mcelog

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Machine Checked Exceptions (MCE) are not logged anywhere by default. The Linux kernel makes them visible in userspace through a character device.

mknod /dev/mcelog c 10 227

If you install the mcelog package and see this message, /dev/mcelog not active, it means that you did not create the device. In some systems this is done automatically by udev, but in other systems you must create it manually.

See also http://en.wikipedia.org/wiki/Machine_Check_Exception