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

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Message-ID: <CAKohponzmLzPN8ua3p4TCt2waZCQCd+4Znh+tSQ4MBjcy+Ss6A@mail.gmail.com>
Date:	Tue, 9 Apr 2013 22:21:09 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	sedat.dilek@...il.com
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 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().
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