From 54aecd29cf824fdef79a151e72873c72bfad5247 Mon Sep 17 00:00:00 2001
From: Marc Buerg <buermarc2@gmail.com>
Date: Fri, 22 Sep 2023 22:02:54 +0200
Subject: [PATCH] gh-38807: fix race condition in Lib/trace.py

Instead of checking if a directory does not exist and thereafter
creating it, directly call `os.makedirs` with the `exist_ok` kwarg.
---
 Lib/trace.py                                                   | 3 +--
 .../next/Library/2023-09-22-22-17-45.gh-issue-38807.m9McRN.rst | 3 +++
 2 files changed, 4 insertions(+), 2 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Library/2023-09-22-22-17-45.gh-issue-38807.m9McRN.rst

diff --git a/Lib/trace.py b/Lib/trace.py
index fb9a423ea09fce..761916b18097d6 100755
--- a/Lib/trace.py
+++ b/Lib/trace.py
@@ -258,8 +258,7 @@ def write_results(self, show_missing=True, summary=False, coverdir=None):
                 modulename = _modname(filename)
             else:
                 dir = coverdir
-                if not os.path.exists(dir):
-                    os.makedirs(dir)
+                os.makedirs(dir, exist_ok=True)
                 modulename = _fullmodname(filename)
 
             # If desired, get a list of the line numbers which represent
diff --git a/Misc/NEWS.d/next/Library/2023-09-22-22-17-45.gh-issue-38807.m9McRN.rst b/Misc/NEWS.d/next/Library/2023-09-22-22-17-45.gh-issue-38807.m9McRN.rst
new file mode 100644
index 00000000000000..4219723d15b9e6
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2023-09-22-22-17-45.gh-issue-38807.m9McRN.rst
@@ -0,0 +1,3 @@
+Fix race condition in :mod:`trace`. Instead of checking if a directory
+exists and creating it, directly call :func:`os.makedirs` with the kwarg
+``exist_ok=True``.