Well, I've seen lockups (no ping) on my machine as well from time to time.
It's using XF86_S3V, it has some Diamond graphics card (can dig
out exact name if needed).

It happens just occasionally, happened recently twice when I had shutdown
X-windows, no heavy load.

-- 
Jaromir Dolecek <dolecek@ics.muni.cz>	http://www.ics.muni.cz/~dolecek/
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It is better never to have been born.  But who among us has such luck?
One in a million, perhaps.