current->sched_class->yield_task is NULL, any hint?

Lin Ming minggr at
Wed Apr 9 11:32:20 PDT 2014

On Wed, Apr 9, 2014 at 11:25 AM, Peter Zijlstra <peterz at> wrote:
> On Wed, Apr 09, 2014 at 10:43:32AM -0700, Lin Ming wrote:
>> Hi Peter,
>> I hit a panic in sys_sched_yield() because(for some unknown reason)
>> current->sched_class->yield_task is NULL.
>> It's an ARM embedded board with 3.4-rt kernel.
>> Could you share any hint for the possible causes?
> What class does current->sched_class point to?

[12890.088232] Process swapper/0 (pid: 0, stack limit = 0xc07042f0)

It's idle task. I think it should be idle_sched_class.
But let me double check it.


More information about the linux-arm-kernel mailing list