netdev - Re: Network hangs with 2.6.30.5

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Message-Id: <20091119.154038.194307613.davem@davemloft.net>
Date:	Thu, 19 Nov 2009 15:40:38 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	ilpo.jarvinen@...sinki.fi
Cc:	jarkao2@...il.com, holger.hoffstaette@...glemail.com,
	netdev@...r.kernel.org, eric.dumazet@...il.com, zbr@...emap.net
Subject: Re: Network hangs with 2.6.30.5

From: "Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
Date: Fri, 2 Oct 2009 11:11:55 +0300 (EEST)

> On Thu, 1 Oct 2009, David Miller wrote:
> 
>> From: Jarek Poplawski <jarkao2@...il.com>
>> Date: Mon, 7 Sep 2009 07:21:43 +0000
>> 
>> I also looked through all the TCP commits in 2.6.29 to 2.6.30
>> and I could not find anything else that might cause stalls with
>> time-wait recycled connections.
> 
> What about the more than 64k connections change a9d8f9110d7e953c2f2 (or 
> its fixes), it might be another possibility? ...It certainly does 
> something related to reuse and happens to be in the correct time frame... 
> (I've added Evgeniy).

So I've been studying this one quite a bit.

This change could only cause problems in timewait recycling if it:

1) Would accept using a bind bucket that previously it would not

2) Caused socket corruption due to bad locking

And I can find neither problem with the Evgeniy's bind changes.

So we've back to square one I think.
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