I will pass this on though: during the boot of the virt-rescue, I see this: 1.605763] ------------[ cut here ]------------ [ 1.606763] WARNING: at arch/x86/kernel/apic/apic.c:1318 setup_local_APIC+0x2af/0x3ac() [ 1.609763] Hardware name: Bochs [ 1.611763] Modules linked in: [ 1.620761] Pid: 1, comm: swapper/0 Not tainted 3.2.0-23-lowlatency #31-Ubuntu [ 1.623761] Call Trace: [ 1.636759] [<c10436c2>] warn_slowpath_common+0x72/0xa0 [ 1.640758] [<c1548ae7>] ? setup_local_APIC+0x2af/0x3ac [ 1.643758] [<c1548ae7>] ? setup_local_APIC+0x2af/0x3ac [ 1.645757] [<c1043712>] warn_slowpath_null+0x22/0x30 [ 1.648757] [<c1548ae7>] setup_local_APIC+0x2af/0x3ac [ 1.652756] [<c1786a79>] native_smp_prepare_cpus+0x160/0x1f9 [ 1.654756] [<c177b7e7>] kernel_init+0x61/0x13f [ 1.656756] [<c177b786>] ? start_kernel+0x362/0x362 [ 1.658755] [<c156a37e>] kernel_thread_helper+0x6/0x10 [ 1.719746] ---[ end trace a7919e7f17c0a725 ]--- Not sure why the lowlatency kernel name showed up; I'm not booted into that one, although it does exist in the /boot of the test machine.