I can't find a reference to this value in the IA32/IA64 developer's manual, so it's definitely a bug but I'm not sure where it's coming from. The code that gets executed in the event of the error though is under
Code:
lapic_handle_error
(which is only called in amd64/amd64/apic_vector.S and i386/i386/apic_vector.s).
I would definitely talk to jhb@ about this, but in the time being you can set 'hint.apic.0.disabled' in loader.conf, or device.hints, or choose the appropriate entry in the beastie boot menu; this will kill off any MSI interrupts and some SMP functionality. Be sure to tell him what your CPU is and your motherboard.
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