > > have been experimenting with powertop to find out what i can do to limit
> > > it's power usage.
> > >
> > > But, if i run powertop for too long or a few times to many... this
> > > happens:
> > > http://pomac.netswarm.net/pics/kernel_panic.jpg
> 
> This was reported before. It's incredibly hard to reproduce.

Hm, tstats_write() only grabs show_mutex, but it calls reset_entries()
which happily messes with the entries table, shouldn't the table_lock
also be held in that case?

Björn
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