Re: linux-next: Tree for Apr 9 [cpufreq: NULL pointer deref]

[Sedat Dilek]

On Tue, Apr 9, 2013 at 6:51 PM, Viresh Kumar <viresh.kumar@xxxxxxxxxx> wrote:
> On 9 April 2013 21:38, Sedat Dilek <sedat.dilek@xxxxxxxxx> wrote:
>> With x=3 the system gets in an unuseable state.
>>
>>      root# echo 0 > /sys/devices/system/cpu/cpu3/online
>>
>> I could not write my reply and had to do a hard/cold reboot.
>> The dmesg log I saw looked similiar to my digicam-shot.
>
> Few things i need from you. First is output of cpufreq-info. Then
> all the steps you did to reproduce above? Removed any other cpus?
>

Here is the output of cpufreq-info of the stable distro-kernel I am using.
If you need the one from the "BROKEN" kernel, please let me know.

- Sedat -
cpufrequtils 007: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to cpufreq@xxxxxxxxxxxxxxx, please.
analyzing CPU 0:
  driver: acpi-cpufreq
  CPUs which run at the same hardware frequency: 0 1 2 3
  CPUs which need to have their frequency coordinated by software: 0
  maximum transition latency: 10.0 us.
  hardware limits: 800 MHz - 1.60 GHz
  available frequency steps: 1.60 GHz, 1.60 GHz, 1.50 GHz, 1.40 GHz, 1.30 GHz, 1.20 GHz, 1.10 GHz, 1000 MHz, 900 MHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 800 MHz and 1.60 GHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency is 1.60 GHz (asserted by call to hardware).
  cpufreq stats: 1.60 GHz:18.87%, 1.60 GHz:0.89%, 1.50 GHz:0.45%, 1.40 GHz:0.89%, 1.30 GHz:1.15%, 1.20 GHz:1.75%, 1.10 GHz:1.83%, 1000 MHz:1.91%, 900 MHz:0.92%, 800 MHz:71.34%  (6355)
analyzing CPU 1:
  driver: acpi-cpufreq
  CPUs which run at the same hardware frequency: 0 1 2 3
  CPUs which need to have their frequency coordinated by software: 1
  maximum transition latency: 10.0 us.
  hardware limits: 800 MHz - 1.60 GHz
  available frequency steps: 1.60 GHz, 1.60 GHz, 1.50 GHz, 1.40 GHz, 1.30 GHz, 1.20 GHz, 1.10 GHz, 1000 MHz, 900 MHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 800 MHz and 1.60 GHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency is 1.60 GHz (asserted by call to hardware).
  cpufreq stats: 1.60 GHz:18.68%, 1.60 GHz:3.85%, 1.50 GHz:0.35%, 1.40 GHz:0.52%, 1.30 GHz:0.74%, 1.20 GHz:0.72%, 1.10 GHz:0.77%, 1000 MHz:1.02%, 900 MHz:0.44%, 800 MHz:72.91%  (3815)
analyzing CPU 2:
  driver: acpi-cpufreq
  CPUs which run at the same hardware frequency: 0 1 2 3
  CPUs which need to have their frequency coordinated by software: 2
  maximum transition latency: 10.0 us.
  hardware limits: 800 MHz - 1.60 GHz
  available frequency steps: 1.60 GHz, 1.60 GHz, 1.50 GHz, 1.40 GHz, 1.30 GHz, 1.20 GHz, 1.10 GHz, 1000 MHz, 900 MHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 800 MHz and 1.60 GHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency is 1.60 GHz (asserted by call to hardware).
  cpufreq stats: 1.60 GHz:21.21%, 1.60 GHz:0.26%, 1.50 GHz:0.34%, 1.40 GHz:0.48%, 1.30 GHz:0.59%, 1.20 GHz:0.73%, 1.10 GHz:0.75%, 1000 MHz:1.16%, 900 MHz:0.56%, 800 MHz:73.91%  (4108)
analyzing CPU 3:
  driver: acpi-cpufreq
  CPUs which run at the same hardware frequency: 0 1 2 3
  CPUs which need to have their frequency coordinated by software: 3
  maximum transition latency: 10.0 us.
  hardware limits: 800 MHz - 1.60 GHz
  available frequency steps: 1.60 GHz, 1.60 GHz, 1.50 GHz, 1.40 GHz, 1.30 GHz, 1.20 GHz, 1.10 GHz, 1000 MHz, 900 MHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 800 MHz and 1.60 GHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency is 800 MHz (asserted by call to hardware).
  cpufreq stats: 1.60 GHz:16.28%, 1.60 GHz:0.28%, 1.50 GHz:0.22%, 1.40 GHz:0.30%, 1.30 GHz:0.43%, 1.20 GHz:0.69%, 1.10 GHz:0.79%, 1000 MHz:1.17%, 900 MHz:0.62%, 800 MHz:79.22%  (2995)