MCE hardware error, but no message

[Jan Engelhardt]

Running Linux 2.6.37, I am getting these errors on one of a box:

[696782.810387] [Hardware Error]: No human readable MCE decoding support 
on this CPU type.
[696782.810470] [Hardware Error]: Run the message through 'mcelog 
--ascii' to decode.
[696783.585853] [Hardware Error]: No human readable MCE decoding support 
on this CPU type.
[696783.585937] [Hardware Error]: Run the message through 'mcelog 
--ascii' to decode.

Except that it never tells me the actual non-human readable form.
The error starts to show after 6-48 hours after a reboot (including 
warm reboots). A second machine of the exact same configuration shows no 
problems over the past 30 days. Environmental sensors of the problem box 
show normal parameters.

How would I get the messages to run through mcelog?
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