Consider the owner process may be dead

Signed-off-by: José Valim <jose.valim@plataformatec.com.br>

Author: José Valim

lib/elixir/lib/port.ex

@@ -236,8 +236,9 @@ defmodule Port do
 
   def info(port, :registered_name) do
     case :erlang.port_info(port, :registered_name) do
+      :undefined -> nil
       [] -> {:registered_name, []}
-      other -> nillify(other)
+      other -> other
     end
   end
 

lib/elixir/lib/task.ex

@@ -439,8 +439,8 @@ defmodule Task do
   defp get_info(pid) do
     self_or_name =
       case Process.info(pid, :registered_name) do
-        {:registered_name, []} -> self()
-        {:registered_name, name} -> name
+        {:registered_name, name} when is_atom(name) -> name
+        _ -> pid
       end
 
     {node(), self_or_name}

lib/elixir/lib/task/supervisor.ex

@@ -348,8 +348,8 @@ defmodule Task.Supervisor do
   defp get_info(self) do
     name =
       case Process.info(self, :registered_name) do
-        {:registered_name, []} -> self
-        {:registered_name, name} -> name
+        {:registered_name, name} when is_atom(name) -> name
+        _ -> self
       end
 
     {node(), name}