linux-kernel - Re: [2.6.35-rc3 regression] TCP connections on 'lo' interface randomly stall

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Date:	Mon, 14 Jun 2010 21:36:05 +0200
From:	Thomas Bächler <thomas@...hlinux.org>
To:	Randy Dunlap <randy.dunlap@...cle.com>
CC:	"David S. Miller" <davem@...emloft.net>,
	John Fastabend <john.r.fastabend@...el.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [2.6.35-rc3 regression] TCP connections on 'lo' interface randomly
 stall

Am 14.06.2010 20:23, schrieb Randy Dunlap:
> On Mon, 14 Jun 2010 20:10:27 +0200 Thomas Bächler wrote:
> 
>> With 2.6.35-rc3, I cannot use TCP over the 'lo' interface any more. This
>> is reproduced easily by running 'ssh localhost' and executing a few
>> commands inside the ssh session (if you are able to log in, 'ls -lhFR /'
>> does a good job) - the connection will stall completely after a very
>> short time. As far as I can see, all applications are affected.
>>
>> It also seems that once a service is "stalled", I cannot open a new
>> connection to the same TCP port anymore. However, I can open a
>> connection to a different port until that one is stalled, too.
>>
>> Running wireshark, I can see that TCP retransmissions are sent, but
>> never acknowledged.
>>
>> Bisection (starting with 7908a9e as good and v2.6.35-rc3 as bad) leads
>> to the following commit. Please CC me on replies to this issue. Thanks
>> for your help.
> 
> Does this patch fix it for you?
> http://lkml.org/lkml/2010/6/13/155

Yes, it seems to fix it. Thanks.


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