From 0a5541514ec9f1be9d879b7c5a9e5bacba4a7ae5 Mon Sep 17 00:00:00 2001
From: Albert Zeyer <albzey@gmail.com>
Date: Mon, 13 May 2024 09:37:14 +0200
Subject: [PATCH 1/2] fix potential hang

Fix gh-118981
---
 Lib/multiprocessing/popen_spawn_posix.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Lib/multiprocessing/popen_spawn_posix.py b/Lib/multiprocessing/popen_spawn_posix.py
index 24b8634523e5f2..cccd659ae77637 100644
--- a/Lib/multiprocessing/popen_spawn_posix.py
+++ b/Lib/multiprocessing/popen_spawn_posix.py
@@ -57,6 +57,10 @@ def _launch(self, process_obj):
             self._fds.extend([child_r, child_w])
             self.pid = util.spawnv_passfds(spawn.get_executable(),
                                            cmd, self._fds)
+            os.close(child_r)
+            child_r = None
+            os.close(child_w)
+            child_w = None
             self.sentinel = parent_r
             with open(parent_w, 'wb', closefd=False) as f:
                 f.write(fp.getbuffer())

From 4c9fd26c35fed4f4bc57d6abacd565b1354efc05 Mon Sep 17 00:00:00 2001
From: Albert Zeyer <albzey@gmail.com>
Date: Mon, 13 May 2024 09:50:36 +0200
Subject: [PATCH 2/2] news

---
 .../next/Library/2024-05-13-09-50-31.gh-issue-118981.zgOQPv.rst | 2 ++
 1 file changed, 2 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Library/2024-05-13-09-50-31.gh-issue-118981.zgOQPv.rst

diff --git a/Misc/NEWS.d/next/Library/2024-05-13-09-50-31.gh-issue-118981.zgOQPv.rst b/Misc/NEWS.d/next/Library/2024-05-13-09-50-31.gh-issue-118981.zgOQPv.rst
new file mode 100644
index 00000000000000..72b9f6c9e4eb99
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2024-05-13-09-50-31.gh-issue-118981.zgOQPv.rst
@@ -0,0 +1,2 @@
+Fix potential hang in ``multiprocessing.popen_spawn_posix`` that can happen
+when the child proc dies early by closing the child fds right away.