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[3.13] gh-58956: Fix a frame refleak in bdb (GH-128190) (#128947)

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* gh-58956: Fix a frame refleak in bdb (GH-128190)
(cherry picked from commit 767c89ba7c)

Co-authored-by: Tian Gao <gaogaotiantian@hotmail.com>
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Miss Islington (bot) 2025-01-17 18:49:15 +01:00 • committed by GitHub
parent 9974e7185d
commit dc77f1914d
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51
Lib/test/test_pdb.py
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@ -2810,6 +2810,57 @@ def test_pdb_f_trace_lines():
(Pdb) continue
"""
def test_pdb_frame_refleak():
"""
pdb should not leak reference to frames
>>> def frame_leaker(container):
... import sys
... container.append(sys._getframe())
... import pdb; pdb.Pdb(nosigint=True, readrc=False).set_trace()
... pass
>>> def test_function():
... import gc
... container = []
... frame_leaker(container) # c
... print(len(gc.get_referrers(container[0])))
... container = []
... frame_leaker(container) # n c
... print(len(gc.get_referrers(container[0])))
... container = []
... frame_leaker(container) # r c
... print(len(gc.get_referrers(container[0])))
>>> with PdbTestInput([ # doctest: +NORMALIZE_WHITESPACE
... 'continue',
... 'next',
... 'continue',
... 'return',
... 'continue',
... ]):
... test_function()
> <doctest test.test_pdb.test_pdb_frame_refleak[0]>(4)frame_leaker()
-> import pdb; pdb.Pdb(nosigint=True, readrc=False).set_trace()
(Pdb) continue
1
> <doctest test.test_pdb.test_pdb_frame_refleak[0]>(4)frame_leaker()
-> import pdb; pdb.Pdb(nosigint=True, readrc=False).set_trace()
(Pdb) next
> <doctest test.test_pdb.test_pdb_frame_refleak[0]>(5)frame_leaker()
-> pass
(Pdb) continue
1
> <doctest test.test_pdb.test_pdb_frame_refleak[0]>(4)frame_leaker()
-> import pdb; pdb.Pdb(nosigint=True, readrc=False).set_trace()
(Pdb) return
--Return--
> <doctest test.test_pdb.test_pdb_frame_refleak[0]>(5)frame_leaker()->None
-> pass
(Pdb) continue
1
"""
def test_pdb_function_break():
"""Testing the line number of break on function