Comment 1 for bug 1713408

3308 static const CPUArchIdList *spapr_possible_cpu_arch_ids(MachineState *machine)
3309 {
3310 int i;
3311 int spapr_max_cores = max_cpus / smp_threads; <<<<<< max_cpus is -ve and spapr_max_cores will also be -ve

...

3321
3322 machine->possible_cpus = g_malloc0(sizeof(CPUArchIdList) +
3323 sizeof(CPUArchId) * spapr_max_cores);

g_malloc0(is getting a -ve value) and then fails with a trap.