linux-kernel - Re: kernel: smp: WARNING at kernel/smp.c:673

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Date:	Mon, 4 Aug 2014 11:00:44 -0500 (CDT)
From:	Christoph Lameter <cl@...two.org>
To:	Tejun Heo <htejun@...il.com>
cc:	Sasha Levin <sasha.levin@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>, Matt Mackall <mpm@...enic.com>,
	Gilad Ben-Yossef <gilad@...yossef.com>,
	Jens Axboe <axboe@...com>, Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: kernel: smp: WARNING at kernel/smp.c:673

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.

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