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

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Message-ID: <20120106141915.GA21150@redhat.com>
Date:	Fri, 6 Jan 2012 15:19:15 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Yasunori Goto <y-goto@...fujitsu.com>, Ingo Molnar <mingo@...e.hu>,
	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 01/06, Oleg Nesterov wrote:
>
> But this makes me worry. We are doing a lot of things after
> exit_mm(). In particular we take tasklist_lock in exit_notify()
> and then do_exit() takes task_lock(). But every unlock + lock
> implies mb(). So how it was possible to hit this bug???

Damn. please ignore me.

Somehow I forgot that _there is no_ spin_unlock_wait() in the
current code ;)

Oleg.

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