linux-kernel - Re: [2.6.34-rc1] CPU stalls when closing TCP sockets.

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Message-Id: <20100310.073328.141230852.davem@davemloft.net>
Date:	Wed, 10 Mar 2010 07:33:28 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	penguin-kernel@...ove.SAKURA.ne.jp, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, paulmck@...ux.vnet.ibm.com,
	shemminger@...tta.com
Subject: Re: [2.6.34-rc1] CPU stalls when closing TCP sockets.

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Tue, 09 Mar 2010 16:55:56 +0100

> Le mardi 09 mars 2010 à 15:54 +0900, Tetsuo Handa a écrit :
>> Eric Dumazet wrote:
>> > Nothing comes to my mind, I'll try to reproduce this here.
>> 
>> When stopped at (8), Ctrl-C doesn't work.
>> 
>> > Is 2.6.33 OK ?
>> 
>> Yes. 2.6.33 and earlier are OK.
> 
> OK thanks !
> 
> I believe commit d218d11133d888f9745802146a50255a4781d37a
> (tcp: Generalized TTL Security Mechanism) might be the bug origin.
> 
> I am testing following patch, based on latest net-2.6 tree (including
> the LINUX_MIB_TCPMINTTLDROP bit)
> 
> [PATCH] tcp: Fix tcp_v4_rcv()
> 
> Commit d218d111 (tcp: Generalized TTL Security Mechanism) added a bug
> for TIMEWAIT sockets. We should not test min_ttl for TW sockets.
> 
> Reported-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Applied, thanks everyone.
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