>What happens is the "crashed" machine remains pingable but does not
>respond to any other requests, and at the console it only prints memory
>status messages every few seconds but doesn't allow logins (IE it looks
>like all processes are stopped). On reboot everything looks hunky dory
>and there's nothing out of the ordinary in /var/log/messages or any
>other log that I could think to examine.

Back in my RedHat 7.2 days, I kept up-to-date on *all* the kernel
updates.

There was one particular kernel update that was applied to 2 identical
machines. One was "busier" than the other. What I soon noticed was
something
similar to your scenario, and the busier machine would last a shorter
amount
of time. After a few weeks, I started booting the n-1 kernel, and all
was
well again. Then when n+1 came out, I applied that, and never had
problems.

I'd check the files in /boot to see if a new kernel was automagically
installed
for you.

Marco

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