JOBCTL_TRACED
#define task_is_traced(task) ((READ_ONCE(task->jobctl) & JOBCTL_TRACED) != 0)
#define task_is_stopped_or_traced(task) ((READ_ONCE(task->jobctl) & (JOBCTL_STOPPED | JOBCTL_TRACED)) != 0)
t->jobctl &= ~(JOBCTL_STOPPED | JOBCTL_TRACED);
t->jobctl &= ~JOBCTL_TRACED;
task->jobctl &= ~JOBCTL_TRACED;
child->jobctl &= ~JOBCTL_TRACED;
current->jobctl |= JOBCTL_TRACED;