> I am running the Plan 9 on the single CPU only (old IBM T30).
Sorry, that means we are looking at two different panics.
Mine seems to be a side effect of mpacpi.c trying to enable
the same cpu twice:
cpu0: 1599MHz GenuineIntel Atom (cpuid: AX 0x106C2 DX 0xBFE9FBFF)
...
mpinit: mp table describes 2 cpus
mpinit: scanning acpi madt for extra cpus
...
mpacpiproc: apic 0xf04705c0
mpacpiproc: apic 0xf0470648
cpu1: 1600MHz GenuineIntel Atom (cpuid: AX 0x106C2 DX 0xBFE9FBFF)
cpu1: 1599MHz GenuineIntel Atom (cpuid: AX 0x106C2 DX 0xBFE9FBFF)
...