"BUG: soft lockup detected on CPU#0!"

Anybody know what this error message is about? Looking at Google,
it appears that lots of people see it from time to time, but nobody
has a definitive explanation for it.

I updated to kernel 2.6.20-1.2948 and started having the problem
(along with a completely unresponsive computer). Reverted to
2.6.19-1.2911.6.5 and everything's ok.

--
-jdr-

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