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

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Message-ID: <alpine.DEB.2.00.1201191959540.14480@router.home>
Date:	Thu, 19 Jan 2012 20:03:51 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Sasha Levin <levinsasha928@...il.com>,
	Dave Jones <davej@...hat.com>, davem <davem@...emloft.net>,
	Pekka Enberg <penberg@...nel.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

On Thu, 19 Jan 2012, Eric W. Biederman wrote:

> Oh.  I see.  The problem is calling kobject_uevent (which happens to
> live in slabs sysfs_slab_add) with a lock held.  And kobject_uevent
> makes a blocking call to userspace.
>
> No locks held seems to be a good policy on that one.

Well we can just remove that call to kobject_uevent instead then. Does it
do anything useful? Cannot remember why we put that in there.

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