linux-kernel - Re: [PATCH] Fix race between attach_task and cpuset

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Message-ID: <6599ad830704050110w65c2312br3c8d070da5d6dfa5@mail.gmail.com>
Date:	Thu, 5 Apr 2007 01:10:21 -0700
From:	"Paul Menage" <menage@...gle.com>
To:	vatsa@...ibm.com
Cc:	"Paul Jackson" <pj@....com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, "Balbir Singh" <balbir@...ibm.com>
Subject: Re: [PATCH] Fix race between attach_task and cpuset_exit

On 4/5/07, Srivatsa Vaddagiri <vatsa@...ibm.com> wrote:
>
> Hmm yes ..I am surprised we arent doing a synhronize_rcu in
> cpuset_rmdir() before dropping the dentry. Did you want to send a patch
> for that?

Currently cpuset_exit() isn't in a rcu section so it wouldn't help.

But this ceases to be a problem if we don't leave the refcount
dropping in cpuset_exit() where it is currently - it doesn't drop the
refcount until it's holding manage_mutex, at which point it's safe to
hold a cpuset reference with a refcount of 0.

Paul
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