linux-kernel - Re: [3.6.6] panic on reboot / khungtaskd blocked? (WARNING: at arch/x86/kernel/smp.c:123 native_smp_send

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Date:	Mon, 12 Nov 2012 11:22:47 +0100
From:	Paweł Sikora <pawel.sikora@...k.net>
To:	Michael Wang <wangyun@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	torvalds@...ux-foundation.org, arekm@...-linux.org,
	baggins@...-linux.org
Subject: Re: [3.6.6] panic on reboot / khungtaskd blocked? (WARNING: at arch/x86/kernel/smp.c:123 native_smp_send_reschedule)

On Monday 12 of November 2012 15:40:31 Michael Wang wrote:
> On 11/12/2012 03:16 PM, Paweł Sikora wrote:
> > On Monday 12 of November 2012 11:04:12 Michael Wang wrote:
> >> On 11/09/2012 09:48 PM, Paweł Sikora wrote:
> >>> Hi,
> >>>
> >>> during playing with new ups i've caught an nice oops on reboot:
> >>>
> >>> http://imgbin.org/index.php?page=image&id=10253
> >>>
> >>> probably the upstream is also affected.
> >>
> >> Hi, Paweł
> >>
> >> Are you using a clean 3.6.6 without any modify?
> > 
> > yes, pure 3.6.6 form git tree with modular config.
> > 
> >> Looks like some threads has set itself to be UNINTERRUPTIBLE with out
> >> any design on switch itself back later(or the time is too long), are you
> >> accidentally using some bad designed module?
> > 
> > hmm, hard to say. mostly all modules are loaded automatically by kernel.
> 
> Could you please provide the whole dmesg in text? your picture lost the
> print info of the hung task.

i've grabbed the console via rs232 but there's no more info (see attached txt).
the dmesg (filesystem) is not synced during panic (leds on keyboard blink, sysrq doesn't work).
how can i grab more info?

View attachment "shutdown.txt" of type "text/plain" (42480 bytes)