netdev - Re: Hung task when calling clone() due to netfilter/slab

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Message-ID: <1326561533.5287.26.camel@edumazet-laptop>
Date:	Sat, 14 Jan 2012 18:18:53 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Sasha Levin <levinsasha928@...il.com>
Cc:	Dave Jones <davej@...hat.com>, davem <davem@...emloft.net>,
	Pekka Enberg <penberg@...nel.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Matt Mackall <mpm@...enic.com>, kaber@...sh.net,
	pablo@...filter.org, linux-kernel <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, netfilter-devel@...r.kernel.org,
	netdev <netdev@...r.kernel.org>
Subject: Re: Hung task when calling clone() due to netfilter/slab

Le samedi 14 janvier 2012 à 18:10 +0100, Eric Dumazet a écrit :

> Apparently SLUB calls sysfs_slab_add() from kmem_cache_create() while
> still holding slub_lock.
> 
> So if the task launched needs to "cat /proc/slabinfo" or anything
> needing slub_lock, its a deadlock.
> 
> 

Bug added in commit 2bce64858442149784f6c88
(slub: Allow removal of slab caches during boot)



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