Jan 7 18:01:35 Tower kernel: mce: [Hardware Error]: Machine check events logged
Jan 7 18:01:35 Tower kernel: [Hardware Error]: Corrected error, no action required.
Jan 7 18:01:35 Tower kernel: [Hardware Error]: CPU:7 (17:8:2) MC1_STATUS[Over|CE|MiscV|AddrV|-|-|SyndV|-|-|-]: 0xdc20000000010859
Jan 7 18:01:35 Tower kernel: [Hardware Error]: Error Addr: 0x0000000a2a4f1080
Jan 7 18:01:35 Tower kernel: [Hardware Error]: IPID: 0x000100b000000000, Syndrome: 0x000000005a020300
Jan 7 18:01:35 Tower kernel: [Hardware Error]: Instruction Fetch Unit Ext. Error Code: 1, IC Microtag or Full Tag Multi-hit Error.
Jan 7 18:01:35 Tower kernel: [Hardware Error]: cache level: L1, mem/io: IO, mem-tx: IRD, part-proc: SRC (no timeout)
Jan 7 18:28:54 Tower kernel: mce: [Hardware Error]: Machine check events logged
Jan 7 18:28:54 Tower kernel: [Hardware Error]: Corrected error, no action required.
Jan 7 18:28:54 Tower kernel: [Hardware Error]: CPU:9 (17:8:2) MC1_STATUS[-|CE|MiscV|AddrV|-|-|SyndV|-|-|-]: 0x9c20000000010859
Jan 7 18:28:54 Tower kernel: [Hardware Error]: Error Addr: 0x0000000001150800
Jan 7 18:28:54 Tower kernel: [Hardware Error]: IPID: 0x000100b000000000, Syndrome: 0x000000005a020300
Jan 7 18:28:54 Tower kernel: [Hardware Error]: Instruction Fetch Unit Ext. Error Code: 1, IC Microtag or Full Tag Multi-hit Error.
Jan 7 18:28:54 Tower kernel: [Hardware Error]: cache level: L1, mem/io: IO, mem-tx: IRD, part-proc: SRC (no timeout)
Hardware errors being detected, looks like CPU related.