linux-kernel - Re: Oops after cd /sys/.../cpufreq/; rmmod; cat stats/time_in

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Message-ID: <20070322030753.GB5728@suse.de>
Date:	Wed, 21 Mar 2007 20:07:53 -0700
From:	Greg KH <gregkh@...e.de>
To:	Alexey Dobriyan <adobriyan@...ru>
Cc:	linux-kernel@...r.kernel.org, davej@...emonkey.org.uk,
	akpm@...l.org
Subject: Re: Oops after cd /sys/.../cpufreq/; rmmod; cat stats/time_in_state

On Tue, Mar 20, 2007 at 01:06:34PM +0300, Alexey Dobriyan wrote:
> On Mon, Mar 19, 2007 at 01:41:25PM -0700, Greg KH wrote:
> > On Mon, Mar 19, 2007 at 06:30:13PM +0300, Alexey Dobriyan wrote:
> > > Steps to reproduce:
> > >
> > > 	# modprobe p4-clockmod
> > > 	$ cd /sys/devices/system/cpu/cpu0/cpufreq/
> > > 	# rmmod p4-clockmod
> > > 	$ cat stats/time_in_state
> > > 	Segmentation fault
> >
> > Has this always happened?  Or is it new?
> 
> I've checked 2.6.17 and up and it happens too.
> 
> Some .config peculiarities:
> 
> 	CONFIG_CPU_FREQ=y
> 	CONFIG_CPU_FREQ_STAT=y
> 	CONFIG_X86_P4_CLOCKMOD=m
> 
> After modprobe/rmmod cpufreq/stats directory appears but doesn't get
> removed. Should it?

Yes.

Well, one can argue that those stats should never be in sysfs at all
anyway, I mean come on, a histogram in sysfs?  That's, not ok.

thanks,

greg k-h
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