linux-kernel - Re: oom: __task_cred() need rcu_read

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Message-ID: <7682.1282230394@redhat.com>
Date:	Thu, 19 Aug 2010 16:06:34 +0100
From:	David Howells <dhowells@...hat.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	dhowells@...hat.com,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: oom: __task_cred() need rcu_read_lock()

KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:

> dump_tasks() can call __task_cred() safely because we are holding
> tasklist_lock. but rcu lock validator don't have enough knowledge and
> it makes following annoying warning.

No, it can't.  The tasklist_lock is not protection against the creds changing
on another CPU.

David
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