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[3.14] GH-100964: Fix reference cycle in exhausted generator frames (GH-141112) (#142902)

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GH-100964: Fix reference cycle in exhausted generator frames (GH-141112)
(cherry picked from commit 92243dc62c)

Co-authored-by: Savannah Ostrowski <savannah@python.org>
This commit is contained in:
Miss Islington (bot) 2025-12-17 20:48:18 +01:00 • committed by GitHub
parent 25a94708e5
commit 7134b407dc
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3 changed files with 14 additions and 1 deletions
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12
Lib/test/test_generators.py
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@ -134,6 +134,18 @@ def gen():
self.assertEqual(len(resurrected), 1)
self.assertIsInstance(resurrected[0].gi_code, types.CodeType)
def test_exhausted_generator_frame_cycle(self):
def g():
yield
generator = g()
frame = generator.gi_frame
self.assertIsNone(frame.f_back)
next(generator)
self.assertIsNone(frame.f_back)
next(generator, None)
self.assertIsNone(frame.f_back)
class GeneratorTest(unittest.TestCase):

1
Misc/NEWS.d/next/Core_and_Builtins/2025-11-06-05-21-25.gh-issue-100964.TxPf1b.rst Normal file
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@ -0,0 +1 @@
Fix reference cycle in exhausted generator frames. Patch by Savannah Ostrowski.

2
Python/ceval.c
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@ -1920,9 +1920,9 @@ clear_gen_frame(PyThreadState *tstate, _PyInterpreterFrame * frame)
tstate->exc_info = gen->gi_exc_state.previous_item;
gen->gi_exc_state.previous_item = NULL;
assert(frame->frame_obj == NULL || frame->frame_obj->f_frame == frame);
frame->previous = NULL;
_PyFrame_ClearExceptCode(frame);
_PyErr_ClearExcState(&gen->gi_exc_state);
frame->previous = NULL;
}
void