It occurred to me that the problem could be the network stack hanging. I
mean X does depend on the network stack doesn't it? What happens if
you're logged into a terminal instead? Would it still lock you out? What
about processes in the background? A way to find out might be to run a
program that writes to a file the time, at every, say, 5-second
interval, for example:

#!/usr/bin/perl
while (1)
{
open(FILE,"$ENV{HOME}/test");
print FILE time();
close(FILE);
sleep(5);
}

And running that in the background.

-- 
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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