Hi, On Thu, Jul 30, 2009 at 04:55:44PM +0530, Sachin Sant wrote: > Today's Next failed to boot on a x86_64 box with following traces > > ACPI: Core revision 20090625 > BUG: unable to handle kernel NULL pointer dereference at (null) > IP: [<ffffffff81328c7b>] set_cpu_sibling_map+0x24f/0x353 I can't trigger it here, please send me your .config. In the meantime, you could try the following: -- diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 3ede593..5fd57fe 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -1070,6 +1070,7 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus) for_each_possible_cpu(i) { zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL); zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL); + zalloc_cpumask_var(&per_cpu(cpu_node_map, i), GFP_KERNEL); zalloc_cpumask_var(&cpu_data(i).llc_shared_map, GFP_KERNEL); } set_cpu_sibling_map(0); -- 1.6.3.3 -- Regards/Gruss, Boris. Operating | Advanced Micro Devices GmbH System | Karl-Hammerschmidt-Str. 34, 85609 Dornach b. München, Germany Research | Geschäftsführer: Thomas M. McCoy, Giuliano Meroni Center | Sitz: Dornach, Gemeinde Aschheim, Landkreis München (OSRC) | Registergericht München, HRB Nr. 43632 -- To unsubscribe from this list: send the line "unsubscribe linux-next" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html