linux-kernel - Re: Linux 3.4 released

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Message-ID: <4FBBEDF2.8060803@web.de>
Date:	Tue, 22 May 2012 21:50:10 +0200
From:	Jörg-Volker Peetz <jvpeetz@....de>
To:	Tejun Heo <tj@...nel.org>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Linux 3.4 released

Tejun Heo wrote, on 05/22/12 20:35:
> Hello,
> 
> On Tue, May 22, 2012 at 11:26 AM, Jörg-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?

-- 
Best regards,
Jörg-Volker.

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