netdev - Re: 2.6.32-rc5-mmotm1101 - kernel BUG at net/ipv4/tcp

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Message-ID: <4AF12149.1060305@codefidence.com>
Date:	Wed, 04 Nov 2009 08:38:01 +0200
From:	Gilad Ben-Yossef <gilad@...efidence.com>
To:	Valdis.Kletnieks@...edu
CC:	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Ori Finkelman <ori@...sleep.com>
Subject: Re: 2.6.32-rc5-mmotm1101 - kernel BUG at net/ipv4/tcp_input.c:3707!

Valdis.Kletnieks@...edu wrote:

> On Tue, 03 Nov 2009 23:34:19 +0200, Ilpo JÃâ‚¬rvinen said:
>
>   
>> On Tue, 3 Nov 2009, Gilad Ben-Yossef wrote:
>>
>>     
>>> Eric Dumazet wrote:
>>>
>>>       
>>>> Valdis.Kletnieks@...edu a écrit :
>>>>   
>>>>         
>>>>> Seen right after I started 'fetchmail'.  Reproducible - 3 out of 3.
>>>>> I'll bisect this tonight if nobody jumps up and yells they know what it
>>>>> is...
>>>>>     
>>>>>           
>>> Bah... this is most probably my fault. Sorry about that.
>>>
>>> Can you please try the patch in the next email?
>>>       
>
> Tried while at home, machine panic'ed.  No netconsole here at the moment, sorry.
>   

Ok, thanks.That is ... strange.

I didn't manage to recreate this here with a simple IPv6 set and netcat
as server client but I will try further, but if there is any way to send me
the crash location that would be a big help. Thanks.
>   
>
> Why was this blowing chunks in the IPv6 when I was making an IPv4 connection
> then? I just noticed that. My fetchmail can't make an IPv6 TCP connection to
> our IMAP server because the server isn't v6-enabled yet.  And although I
> contact our DNS over IPv6, but that's UDP not TCP.
>
>   
I don't think the chunk blowing occurred due to the connection to the IMAP
server. That codes deals with incoming SYNs. I guess it happened when 
fetchmail
tried to connect to the local mail daemon and this should be happening 
over the loopback interface...


Gilad


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