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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