diff --git a/Lib/asyncio/base_subprocess.py b/Lib/asyncio/base_subprocess.py
index 81698b09850..afc434defa2 100644
--- a/Lib/asyncio/base_subprocess.py
+++ b/Lib/asyncio/base_subprocess.py
@@ -182,6 +182,7 @@ def __repr__(self):
     def connection_lost(self, exc):
         self.disconnected = True
         self.proc._pipe_connection_lost(self.fd, exc)
+        self.proc = None
 
     def pause_writing(self):
         self.proc._protocol.pause_writing()
diff --git a/Lib/asyncio/futures.py b/Lib/asyncio/futures.py
index e0e12f0579b..19212a94b9f 100644
--- a/Lib/asyncio/futures.py
+++ b/Lib/asyncio/futures.py
@@ -405,5 +405,5 @@ def _check_cancel_other(f):
     new_future.add_done_callback(_check_cancel_other)
     fut.add_done_callback(
         lambda future: loop.call_soon_threadsafe(
-            new_future._copy_state, fut))
+            new_future._copy_state, future))
     return new_future
diff --git a/Lib/selectors.py b/Lib/selectors.py
index 598845d43b0..5850deaddf7 100644
--- a/Lib/selectors.py
+++ b/Lib/selectors.py
@@ -256,6 +256,7 @@ def modify(self, fileobj, events, data=None):
 
     def close(self):
         self._fd_to_key.clear()
+        self._map = None
 
     def get_map(self):
         return self._map