linux-kernel - Re: [PATCH for-4.6] cgroup: ignore css_sets associated with dead cgroups during migration

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Message-ID: <20160316202917.GD21104@mtj.duckdns.org>
Date:	Wed, 16 Mar 2016 13:29:17 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Li Zefan <lizefan@...wei.com>,
	Johannes Weiner <hannes@...xchg.org>, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH for-4.6] cgroup: ignore css_sets associated with dead
 cgroups during migration

On Wed, Mar 16, 2016 at 11:45:27AM +0100, Peter Zijlstra wrote:
> This doesn't fix the problem that those zombies might actually still
> want to use the cgroups they're tied to, as reported here:
> 
>   lkml.kernel.org/r/20160314112057.GT6356@...ns.programming.kicks-ass.net
> 
> I would strongly suggest to revert 2e91fa7f6d45 wholesale (and mark for
> stable) and try again later.

For the record, this issue was caused by the cpu controller taking
down its css too early during destruction at ->css_offline() and is
fixed by switching to ->css_released() instead.

Thanks.

-- 
tejun