From mboxrd@z Thu Jan  1 00:00:00 1970
From: Neal Cardwell <ncardwell@google.com>
Subject: Re: 3.0.23 WARNING: at net/ipv4/tcp_input.c:3375 tcp_ack+0x1d62/0x2030()
Date: Mon, 19 Mar 2012 13:39:38 -0400
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Cc: Greg KH <greg@kroah.com>,
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To: Eric Dumazet <eric.dumazet@gmail.com>
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On Mon, Mar 19, 2012 at 09:10:51AM +0100, Stefan Priebe - Profihost AG wrote:
> WARNING: at net/ipv4/tcp_input.c:3375 tcp_ack+0x1d62/0x2030()

I double-checked the warning, and indeed in the 3.0.23 tcp_input.c at

http://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=blob;f=net/ipv4/tcp_input.c;h=ee08f11ff21a802faa8b32efc1eb312e479878d6;hb=bf6a68d2a214e07f7c0d6538e00e17b826714160#l3375

that line is:
  WARN_ON((int)tp->sacked_out < 0);

So this indeed looks like the known issue that is fixed by the commits
Eric mentions, which are in 3.0.25.

neal