diff --git a/mercurial/commandserver.py b/mercurial/commandserver.py
--- a/mercurial/commandserver.py
+++ b/mercurial/commandserver.py
@@ -494,6 +494,8 @@
                     conn.close()  # release handle in parent process
             else:
                 try:
+                    selector.close()
+                    self._sock.close()
                     self._runworker(conn)
                     conn.close()
                     os._exit(0)