linux-kernel - Re: Badness at net/ipv4/inet_connection

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Message-Id: <20091214.112406.149143587.davem@davemloft.net>
Date:	Mon, 14 Dec 2009 11:24:06 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	john.dykstra1@...il.com, lists@...dbynature.de,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: Badness at net/ipv4/inet_connection_sock.c:293

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Mon, 14 Dec 2009 20:22:13 +0100

> Le 14/12/2009 20:11, David Miller a écrit :
>> From: John Dykstra <john.dykstra1@...il.com>
>> Date: Mon, 14 Dec 2009 18:57:13 +0000
>> 
>>> That test was changed to match a change in the return values of
>>> tcp_ack().  No logic change was intended.
>> 
>> As Eric pointed out, changing tcp_ack()'s behavior effects state
>> transitions out of SYN_ACK, so this commit is very likely the culprit.
>> 
>> I usually see 2 or 3 three of these bug triggers in the first ten
>> minutes after bootup and I haven't seen one yet in 20 minutes
>> with the commit reverted.
>> 
>> This change is definitely wrong.
> 
> Hmm, I didnt yet spotted the problem, just gave some hints ...

You did point out that tcp_ack's behavior could influence
TCP_SYN_* state behavior, and that's all I claimed.

My "definitely wrong" conclusion was based upon not triggering
the warning for several minutes (which turned out to be a fluke),
not your analysis.
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