From: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>
Date: Mon, 24 Oct 2022 18:08:22 +0000 (-0700)
Subject: [3.11] GH-98543: Fix `asyncio.TaskGroup`  to not keep reference to errors after raisi... 
X-Git-Tag: v3.11.1~221
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=36d25a4f7f8263cac9f8609e0347d4060d1dce3b;p=thirdparty%2FPython%2Fcpython.git

[3.11] GH-98543: Fix `asyncio.TaskGroup`  to not keep reference to errors after raising ExceptionGroup  (GH-98544) (#98550)

GH-98543: Fix `asyncio.TaskGroup`  to not keep reference to errors after raising ExceptionGroup  (GH-98544)
(cherry picked from commit f4a14941e6e54b15012fca067f6a9b2ff29f201a)

Co-authored-by: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com>
---

diff --git a/Lib/asyncio/taskgroups.py b/Lib/asyncio/taskgroups.py
index 5d5e2a8a85dd..911419e1769c 100644
--- a/Lib/asyncio/taskgroups.py
+++ b/Lib/asyncio/taskgroups.py
@@ -128,11 +128,11 @@ class TaskGroup:
             # Exceptions are heavy objects that can have object
             # cycles (bad for GC); let's not keep a reference to
             # a bunch of them.
-            errors = self._errors
-            self._errors = None
-
-            me = BaseExceptionGroup('unhandled errors in a TaskGroup', errors)
-            raise me from None
+            try:
+                me = BaseExceptionGroup('unhandled errors in a TaskGroup', self._errors)
+                raise me from None
+            finally:
+                self._errors = None
 
     def create_task(self, coro, *, name=None, context=None):
         if not self._entered: