When I run 2.6.21-rc5 + Andi's x86 patches + paravirt_ops patches, I've
been getting my machine shut down with critical thermal shutdown messages:

Mar 30 23:19:03 localhost kernel: ACPI: Critical trip point
Mar 30 23:19:03 localhost kernel: Critical temperature reached (128 C), shutting down.
Mar 30 23:19:03 localhost kernel: Critical temperature reached (128 C), shutting down.
Mar 30 23:19:03 localhost shutdown[19417]: shutting down for system halt

and the machine does feel pretty hot.  Interestingly, when the machine
reboots, the fan spins up to a noticeably higher speed, so it seems that
maybe something is getting fan speed control wrong.

The machine is a Thinkpad X60, with a 1.8GHz Core Duo.  I can run it
indefinitely with the FC6 2.6.20-1.2933.fc6 kernel, so I don't think
there's anything wrong with the hardware.  And it was sitting on a
desktop plugged into mains, so there's no problems with obstructed airflow.

I was running a normal email/browsing/editing/compiling workload, and I
don't think there was anything particularly CPU intensive running at the
time.  I run cpufreq with the conservative governor.

Running now with the FC6 kernel, I get:
: ezr:pts/2; cat /proc/acpi/thermal_zone/THM?/temperature
temperature:             69 C
temperature:             82 C


Config attached.

    J