linux-kernel - Re: [tip:sched/urgent] sched/cgroup: Fix/cleanup cgroup teardown/init

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Date:	Sun, 1 May 2016 20:06:50 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...nel.org,
	tj@...nel.org, hpa@...or.com, k@....jp, niklas.cassel@...s.com,
	torvalds@...ux-foundation.org, linux-tip-commits@...r.kernel.org,
	mjg59@...eos.com
Subject: Re: [tip:sched/urgent] sched/cgroup: Fix/cleanup cgroup teardown/init

On Thu, Apr 28, 2016 at 11:36:09PM +0200, Peter Zijlstra wrote:
> On Thu, Apr 28, 2016 at 11:51:37AM -0700, Greg Kroah-Hartman wrote:
> > On Thu, Apr 28, 2016 at 08:40:32PM +0200, Peter Zijlstra wrote:
> > > 
> > > Greg,
> > > 
> > > It looks like the below patch missed 4.5 and I'm starting to get bug
> > > reports that look very much like this issue, could we get this patch
> > > lifted into 4.5-stable?
> > 
> > Sure, also added to 4.4-stable as that is where the bug for this was
> > fixed, according to the commit message.
> 
> I think this patch relies on the following two cgroup patches:
> 
> 8bb5ef79bc0f ("cgroup: make sure a parent css isn't freed before its children")

This was missing.

> aa226ff4a1ce ("cgroup: make sure a parent css isn't offlined before its children")

This was already in 4.4-stable, thanks for letting me know.

greg k-h