OK, we are much closer to repeating this oops. Ignore the original
instructions - that seems to be a surprising lxc feature rather than the
oops.

In order to repeat, you need to have
a) a container
b) which is forwarding IPv4 traffic from one interface in the container to 
another (2 veth interfaces in this case) - one ping packet per second will do
c) iptables with an IP conntrack rule.
d) delete the container (it doesn't matter if you delete the iptables rule 
first and sleep for a couple of seconds).

You then get the oops above. This also occurs on

root@node-10-157-128-101:~# uname -a
Linux node-10-157-128-101 3.0.0-10-server #16-Ubuntu SMP Fri Sep 2 18:51:05 UTC 
2011 x86_64 GNU/Linux

I have attached a double oops from that kernel too.

** Attachment added: "oops.txt"
   
https://bugs.launchpad.net/ubuntu/+source/linux-lts-backport-natty/+bug/843892/+attachment/2376908/+files/oops.txt

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https://bugs.launchpad.net/bugs/843892

Title:
  Repeatable kernel oops on container delete

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