linux-kernel - Re: Linux 3.4 released

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Date:	Wed, 23 May 2012 14:33:04 +0200
From:	Jörg-Volker Peetz <jvpeetz@....de>
To:	Yong Zhang <yong.zhang0@...il.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Linux 3.4 released

Yong Zhang wrote, on 05/23/12 08:34:
> On Tue, May 22, 2012 at 09:50:10PM +0200, J�rg-Volker Peetz wrote:
>> Tejun Heo wrote, on 05/22/12 20:35:
>>> Hello,
>>>
>>> On Tue, May 22, 2012 at 11:26 AM, J?rg-Volker Peetz <jvpeetz@....de> wrote:
>>>> Also with this second patch I wasn't able to see any output beginning with "XXX
>>>> delayed_work_timer_fn:". It should appear in the system log or on the text-console?
>>>
>>> Hmmm... it should appear on the console but your printk setting might
>>> be different. Can you please prepend KERN_CRIT before the printk
>>> format string? So that it looks like printk(KERN_CRIT "XXX: ...").
>>>
>>> Thanks.
>>>
>>
>> Hello,
>>
>> no, changing to  printk(KERN_CRIT "XXX: ...", ...)  in kernel/workqueue.c didn't
>> print anything I could read. Would it appear before the "panic screen"? But I'm
>> not able to scroll back.
>> The Panic screen starts with
>>
>> BUG: Unable to handle kernel NULL pointer dereference at 0000000000000008
>> IP: [<ffffffff8103eef1>] delayed_work_timer_fn+0x13/0x70
>>
>> and the Call Trace with
>>
>> Call Trace:
>>  <IRQ>
>>  [<ffffffff81056fbf>] ? ktime_get+0x5f/0xf0
>>  [<ffffffff810342c6>] ? run_timer_softirq+0x106/0x220
>>  [<ffffffff8105cc44>] ? tick_handle_oneshot_broadcast+0xc4/0xe0
>>
>> Do I need special settings in the kernel config?
> 
> Maybe you can enable CONFIG_DEBUG_OBJECTS_WORK and give another try.
> 
> Thanks,
> Yong
> 

Hello,

with the patch of Tejun Heo and CONFIG_DEBUG_OBJECTS_WORK enabled via "make
nconfig" doesn't show any output line beginning with "XXX".

-- 
Best regards,
Jörg-Volker.

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