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

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Date:	Sun, 5 Jun 2011 17:32:18 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Arne Jansen <lists@...-jansens.de>
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


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.

Thanks,

	Ingo
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