diff --git a/include/linux/pid.h b/include/linux/pid.h
index 9645b1194c98..034e3cd60dc0 100644
--- a/include/linux/pid.h
+++ b/include/linux/pid.h
@@ -85,6 +85,10 @@ static inline struct pid *get_pid(struct pid *pid)
 
 extern void put_pid(struct pid *pid);
 extern struct task_struct *pid_task(struct pid *pid, enum pid_type);
+static inline bool pid_has_task(struct pid *pid, enum pid_type type)
+{
+	return !hlist_empty(&pid->tasks[type]);
+}
 extern struct task_struct *get_pid_task(struct pid *pid, enum pid_type);
 
 extern struct pid *get_task_pid(struct task_struct *task, enum pid_type type);
diff --git a/kernel/fork.c b/kernel/fork.c
index 782986962d47..ffa314838b43 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1732,15 +1732,20 @@ static int pidfd_release(struct inode *inode, struct file *file)
  */
 static void pidfd_show_fdinfo(struct seq_file *m, struct file *f)
 {
-	struct pid_namespace *ns = proc_pid_ns(file_inode(m->file));
 	struct pid *pid = f->private_data;
-	pid_t nr = pid_nr_ns(pid, ns);
+	struct pid_namespace *ns;
+	pid_t nr = -1;
 
-	seq_put_decimal_ull(m, "Pid:\t", nr);
+	if (likely(pid_has_task(pid, PIDTYPE_PID))) {
+		ns = proc_pid_ns(file_inode(m->file));
+		nr = pid_nr_ns(pid, ns);
+	}
+
+	seq_put_decimal_ll(m, "Pid:\t", nr);
 
 #ifdef CONFIG_PID_NS
-	seq_put_decimal_ull(m, "\nNSpid:\t", nr);
-	if (nr) {
+	seq_put_decimal_ll(m, "\nNSpid:\t", nr);
+	if (nr > 0) {
 		int i;
 
 		/* If nr is non-zero it means that 'pid' is valid and that
@@ -1749,7 +1754,7 @@ static void pidfd_show_fdinfo(struct seq_file *m, struct file *f)
 		 * Start at one below the already printed level.
 		 */
 		for (i = ns->level + 1; i <= pid->level; i++)
-			seq_put_decimal_ull(m, "\t", pid->numbers[i].nr);
+			seq_put_decimal_ll(m, "\t", pid->numbers[i].nr);
 	}
 #endif
 	seq_putc(m, '\n');