"John R. Shannon" <john@johnrshannon.com> writes:

> By lock up I mean that I can't get the system to respond to any
> input. There is no more userland progress. There is no output on the
> console. The computer does not respond to ping.

This sounds like a problem I had with some Pentium 4 systems when I
disabled hyperthreading, either in the BIOS or with "nosmp" on Xen's
command line.  The only fix I found was just to leave MP enabled.

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