I just sshed into a box that runs squid at a remote site and found this running on it:
root 1563 99.7 0.0 1944 408 ? R May27 10026:55 modprobe -r ipt_state

May27 I think is the date when I tried to set up a proxy on this server to forward SMTP (managed to solve the problem another way). As far as I can tell, this command isn't related to squid, so stopping it would be quite nice, squid is the only thing that has to run on this computer.

I don't seem to be able to kill it though, it just stays there. It's putting my server load up to 1.5 average, which is very high for an Athlon 2600+ running only squid for 6 or 7 clients (spare box lying around, might do something more adventurous later).

Thanks in advance.

Martin