netdev - Re: [Bugme-new] [Bug 15507] New: kernel misses 3rd part of tcp handshake (ACK), stays in SYN

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Message-ID: <1269006129.3048.36.camel@edumazet-laptop>
Date:	Fri, 19 Mar 2010 14:42:09 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Joshua Roys <roysjosh@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, netdev@...r.kernel.org,
	bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org
Subject: Re: [Bugme-new] [Bug 15507] New: kernel misses 3rd part of tcp
 handshake (ACK), stays in SYN_RECV state

Le vendredi 19 mars 2010 à 07:53 -0400, Joshua Roys a écrit :
> On 03/18/2010 07:12 PM, Eric Dumazet wrote:
> >
> > I would say this is expected if httpd server set DEFER_ACCEPT socket
> > option.
> >
> >
> >
> 
> Gah!  You've got to be kidding :)  If that's what it is, close the 
> bug...  and I'll go read some man-pages!
> 

So you _confirm_ DEFER_ACCEPT is not used, its _important_ for us.

I dont believe my comment was trivial at all :)

I gave a hint to myself and other network guys, because we did some
changes in this area lately (commit b103cf34 tcp: fix TCP_DEFER_ACCEPT
retrans calculation) from Julian Anastasov.

git describe b103cf34
v2.6.31-9056-gb103cf3

Please boot a fresh vm, then try exactly 10 'bad connects', please make
each attempt last at least 2 minutes. (you can start all these in
parallel)

And report :

netstat -s


(My FC12 copy doesnt exhibit this problem)

Thanks


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