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

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Message-ID: <CA+icZUVDp9N1A1OQf_e=+NsoikMUodNa_FjYKOEzJvUCVB+cRA@mail.gmail.com>
Date:	Tue, 9 Apr 2013 20:29:51 +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 Tue, Apr 9, 2013 at 8:26 PM, 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?
>>
>> I am not able to find next-20130326 tag in my repo, only have 23 and 28.
>> Can you debug it a bit to find exact line of code causing this issue using
>> objdump?
>>
>> HINT: Documentation/BUG-HUNTING..
>>
>> Give me line numbers of both of these functions: __cpufreq_governor() and
>> __cpufreq_remove_dev().
>
> I have recompiled next-20130326 and the REGRESSION is still reproducible.
>
> Attached are my dmesg, kernel-config, tarball of my drivers/cpufreq
> build-dir, objdump of cpufreq_governor.o and the list of my current
> amd64-toolchain.
>
> Hope this helps you!
>
> Regards,
> - Sedat -

$ cd linux-next/

$ objdump --disassemble-all drivers/cpufreq/cpufreq.o >
/tmp/cpufreq_o--disassemble-all.txt

...attached.

- Sedat -

View attachment "cpufreq_o--disassemble-all.txt" of type "text/plain" (191631 bytes)