linux-kernel - Re: Cgroup v2 bug: "domain invalid" node can't be converted to "threaded"

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Message-ID: <20181004202947.GL270328@devbig004.ftw2.facebook.com>
Date:   Thu, 4 Oct 2018 13:29:47 -0700
From:   Tejun Heo <tj@...nel.org>
To:     "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        "open list:CONTROL GROUP (CGROUP)" <cgroups@...r.kernel.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Amin Jamali <ajamali@...otal.io>,
        Joao De Almeida Pereira <jpereira@...otal.io>
Subject: Re: Cgroup v2 bug: "domain invalid" node can't be converted to
 "threaded"

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