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

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Message-ID: <CA+icZUUEExm5Mktxoj6=UdzBe5HUzskktKWdHNOKaFXVHaySBg@mail.gmail.com>
Date:	Wed, 10 Apr 2013 07:53:32 +0200
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	cpufreq@...r.kernel.org, Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: linux-next: Tree for Apr 9 [cpufreq: NULL pointer deref]

On Wed, Apr 10, 2013 at 7:41 AM, Sedat Dilek <sedat.dilek@...il.com> wrote:
> On Tue, Apr 9, 2013 at 6:51 PM, Viresh Kumar <viresh.kumar@...aro.org> wrote:
>> On 9 April 2013 21:38, Sedat Dilek <sedat.dilek@...il.com> 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 -

Hmm, I see that the kernel-sources itself ships a...

./tools/power/cpupower/utils/cpufreq-info.c

IIRC current 'make deb-pkg' does not build the tools, but I have seen
a patch on linux-kbuild ML.
Can I build cpufreq-info.c afterwards? Do I need a already-compiled build-dir?

Thanks in advance for answering my questions.

BTW, I have found a nice article on LWN "cpupowerutils - cpufrequtils
extended with quite some features" (see [1]).

- Sedat -

[1] http://lwn.net/Articles/433002/
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