On Fri, Oct 08, 2010 at 09:31:02AM -0400, Dave Anderson wrote: > I don't think that this is associated with KVM, but rather the kernel > version used. It should be pretty easy to debug on your end, because it > boils down to these initializations at the top of x86_64_per_cpu_init() > > irq_sp = per_cpu_symbol_search("per_cpu__irq_stack_union"); > cpu_sp = per_cpu_symbol_search("per_cpu__cpu_number"); > > If it's a UP kernel, and if "irq_sp" does not get set, then isize would > be left uninitialized. It's a uniprocessor amd64 kernel. Neither irq_sp nor cpu_sp get set. I have crash> sym irq_stack_union ffffffff81a1c000 (D) irq_stack_union crash> sym cpu_number symbol not found: cpu_number It's not accepted by per_cpu_symbol_search() because its type is not 'V' and because it's not between __per_cpu_start and __per_cpu_end. __per_cpu_start and __per_cpu_end are the same; I don't know if there's something wrong with that.