Log RecursionError out as warning during inference

doc/whatsnew/fragments/9139.bugfix

@@ -0,0 +1,3 @@
+Log RecursionError out as warning during inference.
+
+Closes #9139

pylint/checkers/base/basic_checker.py

@@ -374,6 +374,9 @@
                     call_inferred = list(inferred.infer_call_result(node))
             except astroid.InferenceError:
                 call_inferred = None
+            except RecursionError:
+                utils.warn_on_recursion_error()
+                call_inferred = None
             if call_inferred:
                 self.add_message(
                     "missing-parentheses-for-call-in-test",
@@ -608,6 +611,9 @@
                 value = next(default.infer())
             except astroid.InferenceError:
                 continue
+            except RecursionError:
+                utils.warn_on_recursion_error()
+                continue
 
             if (
                 isinstance(value, astroid.Instance)
@@ -839,6 +845,9 @@
                         func = next(node.args[0].func.infer())
                     except astroid.InferenceError:
                         return
+                    except RecursionError:
+                        utils.warn_on_recursion_error()
+                        return
                     if getattr(
                         func, "name", None
                     ) == "iter" and utils.is_builtin_object(func):

pylint/checkers/base/comparison_checker.py

@@ -148,7 +148,7 @@ def _is_float_nan(node: nodes.NodeNG) -> bool:
                 if isinstance(node, nodes.Call) and len(node.args) == 1:
                     if (
                         node.args[0].value.lower() == "nan"
-                        and node.inferred()[0].pytype() == "builtins.float"
+                        and utils.safe_infer(node).pytype() == "builtins.float"
                     ):
                         return True
                 return False

pylint/checkers/classes/class_checker.py

@@ -252,9 +252,12 @@
         if is_same_fn is None:
             # If the default value comparison is unhandled, assume the value is different
             return True
-        if not is_same_fn(original_default, overridden_default):
-            # Two args with same type but different values
-            return True
+        try:
+            if not is_same_fn(original_default, overridden_default):
+                # Two args with same type but different values
+                return True
+        except RecursionError:
+            utils.warn_on_recursion_error()
     return False
 
 
@@ -409,6 +412,9 @@
         except astroid.InferenceError:
             # Can't infer, avoid emitting a false positive in this case.
             return True
+        except RecursionError:
+            utils.warn_on_recursion_error()
+            return True
     return False
 
 
@@ -435,6 +441,9 @@
                     bound = next(call.func.infer())
                 except (astroid.InferenceError, StopIteration):
                     continue
+                except RecursionError:
+                    utils.warn_on_recursion_error()
+                    continue
                 if not isinstance(bound, astroid.BoundMethod):
                     continue
                 func_obj = bound._proxied
@@ -466,6 +475,9 @@
             inferred = next(attr.infer())
         except astroid.InferenceError:
             continue
+        except RecursionError:
+            utils.warn_on_recursion_error()
+            continue
         if isinstance(inferred, nodes.FunctionDef) and decorated_with_property(
             inferred
         ):
@@ -483,7 +495,11 @@
 def _has_same_layout_slots(
     slots: list[nodes.Const | None], assigned_value: nodes.Name
 ) -> bool:
-    inferred = next(assigned_value.infer())
+    try:
+        inferred = next(assigned_value.infer())
+    except RecursionError:
+        utils.warn_on_recursion_error()
+        return False
     if isinstance(inferred, nodes.ClassDef):
         other_slots = inferred.slots()
         if all(
@@ -1216,7 +1232,7 @@
                                 "attribute-defined-outside-init", args=attr, node=node
                             )
 
-    # pylint: disable = too-many-branches
+    # pylint: disable = too-many-branches, too-many-return-statements
     def visit_functiondef(self, node: nodes.FunctionDef) -> None:
         """Check method arguments, overriding."""
         # ignore actual functions
@@ -1278,6 +1294,9 @@
                         inferred = next(inferred.infer_call_result(inferred))
                     except astroid.InferenceError:
                         return
+                    except RecursionError:
+                        utils.warn_on_recursion_error()
+                        return
                 try:
                     if (
                         isinstance(inferred, (astroid.Instance, nodes.ClassDef))
@@ -1513,6 +1532,9 @@
                     self._check_slots_elt(elt, node)
                 except astroid.InferenceError:
                     continue
+                except RecursionError:
+                    utils.warn_on_recursion_error()
+                    continue
             self._check_redefined_slots(node, slots, values)
 
     def _check_redefined_slots(
@@ -2196,6 +2218,9 @@
                             )
             except astroid.InferenceError:
                 continue
+            except RecursionError:
+                utils.warn_on_recursion_error()
+                continue
         for klass, method in not_called_yet.items():
             # Check if the init of the class that defines this init has already
             # been called.
@@ -2350,4 +2375,7 @@
             to_call[base_node] = init_node
         except astroid.InferenceError:
             continue
+        except RecursionError:
+            utils.warn_on_recursion_error()
+            continue
     return to_call

pylint/checkers/classes/special_methods_checker.py

@@ -21,6 +21,7 @@
     is_function_body_ellipsis,
     only_required_for_messages,
     safe_infer,
+    warn_on_recursion_error,
 )
 from pylint.lint.pylinter import PyLinter
 
@@ -44,13 +45,19 @@
         return None  # inference failed
     except StopIteration:
         return None  # no values inferred
+    except RecursionError:
+        warn_on_recursion_error()
+        return None
     try:
         next(inferit)
         return None  # there is ambiguity on the inferred node
     except astroid.InferenceError:
         return None  # there is some kind of ambiguity
     except StopIteration:
         return value
+    except RecursionError:
+        warn_on_recursion_error()
+        return value
 
 
 class SpecialMethodsChecker(BaseChecker):

pylint/checkers/newstyle.py

@@ -16,6 +16,7 @@
     has_known_bases,
     node_frame_class,
     only_required_for_messages,
+    warn_on_recursion_error,
 )
 from pylint.typing import MessageDefinitionTuple
 
@@ -107,6 +108,9 @@
                     supcls = call.args and next(call.args[0].infer(), None)
                 except astroid.InferenceError:
                     continue
+                except RecursionError:
+                    warn_on_recursion_error()
+                    continue
 
                 # If the supcls is in the ancestors of klass super can be used to skip
                 # a step in the mro() and get a method from a higher parent

pylint/checkers/refactoring/implicit_booleaness_checker.py

@@ -144,6 +144,9 @@
         except astroid.InferenceError:
             # Probably undefined-variable, abort check
             return
+        except RecursionError:
+            utils.warn_on_recursion_error()
+            return
         mother_classes = self.base_names_of_instance(instance)
         affected_by_pep8 = any(
             t in mother_classes for t in ("str", "tuple", "list", "set")

pylint/checkers/refactoring/refactoring_checker.py

@@ -20,7 +20,7 @@
 from pylint import checkers
 from pylint.checkers import utils
 from pylint.checkers.base.basic_error_checker import _loop_exits_early
-from pylint.checkers.utils import node_frame_class
+from pylint.checkers.utils import node_frame_class, safe_infer
 from pylint.interfaces import HIGH, INFERENCE, Confidence
 
 if TYPE_CHECKING:
@@ -1997,7 +1997,7 @@ def _is_node_return_ended(self, node: nodes.NodeNG) -> bool:
             return True
         if isinstance(node, nodes.Call):
             try:
-                funcdef_node = node.func.inferred()[0]
+                funcdef_node = safe_infer(node.func)
                 if self._is_function_def_never_returning(funcdef_node):
                     return True
             except astroid.InferenceError:

pylint/checkers/stdlib.py

@@ -592,6 +592,8 @@
             confidence = INFERENCE
         try:
             inferred_args = arg.inferred()
+        except RecursionError:
+            utils.warn_on_recursion_error()
         except astroid.InferenceError:
             return
         for inferred in inferred_args:
@@ -713,6 +715,8 @@
                         break
             except astroid.InferenceError:
                 pass
+            except RecursionError:
+                utils.warn_on_recursion_error()
         for lru_cache_node in lru_cache_nodes:
             self.add_message(
                 "method-cache-max-size-none",
@@ -767,6 +771,9 @@
             inferred = next(node.infer())
         except astroid.InferenceError:
             return
+        except RecursionError:
+            utils.warn_on_recursion_error()
+            return
         if isinstance(inferred, astroid.Instance) and inferred.qname() in {
             "_pydatetime.time",
             "datetime.time",

pylint/checkers/strings.py

@@ -470,6 +470,9 @@
             strnode = next(func.bound.infer())
         except astroid.InferenceError:
             return
+        except RecursionError:
+            utils.warn_on_recursion_error()
+            return
         if not (isinstance(strnode, nodes.Const) and isinstance(strnode.value, str)):
             return
         try:
@@ -634,6 +637,9 @@
                 except astroid.InferenceError:
                     # can't check further if we can't infer it
                     break
+                except RecursionError:
+                    utils.warn_on_recursion_error()
+                    break
 
 
 class StringConstantChecker(BaseTokenChecker, BaseRawFileChecker):

pylint/checkers/typecheck.py

@@ -48,6 +48,7 @@
     supports_getitem,
     supports_membership_test,
     supports_setitem,
+    warn_on_recursion_error,
 )
 from pylint.constants import PY310_PLUS
 from pylint.interfaces import HIGH, INFERENCE
@@ -793,6 +794,9 @@
         inferred = next(func.infer_call_result(func, context), None)
     except astroid.InferenceError:
         return None
+    except RecursionError:
+        utils.warn_on_recursion_error()
+        return None
     return inferred or None
 
 
@@ -1087,6 +1091,9 @@
 
         try:
             inferred = list(node.expr.infer())
+        except RecursionError:
+            warn_on_recursion_error()
+            return
         except astroid.InferenceError:
             return
 
@@ -1359,6 +1366,9 @@
                     call_results = list(attr.infer_call_result(node))
                 except astroid.InferenceError:
                     continue
+                except RecursionError:
+                    utils.warn_on_recursion_error()
+                    continue
 
                 if all(
                     isinstance(return_node, util.UninferableBase)
@@ -1651,6 +1661,7 @@
                     confidence=INFERENCE,
                 )
 
+    # pylint: disable=too-many-try-statements
     @staticmethod
     def _keyword_argument_is_in_all_decorator_returns(
         func: nodes.FunctionDef, keyword: str
@@ -1673,21 +1684,24 @@
             if not isinstance(inferred, nodes.FunctionDef):
                 return False
 
-            for return_value in inferred.infer_call_result(caller=None):
-                # infer_call_result() returns nodes.Const.None for None return values
-                # so this also catches non-returning decorators
-                if not isinstance(return_value, nodes.FunctionDef):
-                    return False
-
-                # If the return value uses a kwarg the keyword will be consumed
-                if return_value.args.kwarg:
-                    continue
+            try:
+                for return_value in inferred.infer_call_result(caller=None):
+                    # infer_call_result() returns nodes.Const.None for None return values
+                    # so this also catches non-returning decorators
+                    if not isinstance(return_value, nodes.FunctionDef):
+                        return False
+
+                    # If the return value uses a kwarg the keyword will be consumed
+                    if return_value.args.kwarg:
+                        continue
 
-                # Check if the keyword is another type of argument
-                if return_value.args.is_argument(keyword):
-                    continue
+                    # Check if the keyword is another type of argument
+                    if return_value.args.is_argument(keyword):
+                        continue
 
-                return False
+                    return False
+            except RecursionError:
+                utils.warn_on_recursion_error()
 
         return True