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

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Date:	Mon, 06 Jun 2011 12:26:57 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Arne Jansen <lists@...-jansens.de>
Cc:	Ingo Molnar <mingo@...e.hu>,
	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 Mon, 2011-06-06 at 12:00 +0200, Arne Jansen wrote:
> As expected this apparently fixes the problem. But are we confident
> enough this is the true source? If it's really that simple, printk
> calling into the scheduler, why am I the only one seeing this?

Right, so apparently you have contention on console_sem and the up()
actually does a wakeup. I'm still trying to figure out how to do that.


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