From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sedat Dilek <sedat.dilek@gmail.com>
Subject: Re: linux-next: Tree for Apr 9 [cpufreq: NULL pointer deref]
Date: Tue, 9 Apr 2013 18:08:46 +0200
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To: Viresh Kumar <viresh.kumar@linaro.org>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>, Stephen Rothwell <sfr@canb.auug.org.au>, linux-next@vger.kernel.org, linux-kernel@vger.kernel.org, cpufreq@vger.kernel.org, Linux PM list <linux-pm@vger.kernel.org>
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On Tue, Apr 9, 2013 at 4:56 PM, Viresh Kumar <viresh.kumar@linaro.org> wrote:
> On 9 April 2013 19:34, Sedat Dilek <sedat.dilek@gmail.com> wrote:
>> I have seen it on reboots.
>> How to online/offline from sysfs?
>
> offline a cpu "x" with:
>
> echo 0 > /sys/devices/system/cpu/cpux/online
>
> and online with echo 1 > to same location.

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.

- Sedat -