gh-142884: Fix UAF in array.array.tofile with concurrent mutations

.gitattributes

@@ -83,8 +83,10 @@ Include/opcode.h                                    generated
 Include/opcode_ids.h                                generated
 Include/token.h                                     generated
 Lib/_opcode_metadata.py                             generated
-Lib/keyword.py                                      generated
 Lib/idlelib/help.html                               generated
+Lib/keyword.py                                      generated
+Lib/pydoc_data/topics.py                            generated
+Lib/pydoc_data/module_docs.py                       generated
 Lib/test/certdata/*.pem                             generated
 Lib/test/certdata/*.0                               generated
 Lib/test/levenshtein_examples.json                  generated

.github/workflows/tail-call.yml

@@ -79,26 +79,25 @@ jobs:
         with:
           python-version: '3.11'
 
-      - name: Native Windows (debug)
+      - name: Native Windows MSVC (release)
         if: runner.os == 'Windows' && matrix.architecture != 'ARM64'
-        shell: cmd
+        shell: pwsh
         run: |
-          choco install llvm --allow-downgrade --no-progress --version ${{ matrix.llvm }}.1.0
-          set PlatformToolset=clangcl
-          set LLVMToolsVersion=${{ matrix.llvm }}.1.0
-          set LLVMInstallDir=C:\Program Files\LLVM
-          call ./PCbuild/build.bat --tail-call-interp -d -p ${{ matrix.architecture }}
-          call ./PCbuild/rt.bat -d -p ${{ matrix.architecture }} -q --multiprocess 0 --timeout 4500 --verbose2 --verbose3
+          choco install visualstudio2026buildtools --no-progress -y --force --params "--add Microsoft.VisualStudio.Component.VC.Tools.x86.x64  --locale en-US --passive"
+          $env:PATH = "C:\Program Files (x86)\Microsoft Visual Studio\18\BuildTools\MSBuild\Current\bin;$env:PATH"
+          $env:PlatformToolset = "v145"
+          ./PCbuild/build.bat --tail-call-interp -c Release -p ${{ matrix.architecture }}
+          ./PCbuild/rt.bat -p ${{ matrix.architecture }} -q --multiprocess 0 --timeout 4500 --verbose2 --verbose3
 
       # No tests (yet):
-      - name: Emulated Windows (release)
+      - name: Emulated Windows Clang (release)
         if: runner.os == 'Windows' && matrix.architecture == 'ARM64'
-        shell: cmd
+        shell: pwsh
         run: |
           choco install llvm --allow-downgrade --no-progress --version ${{ matrix.llvm }}.1.0
-          set PlatformToolset=clangcl
-          set LLVMToolsVersion=${{ matrix.llvm }}.1.0
-          set LLVMInstallDir=C:\Program Files\LLVM
+          $env:PlatformToolset = "clangcl"
+          $env:LLVMToolsVersion = "${{ matrix.llvm }}.1.0"
+          $env:LLVMInstallDir = "C:\Program Files\LLVM"
           ./PCbuild/build.bat --tail-call-interp -p ${{ matrix.architecture }}
 
       - name: Native macOS (release)

.pre-commit-config.yaml

@@ -1,6 +1,6 @@
 repos:
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.13.2
+    rev: v0.14.10
     hooks:
       - id: ruff-check
         name: Run Ruff (lint) on Apple/
@@ -40,19 +40,19 @@ repos:
         files: ^Apple
       - id: ruff-format
         name: Run Ruff (format) on Doc/
-        args: [--check]
+        args: [--exit-non-zero-on-fix]
         files: ^Doc/
       - id: ruff-format
         name: Run Ruff (format) on Tools/build/check_warnings.py
-        args: [--check, --config=Tools/build/.ruff.toml]
+        args: [--exit-non-zero-on-fix, --config=Tools/build/.ruff.toml]
         files: ^Tools/build/check_warnings.py
       - id: ruff-format
         name: Run Ruff (format) on Tools/wasm/
-        args: [--check, --config=Tools/wasm/.ruff.toml]
+        args: [--exit-non-zero-on-fix, --config=Tools/wasm/.ruff.toml]
         files: ^Tools/wasm/
 
   - repo: https://github.com/psf/black-pre-commit-mirror
-    rev: 25.9.0
+    rev: 25.12.0
     hooks:
       - id: black
         name: Run Black on Tools/jit/
@@ -83,24 +83,24 @@ repos:
         files: '^\.github/CODEOWNERS|\.(gram)$'
 
   - repo: https://github.com/python-jsonschema/check-jsonschema
-    rev: 0.34.0
+    rev: 0.36.0
     hooks:
       - id: check-dependabot
       - id: check-github-workflows
       - id: check-readthedocs
 
   - repo: https://github.com/rhysd/actionlint
-    rev: v1.7.7
+    rev: v1.7.9
     hooks:
       - id: actionlint
 
   - repo: https://github.com/woodruffw/zizmor-pre-commit
-    rev: v1.14.1
+    rev: v1.19.0
     hooks:
       - id: zizmor
 
   - repo: https://github.com/sphinx-contrib/sphinx-lint
-    rev: v1.0.0
+    rev: v1.0.2
     hooks:
       - id: sphinx-lint
         args: [--enable=default-role]

Doc/Makefile

@@ -140,7 +140,8 @@ doctest:
 pydoc-topics: BUILDER = pydoc-topics
 pydoc-topics: build
 	@echo "Building finished; now run this:" \
-	      "cp build/pydoc-topics/topics.py ../Lib/pydoc_data/topics.py"
+	      "cp build/pydoc-topics/topics.py ../Lib/pydoc_data/topics.py" \
+	      "&& cp build/pydoc-topics/module_docs.py ../Lib/pydoc_data/module_docs.py"
 
 .PHONY: gettext
 gettext: BUILDER = gettext

Doc/c-api/intro.rst

@@ -107,6 +107,46 @@ header files properly declare the entry points to be ``extern "C"``. As a result
 there is no need to do anything special to use the API from C++.
 
 
+.. _capi-system-includes:
+
+System includes
+---------------
+
+   :file:`Python.h` includes several standard header files.
+   C extensions should include the standard headers that they use,
+   and should not rely on these implicit includes.
+   The implicit includes are:
+
+   * ``<assert.h>``
+   * ``<intrin.h>`` (on Windows)
+   * ``<inttypes.h>``
+   * ``<limits.h>``
+   * ``<math.h>``
+   * ``<stdarg.h>``
+   * ``<wchar.h>``
+   * ``<sys/types.h>`` (if present)
+
+   The following are included for backwards compatibility, unless using
+   :ref:`Limited API <limited-c-api>` 3.13 or newer:
+
+   * ``<ctype.h>``
+   * ``<unistd.h>`` (on POSIX)
+
+   The following are included for backwards compatibility, unless using
+   :ref:`Limited API <limited-c-api>` 3.11 or newer:
+
+   * ``<errno.h>``
+   * ``<stdio.h>``
+   * ``<stdlib.h>``
+   * ``<string.h>``
+
+.. note::
+
+   Since Python may define some pre-processor definitions which affect the standard
+   headers on some systems, you *must* include :file:`Python.h` before any standard
+   headers are included.
+
+
 Useful macros
 =============
 

Doc/c-api/module.rst

@@ -571,7 +571,7 @@ A module's token -- and the *your_token* value to use in the above code -- is:
   of that slot;
 - For modules created from an ``PyModExport_*``
   :ref:`export hook <extension-export-hook>`: the slots array that the export
-  hook returned (unless overriden with :c:macro:`Py_mod_token`).
+  hook returned (unless overridden with :c:macro:`Py_mod_token`).
 
 .. c:macro:: Py_mod_token
 

Doc/deprecations/pending-removal-in-3.15.rst

@@ -33,16 +33,6 @@ Pending removal in Python 3.15
 
   * ``load_module()`` method: use ``exec_module()`` instead.
 
-* :class:`locale`:
-
-  * The :func:`~locale.getdefaultlocale` function
-    has been deprecated since Python 3.11.
-    Its removal was originally planned for Python 3.13 (:gh:`90817`),
-    but has been postponed to Python 3.15.
-    Use :func:`~locale.getlocale`, :func:`~locale.setlocale`,
-    and :func:`~locale.getencoding` instead.
-    (Contributed by Hugo van Kemenade in :gh:`111187`.)
-
 * :mod:`pathlib`:
 
   * :meth:`!.PurePath.is_reserved`

Doc/deprecations/pending-removal-in-3.20.rst

@@ -1,9 +1,9 @@
 Pending removal in Python 3.20
 ------------------------------
 
-* The ``__version__`` attribute has been deprecated in these standard library
-  modules and will be removed in Python 3.20.
-  Use :py:data:`sys.version_info` instead.
+* The ``__version__``, ``version`` and ``VERSION`` attributes have been
+  deprecated in these standard library modules and will be removed in
+  Python 3.20. Use :py:data:`sys.version_info` instead.
 
   - :mod:`argparse`
   - :mod:`csv`
@@ -24,6 +24,9 @@ Pending removal in Python 3.20
   - :mod:`tkinter.font`
   - :mod:`tkinter.ttk`
   - :mod:`wsgiref.simple_server`
+  - :mod:`xml.etree.ElementTree`
+  - :mod:`!xml.sax.expatreader`
+  - :mod:`xml.sax.handler`
   - :mod:`zlib`
 
   (Contributed by Hugo van Kemenade and Stan Ulbrych in :gh:`76007`.)