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

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Date:	Tue, 9 Apr 2013 20:26:55 +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 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 -

View attachment "dmesg_3.9.0-rc4-next20130326-1-iniza-small_broken.txt" of type "text/plain" (57886 bytes)

Download attachment "config-3.9.0-rc4-next20130326-1-iniza-small" of type "application/octet-stream" (111656 bytes)

Download attachment "drivers-cpufreq_from-dileks.tar.xz" of type "application/octet-stream" (169064 bytes)

Download attachment "drivers-cpufreq_from-dileks.tar.xz.sha256sum" of type "application/octet-stream" (101 bytes)

View attachment "HOST-AND-BUILD-TOOLCHAIN_from-dileks.txt" of type "text/plain" (3035 bytes)

View attachment "cpufreq_governor_o--disassemble-all.txt" of type "text/plain" (41895 bytes)