linux-kernel - Re: [PATCHv9 1/3] rdmacg: Added rdma cgroup controller

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Date:	Thu, 3 Mar 2016 10:14:53 +0200
From:	Haggai Eran <haggaie@...lanox.com>
To:	Parav Pandit <pandit.parav@...il.com>, Tejun Heo <tj@...nel.org>
CC:	<cgroups@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
	<lizefan@...wei.com>, Johannes Weiner <hannes@...xchg.org>,
	Doug Ledford <dledford@...hat.com>,
	Liran Liss <liranl@...lanox.com>,
	"Hefty, Sean" <sean.hefty@...el.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Jonathan Corbet <corbet@....net>, <james.l.morris@...cle.com>,
	<serge@...lyn.com>, Or Gerlitz <ogerlitz@...lanox.com>,
	Matan Barak <matanb@...lanox.com>, <raindel@...lanox.com>,
	<akpm@...ux-foundation.org>,
	<linux-security-module@...r.kernel.org>
Subject: Re: [PATCHv9 1/3] rdmacg: Added rdma cgroup controller

On 03/03/2016 05:18, Parav Pandit wrote:
> On Thu, Mar 3, 2016 at 1:28 AM, Parav Pandit <pandit.parav@...il.com> wrote:
>> On Wed, Mar 2, 2016 at 11:09 PM, Tejun Heo <tj@...nel.org> wrote:
>>> Nothing seems to prevent @cg from going away if this races with
>>> @current being migrated to a different cgroup.  Have you run this with
>>> lockdep and rcu debugging enabled?  This should have triggered a
>>> warning.
> I am able to reproduce this race. Looking into how to address it.

If I understand correctly, task_css() requires rcu read lock being held.
Is task_get_css() suitable here?