> 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)
...


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