STINNER Victor <[email protected]> added the comment:
I can reproduce the leak with command:
./python -m test -R 3:3 test_leak
File 1:
---
import unittest
import sys
from importlib import _bootstrap as BOOTSTRAP
def _save_and_remove_module(name, orig_modules):
"""Helper function to save and remove a module from sys.modules
Raise ImportError if the module can't be imported.
"""
# try to import the module and raise an error if it can't be imported
if name not in sys.modules:
__import__(name)
del sys.modules[name]
for modname in list(sys.modules):
if modname == name or modname.startswith(name + '.'):
orig_modules[modname] = sys.modules[modname]
del sys.modules[modname]
def _save_and_block_module(name, orig_modules):
"""Helper function to save and block a module in sys.modules
Return True if the module was in sys.modules, False otherwise.
"""
saved = True
try:
orig_modules[name] = sys.modules[name]
except KeyError:
saved = False
sys.modules[name] = None
return saved
def import_fresh_module():
name = 'importlib3'
fresh = ('importlib',)
blocked = ('_frozen_importlib', '_frozen_importlib_external')
orig_modules = {}
names_to_remove = []
_save_and_remove_module(name, orig_modules)
try:
for fresh_name in fresh:
_save_and_remove_module(fresh_name, orig_modules)
for blocked_name in blocked:
if not _save_and_block_module(blocked_name, orig_modules):
names_to_remove.append(blocked_name)
with BOOTSTRAP._ModuleLockManager(name):
spec = BOOTSTRAP._find_spec(name, None)
module = BOOTSTRAP.module_from_spec(spec)
sys.modules[spec.name] = module
spec.loader.exec_module(module)
del sys.modules[spec.name]
finally:
for orig_name, module in orig_modules.items():
sys.modules[orig_name] = module
for name_to_remove in names_to_remove:
del sys.modules[name_to_remove]
class Tests(unittest.TestCase):
def test_import_fresh(self):
import_fresh_module()
---
File 2: Lib/importlib3.py
---
import _imp
import sys
try:
import _frozen_importlib as _bootstrap
case = 1
except ImportError:
case = 2
if case == 2:
_bootstrap = type(sys)("_bootstrap")
_bootstrap._weakref = sys.modules['_weakref']
class ModuleSpec:
@staticmethod
def method():
pass
spec = ModuleSpec()
spec.name = "_weakref"
module = _imp.create_builtin(spec)
module.__spec__ = spec
sys.modules["_weakref"] = module
---
----------
_______________________________________
Python tracker <[email protected]>
<https://bugs.python.org/issue40050>
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