From d4f0ef704119ce154b9d569ce4536b312b00880e Mon Sep 17 00:00:00 2001
From: Marc Mueller <30130371+cdce8p@users.noreply.github.com>
Date: Fri, 23 Feb 2024 00:19:27 +0100
Subject: [PATCH] Catch ValueError - generator already executing (#9454)

---
 .pyenchant_pylint_custom_dict.txt  |  1 +
 doc/whatsnew/fragments/9138.bugfix |  4 ++++
 pylint/__init__.py                 | 21 +++++++++++++++++++++
 3 files changed, 26 insertions(+)
 create mode 100644 doc/whatsnew/fragments/9138.bugfix

diff --git a/.pyenchant_pylint_custom_dict.txt b/.pyenchant_pylint_custom_dict.txt
index 8a5f150739..712ab70cca 100644
--- a/.pyenchant_pylint_custom_dict.txt
+++ b/.pyenchant_pylint_custom_dict.txt
@@ -361,6 +361,7 @@ unicode
 Uninferable
 uninferable
 unittest
+unraisablehook
 untriggered
 # prefix for string
 ur
diff --git a/doc/whatsnew/fragments/9138.bugfix b/doc/whatsnew/fragments/9138.bugfix
new file mode 100644
index 0000000000..cc48d11ab0
--- /dev/null
+++ b/doc/whatsnew/fragments/9138.bugfix
@@ -0,0 +1,4 @@
+Catch incorrect ValueError ``"generator already executing"`` for Python 3.12.0 - 3.12.2.
+This is fixed upstream in Python 3.12.3.
+
+Closes #9138
diff --git a/pylint/__init__.py b/pylint/__init__.py
index cc0f609aac..75cf2b6ee4 100644
--- a/pylint/__init__.py
+++ b/pylint/__init__.py
@@ -95,4 +95,25 @@ def modify_sys_path() -> None:
         sys.path.pop(1)
 
 
+def _catch_valueerror(unraisable: sys.UnraisableHookArgs) -> None:  # pragma: no cover
+    """Overwrite sys.unraisablehook to catch incorrect ValueError.
+
+    Python 3.12 introduced changes that sometimes cause astroid to emit ValueErrors
+    with 'generator already executing'. Fixed in Python 3.12.3 and 3.13.
+
+    https://github.com/pylint-dev/pylint/issues/9138
+    """
+    if (
+        isinstance(unraisable.exc_value, ValueError)
+        and unraisable.exc_value.args[0] == "generator already executing"
+    ):
+        return
+
+    sys.__unraisablehook__(unraisable)
+
+
+if (3, 12, 0) <= sys.version_info[:3] < (3, 12, 3):
+    sys.unraisablehook = _catch_valueerror
+
+
 version = __version__