linux-kernel - Re: [debug patch] printk: Add a printk killswitch to robustify NMI watchdog messages

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Message-ID: <4DEBB05C.8090506@die-jansens.de>
Date:	Sun, 05 Jun 2011 18:35:40 +0200
From:	Arne Jansen <lists@...-jansens.de>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	efault@....de, npiggin@...nel.dk, akpm@...ux-foundation.org,
	frank.rowand@...sony.com, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [debug patch] printk: Add a printk killswitch to robustify NMI
 watchdog messages

On 05.06.2011 18:07, Arne Jansen wrote:
> On 05.06.2011 17:32, Ingo Molnar wrote:
>>
>> one more thing, could you please add this call:
>>
>> debug_show_all_locks();
>>
>> to after the WARN(), in watchdog.c?
>>
>> Please surround the whole printout portion by the
>> spin_lock()/unlock() protection code i suggested, full-lock-state
>> printouts are slow and other CPUs might start printing their NMI
>> ticks ...
>>
>> With the all-locks-printed output we can double check what locks are
>> held.
>
> Hm, on first try:
>
> INFO: lockdep is turned off.
>
> Recompiling...
>

same after a full recompile.

# grep LOCKDEP .config

CONFIG_LOCKDEP_SUPPORT=y
CONFIG_LOCKDEP=y
# CONFIG_DEBUG_LOCKDEP is not set


-Arne

>>
>> Thanks,
>>
>> Ingo
>> --
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