commit cbc46afa59dcc43c2c8c90ae7a0a0dc404325a89
author Mariatta <Mariatta@users.noreply.github.com> Thu Apr 13 19:26:16 2017 -0700
committer GitHub <noreply@github.com> Thu Apr 13 19:26:16 2017 -0700
tree 44df38cbed9accd263365cb2eb250bcc7b16dcef
parent 2cdf087d1fd48f7d0f95b5a0b31b9a624fa84751

[3.6] bpo-29694: race condition in pathlib mkdir with flags parents=True (GH-1089). (GH-1126)

(cherry picked from commit 22a594a0047d7706537ff2ac676cdc0f1dcb329c)

Lib/pathlib.py

diff --git a/Lib/pathlib.py b/Lib/pathlib.py
index 8c1cb96..70f5cba 100644
--- a/Lib/pathlib.py
+++ b/Lib/pathlib.py
@@ -1230,8 +1230,8 @@
         except FileNotFoundError:
             if not parents or self.parent == self:
                 raise
-            self.parent.mkdir(parents=True)
-            self._accessor.mkdir(self, mode)
+            self.parent.mkdir(parents=True, exist_ok=True)
+            self.mkdir(mode, parents=False, exist_ok=exist_ok)
         except OSError:
             # Cannot rely on checking for EEXIST, since the operating system
             # could give priority to other errors like EACCES or EROFS