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[3.13] GH-100964: Fix reference cycle in exhausted generator frames (G… (#142904)

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* [3.13] 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:
Savannah Ostrowski 2025-12-17 12:04:53 -08:00 • committed by GitHub
parent db552ddb1e
commit 8f7c4f1cef
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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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@ -112,6 +112,18 @@ def g3(): return (yield from f())
gen.send(2)
self.assertEqual(cm.exception.value, 2)
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
View file

@ -1696,10 +1696,10 @@ clear_gen_frame(PyThreadState *tstate, _PyInterpreterFrame * frame)
gen->gi_exc_state.previous_item = NULL;
tstate->c_recursion_remaining--;
assert(frame->frame_obj == NULL || frame->frame_obj->f_frame == frame);
frame->previous = NULL;
_PyFrame_ClearExceptCode(frame);
_PyErr_ClearExcState(&gen->gi_exc_state);
tstate->c_recursion_remaining++;
frame->previous = NULL;
}
void