weird, boot CPU (#0) not listed by the BIOS. SMP motherboard not detected. Enabling APIC mode: Flat. Using 0 I/O APICs ------------[ cut here ]------------ WARNING: at arch/x86/kernel/apic/apic.c:1299 setup_local_APIC+0x22c/0x2e2() Hardware name: VirtualBox Modules linked in: Pid: 1, comm: swapper Not tainted 3.1.5 #1 Call Trace: [] warn_slowpath_common+0x6a/0x7f [] ? setup_local_APIC+0x22c/0x2e2 [] warn_slowpath_null+0x14/0x18 [] setup_local_APIC+0x22c/0x2e2 [] APIC_init_uniprocessor+0x94/0xe9 [] native_smp_prepare_cpus+0x1d1/0x3b8 [] ? start_kernel+0x2e3/0x2e3 [] kernel_init+0x3c/0xfd [] kernel_thread_helper+0x6/0x10 ---[ end trace a7919e7f17c0a725 ]--- APIC calibration not consistent with PM-Timer: 145ms instead of 100ms APIC delta adjusted to PM-Timer: 6289924 (9125077)