Import upstream CPython branch '3.14'

Summary:
Python `3.14.0rc2+` (`3.14`) was **published** on 2025-08-22 14:27:49+00:00.

# Commit Info

Base: (`3.14.0rc2+`) - `57c46013e352aa59c02701a0e6e43ddcb6a6095c` (commit date: 2025-08-22 08:11:38+00:00)
Imported: (`3.14.0rc2+`) - `3.14` (commit date: 2025-08-22 14:27:49+00:00)

# Files added

```
Misc/NEWS.d/next/Core_and_Builtins/2025-08-22-11-39-40.gh-issue-137384.j4b_in.rst
```

Reviewed By: itamaro

Differential Revision: D80876028

fbshipit-source-id: 6075f686511b31e90cc99b9a84f9d84a0f868936

Author: generatedunixname1734921407115435

.github/workflows/tail-call.yml

@@ -114,8 +114,8 @@ jobs:
           find /usr/local/bin -lname '*/Library/Frameworks/Python.framework/*' -delete
           brew install llvm@${{ matrix.llvm }}
           export SDKROOT="$(xcrun --show-sdk-path)"
-          export PATH="/usr/local/opt/llvm/bin:$PATH"
-          export PATH="/opt/homebrew/opt/llvm/bin:$PATH"
+          export PATH="/usr/local/opt/llvm@${{ matrix.llvm }}/bin:$PATH"
+          export PATH="/opt/homebrew/opt/llvm@${{ matrix.llvm }}/bin:$PATH"
           CC=clang-20 ./configure --with-tail-call-interp
           make all --jobs 4
           ./python.exe -m test --multiprocess 0 --timeout 4500 --verbose2 --verbose3

Lib/test/test_gc.py

@@ -1522,6 +1522,19 @@ def test_ast_fini(self):
         """)
         assert_python_ok("-c", code)
 
+    def test_warnings_fini(self):
+        # See https://github.com/python/cpython/issues/137384
+        code = textwrap.dedent('''
+            import asyncio
+            from contextvars import ContextVar
+
+            context_loop = ContextVar("context_loop", default=None)
+            loop = asyncio.new_event_loop()
+            context_loop.set(loop)
+        ''')
+
+        assert_python_ok("-c", code)
+
 
 def setUpModule():
     global enabled, debug

Misc/NEWS.d/next/Core_and_Builtins/2025-08-22-11-39-40.gh-issue-137384.j4b_in.rst

@@ -0,0 +1 @@
+Fix a crash when using the :mod:`warnings` module in a finalizer at shutdown. Patch by Kumar Aditya.

Python/pystate.c

@@ -914,7 +914,6 @@ interpreter_clear(PyInterpreterState *interp, PyThreadState *tstate)
     _Py_ClearExecutorDeletionList(interp);
 #endif
     _PyAST_Fini(interp);
-    _PyWarnings_Fini(interp);
     _PyAtExit_Fini(interp);
 
     // All Python types must be destroyed before the last GC collection. Python
@@ -925,6 +924,9 @@ interpreter_clear(PyInterpreterState *interp, PyThreadState *tstate)
     _PyGC_CollectNoFail(tstate);
     _PyGC_Fini(interp);
 
+    // Finalize warnings after last gc so that any finalizers can
+    // access warnings state
+    _PyWarnings_Fini(interp);
     /* We don't clear sysdict and builtins until the end of this function.
        Because clearing other attributes can execute arbitrary Python code
        which requires sysdict and builtins. */