netdev - Re: 2.6.35-rc2-git1 - include/linux/cgroup.h:534 invoked rcu_dereference

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Message-ID: <1276107311.1745.66.camel@laptop>
Date:	Wed, 09 Jun 2010 20:15:11 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Miles Lane <miles.lane@...il.com>
Cc:	paulmck@...ux.vnet.ibm.com, Vivek Goyal <vgoyal@...hat.com>,
	Eric Paris <eparis@...hat.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>, nauman@...gle.com,
	eric.dumazet@...il.com, netdev@...r.kernel.org,
	Jens Axboe <jens.axboe@...cle.com>,
	Gui Jianfeng <guijianfeng@...fujitsu.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Johannes Berg <johannes@...solutions.net>
Subject: Re: 2.6.35-rc2-git1 - include/linux/cgroup.h:534 invoked 
 rcu_dereference_check() without protection!

On Wed, 2010-06-09 at 19:57 +0200, Peter Zijlstra wrote:
> +       /*
> +        * We're not in the pid-hash yet so no cgroup attach races, and the
> +        * cgroup is pinned by the parent running this.
> +        *
> +        * Silence PROVE_RCU.
> +        */ 

Hum,.. not sure that's actually true though, the parent itself is still
susceptible to races afaict..
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