commit 0aab8660cdaa540730994afbce49a146dd779bce
author Victor Stinner <vstinner@redhat.com> Wed Jun 27 15:18:39 2018 +0200
committer GitHub <noreply@github.com> Wed Jun 27 15:18:39 2018 +0200
tree 239202f2522f1020e7c5f29d1675b2b11becb06c
parent 2cc9d21fffb8146d30e6fb4221e32410ba4b4ab7

bpo-33929: Fix regression in spawn_main() (#7962)

OpenProcess() creates a new handle that must be closed later.

Lib/multiprocessing/spawn.py

diff --git a/Lib/multiprocessing/spawn.py b/Lib/multiprocessing/spawn.py
index 2de4cb7..73aa694 100644
--- a/Lib/multiprocessing/spawn.py
+++ b/Lib/multiprocessing/spawn.py
@@ -103,8 +103,12 @@
                 _winapi.PROCESS_DUP_HANDLE, False, parent_pid)
         else:
             source_process = None
-        new_handle = reduction.duplicate(pipe_handle,
-                                         source_process=source_process)
+        try:
+            new_handle = reduction.duplicate(pipe_handle,
+                                             source_process=source_process)
+        finally:
+            if source_process is not None:
+                _winapi.CloseHandle(source_process)
         fd = msvcrt.open_osfhandle(new_handle, os.O_RDONLY)
     else:
         from . import semaphore_tracker