linux-kernel - Re: mm: slub: circular dependency between slab_mutex and cpu

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Message-ID: <alpine.DEB.2.11.1408281030510.6401@gentwo.org>
Date:	Thu, 28 Aug 2014 10:31:26 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Sasha Levin <sasha.levin@...cle.com>
cc:	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"davej @gmail-imap.l.google.com>> Dave Jones" <davej@...hat.com>
Subject: Re: mm: slub: circular dependency between slab_mutex and
 cpu_hotplug

On Thu, 28 Aug 2014, Sasha Levin wrote:

> While fuzzing with trinity inside a KVM tools guest running the latest -next
> kernel, I've stumbled on the following spew:

This looks to me more to be a cpu hotplug issue.
>
> [ 7841.323177]  Possible unsafe locking scenario:
> [ 7841.323177]
> [ 7841.323177]        CPU0                    CPU1
> [ 7841.323177]        ----                    ----
> [ 7841.323177]   lock(cpu_hotplug.lock#2);
> [ 7841.323177]                                lock((oom_notify_list).rwsem);
> [ 7841.323177]                                lock(cpu_hotplug.lock#2);
> [ 7841.323177]   lock(slab_mutex);
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