linux-kernel - Re: [PATCH 2/2] tcp: miscounts due to tcp

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Message-Id: <20090402.163235.153382360.davem@davemloft.net>
Date:	Thu, 02 Apr 2009 16:32:35 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	ilpo.jarvinen@...sinki.fi
Cc:	markus@...ppelsdorf.de, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, uwe.bugla@....de
Subject: Re: [PATCH 2/2] tcp: miscounts due to tcp_fragment pcount reset

From: "Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
Date: Thu, 2 Apr 2009 12:18:20 +0300 (EEST)

> 
> It seems that trivial reset of pcount to one was not sufficient
> in tcp_retransmit_skb. Multiple counters experience a positive
> miscount when skb's pcount gets lowered without the necessary
> adjustments (depending on skb's sacked bits which exactly), at
> worst a packets_out miscount can crash at RTO if the write queue
> is empty!
> 
> Triggering this requires mss change, so bidir tcp or mtu probe or
> like.
> 
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
> Reported-by: Markus Trippelsdorf <markus@...ppelsdorf.de>
> Tested-by: Uwe Bugla <uwe.bugla@....de>

Applied.
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