linux-kernel - Re: [PATCH] tproxy: nf_tproxy_assign

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Message-ID: <AANLkTikmuK0iWDjmG6lVgPyoZAHQ7ZdJmQobVrAQmgNh@mail.gmail.com>
Date:	Wed, 14 Jul 2010 00:51:33 -0300
From:	Felipe W Damasio <felipewd@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Avi Kivity <avi@...hat.com>, David Miller <davem@...emloft.net>,
	Patrick McHardy <kaber@...sh.net>,
	linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] tproxy: nf_tproxy_assign_sock() can handle tw sockets

Hi,

2010/7/14 Eric Dumazet <eric.dumazet@...il.com>:
>> I can, but my bosses will kick my ass if I bring down the ISP again :)
>
> I have no guarantee at all, even if we find the bug.

Ok :-)

>> If you think it's the only way to find the problem I'll tell them that
>> I need to do it. In this case, please tell me what other config
>> options/tools I can use to get as much info as possible...since I'll
>> probably be able to test this only once more on the production
>> environment for debugging purposes.
>
> You really should try to setup a lab to trigger the bug, and not doing
> experiments on production :)

Right, I'm trying.

The thing is: The ISP is a 200Mbps network with 10,000 users. The
first time it took around 2 minutes to trigger the bug. The second
time it took around 17 minutes.

So I *think* it's some TCP flag with some weird content...but I can't
find out what it is so I can trigger it on the lab.

So my only guess is to enable every possible debug flag I can think of
to track the bug down on the production environment. Any hints here
would be appreciated :)

Cheers,

Felipe Damasio
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