Long arguments in a function cause a fatal error

[xiaxinmeng]

Long arguments in a function cause a fatal error for pylint. I am not sure whether this is a bug for pylint, CPython also reports a MemoryError, but not a fatal error.

pylint_example.py

def f(*args): 
	return len(args)
f(*([0]*(2**32+1)))

The expected behavior:

There should be no fatal errors.

The actual output

>> pylint pylint_example.py
************* Module pylint_example
Desktop/pylint_example.py:14:3: C0303: Trailing whitespace (trailing-whitespace)
Desktop/pylint_example.py:17:13: C0303: Trailing whitespace (trailing-whitespace)
Desktop/pylint_example.py:18:0: W0311: Bad indentation. Found 1 spaces, expected 4 (bad-indentation)
Desktop/pylint_example.py:61:0: C0305: Trailing newlines (trailing-newlines)
Desktop/pylint_example.py:1:0: C0114: Missing module docstring (missing-module-docstring)
Desktop/pylint_example.py:17:0: C0116: Missing function or method docstring (missing-function-docstring)
Desktop/pylint_example.py:17:0: C0103: Function name "f" doesn't conform to snake_case naming style (invalid-name)
Exception on node <Call l.19 at 0x7f8b272a9e90> in file '/home/xxm/Desktop/pylint_example.py'
Traceback (most recent call last):
  File "/home/xxm/.local/lib/python3.11/site-packages/pylint/utils/ast_walker.py", line 91, in walk
    callback(astroid)
  File "/home/xxm/.local/lib/python3.11/site-packages/pylint/checkers/method_args.py", line 73, in visit_call
    self._check_missing_timeout(node)
  File "/home/xxm/.local/lib/python3.11/site-packages/pylint/checkers/method_args.py", line 83, in _check_missing_timeout
    call_site = arguments.CallSite.from_call(node)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/xxm/.local/lib/python3.11/site-packages/astroid/arguments.py", line 67, in from_call
    return cls(callcontext, context=context)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/xxm/.local/lib/python3.11/site-packages/astroid/arguments.py", line 45, in __init__
    self._unpacked_args = self._unpack_args(args, context=context)
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/xxm/.local/lib/python3.11/site-packages/astroid/arguments.py", line 126, in _unpack_args
    inferred = safe_infer(arg.value, context=context)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/xxm/.local/lib/python3.11/site-packages/astroid/helpers.py", line 171, in safe_infer
    value = next(inferit)
            ^^^^^^^^^^^^^
  File "/home/xxm/.local/lib/python3.11/site-packages/astroid/nodes/node_ng.py", line 179, in infer
    for i, result in enumerate(self._infer(context=context, **kwargs)):
  File "/home/xxm/.local/lib/python3.11/site-packages/astroid/decorators.py", line 71, in inner
    yield next(generator)
          ^^^^^^^^^^^^^^^
  File "/home/xxm/.local/lib/python3.11/site-packages/astroid/decorators.py", line 49, in wrapped
    for res in _func(node, context, **kwargs):
  File "/home/xxm/.local/lib/python3.11/site-packages/astroid/inference.py", line 567, in _filter_operation_errors
    for result in infer_callable(self, context):
  File "/home/xxm/.local/lib/python3.11/site-packages/astroid/inference.py", line 987, in _infer_binop
    yield from _infer_binary_operation(lhs, rhs, self, context, _get_binop_flow)
  File "/home/xxm/.local/lib/python3.11/site-packages/astroid/inference.py", line 936, in _infer_binary_operation
    results = list(method())
              ^^^^^^^^^^^^^^
  File "/home/xxm/.local/lib/python3.11/site-packages/astroid/decorators.py", line 71, in inner
    yield next(generator)
          ^^^^^^^^^^^^^^^
  File "/home/xxm/.local/lib/python3.11/site-packages/astroid/protocols.py", line 224, in tl_infer_binary_op
    yield _multiply_seq_by_int(self, opnode, other, context)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/xxm/.local/lib/python3.11/site-packages/astroid/protocols.py", line 175, in _multiply_seq_by_int
    node.elts = list(filtered_elts) * other.value
                ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
MemoryError
Desktop/pylint_example.py:1:0: F0002: /home/xxm/Desktop/pylint_example.py: Fatal error while checking '/home/xxm/Desktop/pylint_example.py'. Please open an issue in our bug tracker so we address this. There is a pre-filled template that you can use in '/home/xxm/.cache/pylint/pylint-crash-2023-06-07-13-30-48.txt'. (astroid-error)

------------------------------------------------------------------
Your code has been rated at 0.00/10 (previous run: 0.00/10, +0.00)

Test Environment

pylint 3.0.0b1
astroid 3.0.0a5-dev0
Python 3.11.3
Ubuntu 18.04

[jacobtylerwalls]

Thanks for the report. safe_infer could catch MemoryError, or we could add some sort of clever guard like #6745, but I would be weary of accumulating too many clever guards all over.

[jacobtylerwalls]

One more clever guard is okay. See pylint-dev/astroid#2228