Exception Type 0x12 Machinecheck Exception Link - X64

Unlike typical exceptions (page faults, divide errors), MCEs are — they don’t necessarily relate to the currently executing instruction but reflect a hardware problem detected by the processor’s Machine Check Architecture (MCA).

The error log provided a "link" to the culprit: DETAILS: Uncorrectable PCI Express error detected. PCI Segment = 0x00 . x64 exception type 0x12 machinecheck exception link

Advisory: Apollo 6500 Gen10 - System May Report an Uncorrectable Machine Check Exception (MCE) During Boot When an SN1200E or SN1600E Fibre Channel HBA Is Installed Unlike typical exceptions (page faults, divide errors), MCEs