---

yaml
---
r: 346309
b: refs/heads/master
c: 5e1182d
h: refs/heads/master
i:
  346307: 47e3940
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 0a01f2cc390e10633a54f72c608cc3fe19a50c3d
+refs/heads/master: 5e1182deb81ae8c68494017c4a8a71811659c870

trunk/kernel/pid.c

@@ -274,8 +274,10 @@ void free_pid(struct pid *pid)
 	for (i = 0; i <= pid->level; i++) {
 		struct upid *upid = pid->numbers + i;
 		hlist_del_rcu(&upid->pid_chain);
-		if (--upid->ns->nr_hashed == 0)
+		if (--upid->ns->nr_hashed == 0) {
+			upid->ns->nr_hashed = -1;
 			schedule_work(&upid->ns->proc_work);
+		}
 	}
 	spin_unlock_irqrestore(&pidmap_lock, flags);
 
@@ -321,6 +323,8 @@ struct pid *alloc_pid(struct pid_namespace *ns)
 
 	upid = pid->numbers + ns->level;
 	spin_lock_irq(&pidmap_lock);
+	if (ns->nr_hashed < 0)
+		goto out_unlock;
 	for ( ; upid >= pid->numbers; --upid) {
 		hlist_add_head_rcu(&upid->pid_chain,
 				&pid_hash[pid_hashfn(upid->nr, upid->ns)]);
@@ -331,6 +335,8 @@ struct pid *alloc_pid(struct pid_namespace *ns)
 out:
 	return pid;
 
+out_unlock:
+	spin_unlock(&pidmap_lock);
 out_free:
 	while (++i <= ns->level)
 		free_pidmap(pid->numbers + i);