From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tejun Heo <tj@kernel.org>
Subject: Re: Cgroup v2 bug: "domain invalid" node can't be converted to
 "threaded"
Date: Thu, 4 Oct 2018 13:29:47 -0700
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To: "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>
Cc: lkml <linux-kernel@vger.kernel.org>, "open list:CONTROL GROUP (CGROUP)" <cgroups@vger.kernel.org>, "Serge E. Hallyn" <serge@hallyn.com>, Amin Jamali <ajamali@pivotal.io>, Joao De Almeida Pereira <jpereira@pivotal.io>

On Thu, Oct 04, 2018 at 11:20:17AM -0700, Tejun Heo wrote:
> Subject: cgroup: Fix dom_cgrp propagation when enabling threaded mode
> 
> A cgroup which is already a threaded domain may be converted into a
> threaded cgroup if the prerequisite conditions are met.  When this
> happens, all threaded descendant should also have their ->dom_cgrp
> updated to the new threaded domain cgroup.  Unfortunately, this
> propagation was missing leading to the following failure.

Applied to cgroup/for-4.19-fixes w/ reported-bys added.

Thanks.

-- 
tejun