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Date: Mon, 4 Aug 2014 11:00:44 -0500 (CDT)
From: Christoph Lameter <cl@gentwo.org>
To: Tejun Heo <htejun@gmail.com>
cc: Sasha Levin <sasha.levin@oracle.com>,
        Andrew Morton <akpm@linux-foundation.org>,
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        David Rientjes <rientjes@google.com>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>
Subject: Re: kernel: smp: WARNING at kernel/smp.c:673
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On Mon, 4 Aug 2014, Tejun Heo wrote:

> > Yuck. I meant cgroup code. There were some patches that were suggesting a
> > shrink operation when taking down a cgroup. Does that also apply to per
> > cpu downing?
>
> Heh, I have no idea what you're talking about.  cgroup currently
> doesn't do anything like that.  It doesn't even make use of the cpu
> hotplug hooks.

Something is running a kmem_cache_shrink from cpu down hooks. Thats weird.