Doh, missed the comment for a long long time.

I've check /var/log/messages, dmesg, kern.log, but it didn't contain any
related information. messages is empty except for "Aug 17 02:11:13
frontend01 -- MARK --"'s, kern.log has two lines of TCP: Treason
uncloaked, but it's unrelated, wrong IP, dmesg ends just after boot with
[   78.195005] ip6_tables: (C) 2000-2006 Netfilter Core Team.

Attached is the lspci output - it's an almost standard Dell PE1950 III
configuration; although I don't think it's a hardware issue, that can't
make netstat -an list duplicate src-port-tar-port tuples.

As for the tests with a new kernel - the first thing I'll have to do is
to write a script to trigger it on demand. The servers were ordered in a
pair, one production, one testing, so I could try the new kernel. But
I'm not sure about installing karmic alpha - while it has a kvm-over-ip
card so a reinstall isn't completely impossible, that DRAC5-terminal is
a pain to use and we'll lose the ability to try out 8.04 update packages
on the spare machine until we revert the configuration.

So the plan is: make port crash script, trigger bug. Install new kernel,
if fixed: search for patch, wait for backport / upgrade to 9.04 and see
if that helps, if not fixed: try to trigger it on different hardware
within arms reach instead of over ip, much more debugging required.

** Attachment added: "lspci output"
   http://launchpadlibrarian.net/30404995/lspci.txt

-- 
tcp duplicate source port
https://bugs.launchpad.net/bugs/403750
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