READ_ONCE_TASK_STACK
fp = READ_ONCE_TASK_STACK(task, frame->fp);
pc = READ_ONCE_TASK_STACK(task, frame->ra);
addr = READ_ONCE_TASK_STACK(state->task, *addr_p);
next_bp = (unsigned long *)READ_ONCE_TASK_STACK(state->task, *state->bp);