Just to clarify the above, I didn't mean that no lockup occurs above
80kBps, only that it occurs even at speeds (as low?) as below 80.

The hardware seems fine: ran self-test on CPU, ran memtest, network card
runs fine on another laptop. The lock-up occurs only under heavy network
traffic, so I'm leaning towards a software cause and I think some sort
of postmortem info would be the most useful. I'll go and find out how to
obtain that, but would appreciate pointers on how to do it in this
specific circumstance, ie, full lock-up.

Still, for kicks I'll also add further data points by running live CDs
later on.

-- 
Heavy network activity (eg: torrent/nfs file transfers) causes Hard System 
Locks and/or Network Freezes.
https://bugs.launchpad.net/bugs/147464
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Bugs, which is the bug contact for Ubuntu.

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