linux-kernel - Re: [BUG] TASK_DEAD task is able to be woken up in special condition

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Date:	Tue, 24 Jan 2012 11:11:25 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Yasunori Goto <y-goto@...fujitsu.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Hiroyuki KAMEZAWA <kamezawa.hiroyu@...fujitsu.com>,
	Motohiro Kosaki <kosaki.motohiro@...fujitsu.com>,
	Linux Kernel ML <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] TASK_DEAD task is able to be woken up in special
 condition

On Wed, 2012-01-18 at 10:42 +0100, Ingo Molnar wrote:
> Well, but does the -rt kernel suffer from the same race? 

Yes it does

> It can 
> generate delays at the exact same place, and can generate much 
> longer delays than an SMI, if a high-prio RT task comes along.
> 
No it can't, since do_exit() plays silly games with preempt_disable().

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