Issue #5715: In socketserver, close the server socket in the child process.

Lib/socketserver.py

@@ -529,10 +529,10 @@ class ForkingMixIn:
                 self.active_children = []
             self.active_children.append(pid)
             self.close_request(request)
-            return
         else:
             # Child process.
             # This must never return, hence os._exit()!
+            self.socket.close()
             try:
                 self.finish_request(request, client_address)
                 os._exit(0)

Misc/NEWS

@@ -75,6 +75,8 @@ Core and Builtins
 Library
 -------
 
+- Issue #5715: In socketserver, close the server socket in the child process.
+
 - Issue #12124: zipimport doesn't keep a reference to zlib.decompress() anymore
   to be able to unload the module.