https://github.com/python/cpython/commit/93e2c7703c5a3c98a9a7d6bf4dcab4aac0d27c6e
commit: 93e2c7703c5a3c98a9a7d6bf4dcab4aac0d27c6e
branch: main
author: Iaroslav <[email protected]>
committer: kumaraditya303 <[email protected]>
date: 2026-07-31T13:06:47Z
summary:
gh-154791: Fix asyncio.Future losing traceback on repeated result() call
(#154798)
files:
A Misc/NEWS.d/next/Library/2026-07-28-08-02-41.gh-issue-154791.ey7POa.rst
M Lib/test/test_asyncio/test_futures2.py
M Modules/_asynciomodule.c
diff --git a/Lib/test/test_asyncio/test_futures2.py
b/Lib/test/test_asyncio/test_futures2.py
index cf90835ce87cc30..1878cf8adf63a3b 100644
--- a/Lib/test/test_asyncio/test_futures2.py
+++ b/Lib/test/test_asyncio/test_futures2.py
@@ -28,6 +28,26 @@ async def raise_exc():
else:
self.fail('TypeError was not raised')
+ async def test_future_traceback_preserved_after_suppress(self):
+ async def raise_exc():
+ raise TypeError(42)
+
+ future = self.cls(raise_exc())
+ try:
+ await future
+ except TypeError:
+ pass
+
+ try:
+ await future
+ except TypeError as e:
+ tb = ''.join(traceback.format_tb(e.__traceback__))
+ self.assertIn('raise_exc', tb,
+ 'Original raise site lost after first result() call')
+ else:
+ self.fail('TypeError was not raised')
+
+
async def test_task_exc_handler_correct_context(self):
# see https://github.com/python/cpython/issues/96704
name = contextvars.ContextVar('name', default='foo')
diff --git
a/Misc/NEWS.d/next/Library/2026-07-28-08-02-41.gh-issue-154791.ey7POa.rst
b/Misc/NEWS.d/next/Library/2026-07-28-08-02-41.gh-issue-154791.ey7POa.rst
new file mode 100644
index 000000000000000..35008e35314b907
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-07-28-08-02-41.gh-issue-154791.ey7POa.rst
@@ -0,0 +1,5 @@
+Fix :class:`asyncio.Future` (C implementation) losing the initial exception
+traceback frames when ``Future.result()`` is called more than once. Previously,
+the C implementation cleared the stored traceback after the first call, causing
+subsequent raises to omit the original raise site. The pure-Python
+implementation was unaffected.
diff --git a/Modules/_asynciomodule.c b/Modules/_asynciomodule.c
index 0cd41d0b4c4d0dc..ec6f35f161136c1 100644
--- a/Modules/_asynciomodule.c
+++ b/Modules/_asynciomodule.c
@@ -769,7 +769,6 @@ future_get_result(asyncio_state *state, FutureObj *fut,
PyObject **result)
return -1;
}
*result = Py_NewRef(fut->fut_exception);
- Py_CLEAR(fut->fut_exception_tb);
return 1;
}
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