Crash "Fatal error while checking" with metaclass #8698
Description
Bug description
When parsing the following file:
"""Fatal error while checking.""" class Meta(type(object), type(object)): pass class Class(metaclass=Meta): passpylint crashed with a AstroidError and with the following stacktrace:
Traceback (most recent call last): File "C:\Users\bers\.pyenv-win-venv\envs\project_3.11\Lib\site-packages\pylint\lint\pylinter.py", line 811, in _lint_file check_astroid_module(module) File "C:\Users\bers\.pyenv-win-venv\envs\project_3.11\Lib\site-packages\pylint\lint\pylinter.py", line 1085, in check_astroid_module retval = self._check_astroid_module( ^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\bers\.pyenv-win-venv\envs\project_3.11\Lib\site-packages\pylint\lint\pylinter.py", line 1135, in _check_astroid_module walker.walk(node) File "C:\Users\bers\.pyenv-win-venv\envs\project_3.11\Lib\site-packages\pylint\utils\ast_walker.py", line 94, in walk self.walk(child) File "C:\Users\bers\.pyenv-win-venv\envs\project_3.11\Lib\site-packages\pylint\utils\ast_walker.py", line 91, in walk callback(astroid) File "C:\Users\bers\.pyenv-win-venv\envs\project_3.11\Lib\site-packages\pylint\checkers\typecheck.py", line 1040, in visit_classdef if _is_invalid_metaclass(metaclass): ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\bers\.pyenv-win-venv\envs\project_3.11\Lib\site-packages\pylint\checkers\typecheck.py", line 748, in _is_invalid_metaclass mro = metaclass.mro() ^^^^^^^^^^^^^^^ File "C:\Users\bers\.pyenv-win-venv\envs\project_3.11\Lib\site-packages\astroid\nodes\scoped_nodes\scoped_nodes.py", line 3066, in mro return self._compute_mro(context=context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\bers\.pyenv-win-venv\envs\project_3.11\Lib\site-packages\astroid\nodes\scoped_nodes\scoped_nodes.py", line 3054, in _compute_mro unmerged_mro = list(clean_duplicates_mro(unmerged_mro, self, context)) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\bers\.pyenv-win-venv\envs\project_3.11\Lib\site-packages\astroid\nodes\scoped_nodes\scoped_nodes.py", line 155, in clean_duplicates_mro raise DuplicateBasesError( astroid.exceptions.DuplicateBasesError: Duplicates found in MROs (Meta), (type, object), (type, object), (type, type) for <ClassDef.Meta l.2 at 0x26ca8902bd0>. The above exception was the direct cause of the following exception: Traceback (most recent call last): File "C:\Users\bers\.pyenv-win-venv\envs\project_3.11\Lib\site-packages\pylint\lint\pylinter.py", line 775, in _lint_files self._lint_file(fileitem, module, check_astroid_module) File "C:\Users\bers\.pyenv-win-venv\envs\project_3.11\Lib\site-packages\pylint\lint\pylinter.py", line 813, in _lint_file raise astroid.AstroidError from e astroid.exceptions.AstroidError Configuration
No response
Command used
pylint bug.pyPylint output
************* Module bug bug.py:2:0: C0115: Missing class docstring (missing-class-docstring) bug.py:2:0: E0241: Duplicate bases for class 'Meta' (duplicate-bases) bug.py:5:0: C0115: Missing class docstring (missing-class-docstring) Exception on node <ClassDef.Class l.5 at 0x26ca8903410> in file 'C:\Code\Bug\bug.py' Traceback (most recent call last): File "C:\Users\bers\.pyenv-win-venv\envs\project_3.11\Lib\site-packages\pylint\utils\ast_walker.py", line 91, in walk callback(astroid) File "C:\Users\bers\.pyenv-win-venv\envs\project_3.11\Lib\site-packages\pylint\checkers\typecheck.py", line 1040, in visit_classdef if _is_invalid_metaclass(metaclass): ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\bers\.pyenv-win-venv\envs\project_3.11\Lib\site-packages\pylint\checkers\typecheck.py", line 748, in _is_invalid_metaclass mro = metaclass.mro() ^^^^^^^^^^^^^^^ File "C:\Users\bers\.pyenv-win-venv\envs\project_3.11\Lib\site-packages\astroid\nodes\scoped_nodes\scoped_nodes.py", line 3066, in mro return self._compute_mro(context=context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\bers\.pyenv-win-venv\envs\project_3.11\Lib\site-packages\astroid\nodes\scoped_nodes\scoped_nodes.py", line 3054, in _compute_mro unmerged_mro = list(clean_duplicates_mro(unmerged_mro, self, context)) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\bers\.pyenv-win-venv\envs\project_3.11\Lib\site-packages\astroid\nodes\scoped_nodes\scoped_nodes.py", line 155, in clean_duplicates_mro raise DuplicateBasesError( astroid.exceptions.DuplicateBasesError: Duplicates found in MROs (Meta), (type, object), (type, object), (type, type) for <ClassDef.Meta l.2 at 0x26ca8902bd0>. bug.py:1:0: F0002: bug.py: Fatal error while checking 'bug.py'. Please open an issue in our bug tracker so we address this. There is a pre-filled template that you can use in 'C:\Users\bers\AppData\Local\pylint\pylint\Cache\pylint-crash-2023-05-18-09-05-35.txt'. (astroid-error) ------------------------------------------------------------------ Your code has been rated at 0.00/10 (previous run: 7.14/10, -7.14)Expected behavior
I have no idea if the code examples makes any sense, but pylint should not crash.
Pylint version
pylint 2.17.4 astroid 2.15.5 Python 3.11.3 (tags/v3.11.3:f3909b8, Apr 4 2023, 23:49:59) [MSC v.1934 64 bit (AMD64)]OS / Environment
Windows 10 21H2
Additional dependencies
No response