netdev - Re: [fixed] [patch] Re: [bug] stuck localhost TCP connections, v2.6.26-rc3+

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Message-Id: <1212548093.12617.0.camel@tng>
Date:	Tue, 03 Jun 2008 22:54:52 -0400
From:	Patrick McManus <mcmanus@...ksong.com>
To:	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
Cc:	David Miller <davem@...emloft.net>, mingo@...e.hu,
	peterz@...radead.org, LKML <linux-kernel@...r.kernel.org>,
	Netdev <netdev@...r.kernel.org>, rjw@...k.pl,
	Andrew Morton <akpm@...ux-foundation.org>, johnpol@....mipt.ru
Subject: Re: [fixed] [patch] Re: [bug] stuck localhost TCP connections,
	v2.6.26-rc3+

On Wed, 2008-06-04 at 02:22 +0300, Ilpo Järvinen wrote:
==
> --
> [PATCH] tcp DEFER_ACCEPT: fix racy access to listen_sk
> 
> It seems that replacement of DA code also moved parts outside
> of appropriate locking. The Ingo's problem seems to come from
> the fact that two flows could now race in
> (inet_csk_)reqsk_queue_add corrupting the queue. ...This can
> leave dangling socks around which won't resolve themselves
> without stimuli from outside (e.g., external RST would help
> I think).


Ilpo, has anyone told you today that you rock? Well allow me - you
rock.
> 
do_rcv() clearly has the listening socket locked in the non-DA case, and
in the DA case it is the 'child' ESTABLISHED socket that is locked -
leaving the accept queue unprotected. So simple.

-Pat


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