Hi Yisheng, On Tue, Sep 20, 2016 at 11:29:24AM +0800, Yisheng Xie wrote: > On 2016/9/19 22:07, Mark Rutland wrote: > > On Mon, Sep 19, 2016 at 09:05:26PM +0800, Yisheng Xie wrote: > > Can you modify the warning in cpumask.h to dump the bad CPU number? That > > would make it fairly clear if that's the case. > > > hi Mark, > I dump the bad CPU number, it is 64, > And the cpumask get from task is 00000000,00000000. > > [ 3.873044] select_task_rq: allowed 0, allow_cpumask 00000000,00000000 > [ 3.879727] cpumask_check: cpu 64, nr_cpumask_bits:64, nr_cpu_ids= 64 > [ 3.895989] ------------[ cut here ]------------ > [ 3.900652] WARNING: CPU: 16 PID: 103 at ./include/linux/cpumask.h:122 try_to_wake_up+0x410/0x4ac Can you look at this patch from David, please: http://lists.infradead.org/pipermail/linux-arm-kernel/2016-September/458110.html and offer a Tested-by if it fixes your problem? Thanks, Will -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>