Hardware Error $ journalctl -b | grep Hardware Jul 11 08:28:17 kiki kernel: mce: [Hardware Error]: CPU 0: Machine Check: 0 Bank 4: a600000000020408 Jul 11 08:28:17 kiki kernel: mce: [Hardware Error]: TSC 0 ADDR fef13580 Jul 11 08:28:17 kiki kernel: mce: [Hardware Error]: PROCESSOR 0:506c9 TIME 1499754494 SOCKET 0 APIC 0 microcode 1c Jul 11 08:28:31 kiki systemd[1]: Started Hardware RNG Entropy Gatherer Daemon. Jul 11 08:28:31 kiki mcelog[684]: Hardware event. This is not a software error. Jul 11 08:28:32 kiki systemd[1]: Starting Hardware Monitoring Sensors... Jul 11 08:28:32 kiki systemd[1]: Started Hardware Monitoring Sensors. Jul 11 08:33:47 kiki kernel: mce: [Hardware Error]: Machine check events logged $ mcelog mcelog: Family 6 Model 5c CPU: only decoding architectural errors mcelog: warning: 24 bytes ignored in each record mcelog: consider an update
see also Bug 1467040 on FC25