The mcelog command doesn't support AMD processors and the resulting error message, which appears once in the syslog at boot-up, causes confusion and anxiety. For a list of supported CPUs type   mcelog --help   and to test whether the current CPU is supported run   mcelog --is-cpu-supported   which returns no error message and a return code of zero if the CPU is on the supported list, or the error message and a non-zero return code in the case of an unsupported CPU