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Conntrack leak (2.6.2rc2)

To: netdev@xxxxxxxxxxx
Subject: Conntrack leak (2.6.2rc2)
From: Steve Hill <steve@xxxxxxxxxxxx>
Date: Mon, 2 Feb 2004 08:56:45 +0000 (GMT)
Sender: netdev-bounce@xxxxxxxxxxx
I've already posted this to the netfilter-devel list and had no response 
so I'm hoping that some of you might have some insight into the problem:

I'm using the 2.6.2rc2 kernel and have a strange connection tracking 
problem - when using unfragmented packets every thing is fine - a new 
connection is made and init_conntrack() is called, and as the session is 
timed out by conntrack, destroy_conntrack() is called.  Absolutely fine.

However, if I start a connection with a fragmented packet (i.e. my MTU 
is 1500 bytes, so "ping -c 1 -s 2500" sends a packet consisting 
of 2 fragments), init_conntrack() is called as usual, but when the session 
is timed out destroy_conntrack() never gets called.  This means that the 
memory for the connection is never freed and ip_conntrack_count is never 
decremented.  However, the connection is still removed from the hash 
table.  This means that it leaks memory, and eventually reaches 
ip_conntrack_max and starts dropping new connections.


- Steve Hill
Senior Software Developer                        Email: steve@xxxxxxxxxxxx
Navaho Technologies Ltd.                           Tel: +44-870-7034015

        ... Alcohol and calculus don't mix - Don't drink and derive! ...

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