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[3.13] gh-118846: Fix free-threading test failures when run sequentially (GH-118864) (#118927)

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The free-threaded build currently immortalizes some objects once the
first thread is started. This can lead to test failures depending on the
order in which tests are run. This PR addresses those failures by
suppressing immortalization or skipping the affected tests.
(cherry picked from commit b309c8ebff)

Co-authored-by: Sam Gross <colesbury@gmail.com>
This commit is contained in:
Miss Islington (bot) 2024-05-10 22:50:59 +02:00 • committed by GitHub
parent b3074f0d5e
commit cceb758c78
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8 changed files with 35 additions and 6 deletions
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20
Lib/test/test_gc.py
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@ -3,7 +3,8 @@
from test import support
from test.support import (verbose, refcount_test,
cpython_only, requires_subprocess,
requires_gil_enabled)
requires_gil_enabled, suppress_immortalization,
Py_GIL_DISABLED)
from test.support.import_helper import import_module
from test.support.os_helper import temp_dir, TESTFN, unlink
from test.support.script_helper import assert_python_ok, make_script
@ -109,6 +110,7 @@ def test_tuple(self):
del l
self.assertEqual(gc.collect(), 2)
@suppress_immortalization()
def test_class(self):
class A:
pass
@ -117,6 +119,7 @@ class A:
del A
self.assertNotEqual(gc.collect(), 0)
@suppress_immortalization()
def test_newstyleclass(self):
class A(object):
pass
@ -133,6 +136,7 @@ class A:
del a
self.assertNotEqual(gc.collect(), 0)
@suppress_immortalization()
def test_newinstance(self):
class A(object):
pass
@ -219,6 +223,7 @@ class B(object):
self.fail("didn't find obj in garbage (finalizer)")
gc.garbage.remove(obj)
@suppress_immortalization()
def test_function(self):
# Tricky: f -> d -> f, code should call d.clear() after the exec to
# break the cycle.
@ -561,6 +566,7 @@ def test_get_referents(self):
self.assertEqual(gc.get_referents(1, 'a', 4j), [])
@suppress_immortalization()
def test_is_tracked(self):
# Atomic built-in types are not tracked, user-defined objects and
# mutable containers are.
@ -598,7 +604,9 @@ class UserFloatSlots(float):
class UserIntSlots(int):
__slots__ = ()
self.assertTrue(gc.is_tracked(gc))
if not Py_GIL_DISABLED:
# gh-117783: modules may be immortalized in free-threaded build
self.assertTrue(gc.is_tracked(gc))
self.assertTrue(gc.is_tracked(UserClass))
self.assertTrue(gc.is_tracked(UserClass()))
self.assertTrue(gc.is_tracked(UserInt()))
@ -1347,6 +1355,10 @@ def callback(ignored):
junk = []
i = 0
detector = GC_Detector()
if Py_GIL_DISABLED:
# The free-threaded build doesn't have multiple generations, so
# just trigger a GC manually.
gc.collect()
while not detector.gc_happened:
i += 1
if i > 10000:
@ -1415,6 +1427,10 @@ def __del__(self):
detector = GC_Detector()
junk = []
i = 0
if Py_GIL_DISABLED:
# The free-threaded build doesn't have multiple generations, so
# just trigger a GC manually.
gc.collect()
while not detector.gc_happened:
i += 1
if i > 10000: