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SubjectRe: Linux 3.4 released
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@web.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

>
> --
> Best regards,
> J?rg-Volker.
>
>
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