Re: Oops after cd /sys/.../cpufreq/; rmmod; cat stats/time_in_state

Alexey Dobriyan
2007-03-20T09:59:37Z

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