ipc: enable is_ns_init_id() assertions

The ipc namespace may call put_ipc_ns() and get_ipc_ns() before it is
added to the namespace tree. Assign the id early like we do for a some
other namespaces.

Link: https://patch.msgid.link/20251110-work-namespace-nstree-fixes-v1-11-e8a9264e0fb9@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: brauner

ipc/namespace.c

@@ -66,6 +66,7 @@ static struct ipc_namespace *create_ipc_ns(struct user_namespace *user_ns,
 	if (err)
 		goto fail_free;
 
+	ns_tree_gen_id(ns);
 	ns->user_ns = get_user_ns(user_ns);
 	ns->ucounts = ucounts;
 
@@ -86,7 +87,7 @@ static struct ipc_namespace *create_ipc_ns(struct user_namespace *user_ns,
 
 	sem_init_ns(ns);
 	shm_init_ns(ns);
-	ns_tree_add(ns);
+	ns_tree_add_raw(ns);
 
 	return ns;