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From: Christoph Lameter <cl@linux.com>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Sasha Levin <levinsasha928@gmail.com>,
	Dave Jones <davej@redhat.com>, davem <davem@davemloft.net>,
	Pekka Enberg <penberg@kernel.org>, Matt Mackall <mpm@selenic.com>,
	kaber@trash.net, pablo@netfilter.org,
	linux-kernel <linux-kernel@vger.kernel.org>,
	linux-mm <linux-mm@kvack.org>,
	netfilter-devel@vger.kernel.org, netdev <netdev@vger.kernel.org>
Subject: Re: Hung task when calling clone() due to netfilter/slab
Date: Tue, 17 Jan 2012 10:04:38 -0600 (CST)	[thread overview]
Message-ID: <alpine.DEB.2.00.1201170942240.4800@router.home> (raw)
In-Reply-To: <1326814208.2259.21.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC>

On Tue, 17 Jan 2012, Eric Dumazet wrote:

> Thanks !
>
> Acked-by: Eric Dumazet <eric.dumazet@gmail.com>

That may not be the end of it. Slub also calls sysfs from sysfs_add_alias
while holding slub_lock.

If sysfs allows user space stuff to run then you cannot really hold any
locks. How is one supposed to sync adding pointers to sysfs structures in
subsystems? Drop all locks and then recheck the memory structures after
the sysfs function returns? Awkward.



  reply	other threads:[~2012-01-17 16:04 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-01-14 16:30 Hung task when calling clone() due to netfilter/slab Sasha Levin
2012-01-14 17:10 ` Eric Dumazet
2012-01-14 17:18   ` Eric Dumazet
2012-01-15 12:59   ` Sasha Levin
2012-01-15 17:25     ` Eric Dumazet
2012-01-17 15:12       ` Christoph Lameter
2012-01-17 15:20         ` Eric Dumazet
2012-01-17 15:27           ` Christoph Lameter
2012-01-17 15:30             ` Eric Dumazet
2012-01-17 16:04               ` Christoph Lameter [this message]
2012-01-17 22:22                 ` Christoph Lameter
2012-01-19 21:43                   ` Eric W. Biederman
2012-01-19 22:15                     ` Eric W. Biederman
2012-01-20  2:03                       ` Christoph Lameter
2012-01-20  2:31                         ` Eric W. Biederman
2012-01-20 14:49                           ` Christoph Lameter
2012-01-20 20:40                             ` Eric W. Biederman
2012-02-01  8:05                             ` Pekka Enberg
2012-02-01 17:32                               ` Eric W. Biederman
2012-02-01  8:07               ` Pekka Enberg

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