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

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Message-ID: <20070320100634.GA6811@localhost.sw.ru>
Date:	Tue, 20 Mar 2007 13:06:34 +0300
From:	Alexey Dobriyan <adobriyan@...ru>
To:	Greg KH <gregkh@...e.de>
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 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?

/sys/devices/system/cpu/cpu0/cpufreq $ ls -lR
.:
total 0
drwxr-xr-x 2 root root 0 2007-03-20 12:59 stats

./stats:
total 0
-r--r--r-- 1 root root 4096 2007-03-20 12:59 time_in_state
-r--r--r-- 1 root root 4096 2007-03-20 12:59 total_trans

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