> 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) ...