diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index bb398c0c5f08..b5797b78add6 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4527,8 +4527,10 @@ void sched_show_task(struct task_struct *p)
 #ifdef CONFIG_DEBUG_STACK_USAGE
 	free = stack_not_used(p);
 #endif
+	ppid = 0;
 	rcu_read_lock();
-	ppid = task_pid_nr(rcu_dereference(p->real_parent));
+	if (pid_alive(p))
+		ppid = task_pid_nr(rcu_dereference(p->real_parent));
 	rcu_read_unlock();
 	printk(KERN_CONT "%5lu %5d %6d 0x%08lx\n", free,
 		task_pid_nr(p), ppid,