2016-08-12 13:30 GMT+08:00 Huaitong Han <[email protected]>: > percpu cpus_in_cluster is a pointer with CONFIG_CPUMASK_OFFSTACK, > cpu_in_cluster > is not alloced memory before x2apic_prepare_cpu is invoked, so cpumask_set_cpu > would get a NULL pointer bug: > BUG: unable to handle kernel NULL pointer dereference at (null) > IP: [<ffffffff8105ac25>] x2apic_cluster_probe+0x35/0x70
Could you try this? https://lkml.org/lkml/2016/8/4/345 Regards, Wanpeng Li
