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gh-157335: Fix out-of-bounds write in mmap.mmap.__setitem__ #209320

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gh-157335: Fix out-of-bounds write in mmap.mmap.__setitem__

gh-157335: Fix out-of-bounds write in mmap.mmap.__setitem__ #209320

Triggered via pull request September 13, 2026 15:19
@JoekrryJoekrry
synchronize #157438
Joekrry:fix-mmap-setitem-resize-reentrancy
Status Failure
Total duration 32m 22s
Artifacts 1

build.yml

on: pull_request
Change detection  /  Create context from changed files
11s
Change detection / Create context from changed files
Matrix: Address sanitizer
Matrix: build-macos
Matrix: build-san
Matrix: Ubuntu SSL tests
Matrix: build-ubuntu
Matrix: build-windows
Matrix: cifuzz
Docs  /  Doctest
7m 26s
Docs / Doctest
Docs  /  Check EPUB
2m 26s
Docs / Check EPUB
Check if Autoconf files are up to date
23s
Check if Autoconf files are up to date
Check if generated files are up to date
4m 18s
Check if generated files are up to date
C API Docs  /  Check if all C APIs are documented
10s
C API Docs / Check if all C APIs are documented
Ubuntu (installed)  /  build, install and test
6m 28s
Ubuntu (installed) / build, install and test
iOS
23m 19s
iOS
Emscripten  /  build and test
18m 34s
Emscripten / build and test
WASI  /  build and test
5m 7s
WASI / build and test
Hypothesis tests on Ubuntu
9m 26s
Hypothesis tests on Ubuntu
Cross build Linux
4m 25s
Cross build Linux
Docs  /  Docs
2m 2s
Docs / Docs
Matrix: build-android
Docs  /  ...  /  Check for removed HTML IDs
Docs / Check for removed HTML IDs / Check for removed HTML IDs
All required checks pass
5s
All required checks pass
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Annotations

8 errors, 7 warnings, and 2 notices
Docs / Docs
Process completed with exit code 255.
Docs / Docs
Process completed with exit code 2.
Docs / Check EPUB
Process completed with exit code 1.
macOS / build and test (macos-26)
Process completed with exit code 2.
macOS (free-threading) / build and test (macos-26)
Process completed with exit code 2.
macOS / build and test (macos-26-intel)
Process completed with exit code 2.
iOS
Process completed with exit code 1.
All required checks pass
Process completed with exit code 1.
Cross build Linux: Parser/lexer/string.c#L81
variable ‘previous_end’ set but not used [-Wunused-but-set-variable]
Ubuntu (installed) / build, install and test: Parser/lexer/string.c#L81
variable ‘previous_end’ set but not used [-Wunused-but-set-variable]
Hypothesis tests on Ubuntu
No files were found with the provided path: /home/runner/work/cpython/cpython-builddir/.hypothesis/examples/. No artifacts will be uploaded.
macOS / build and test (macos-26)
`$HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK` is set: not checking for outdated dependents or dependents with broken linkage!
macOS (free-threading) / build and test (macos-26)
`$HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK` is set: not checking for outdated dependents or dependents with broken linkage!
macOS / build and test (macos-26-intel)
`$HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK` is set: not checking for outdated dependents or dependents with broken linkage!
Address sanitizer (ubuntu-26.04): Parser/lexer/string.c#L81
variable ‘previous_end’ set but not used [-Wunused-but-set-variable]
Windows / Build and test (arm64, switch-case)
"The windows-11-arm label will migrate to use Visual Studio 2026 by default beginning September 21, 2026. For more information see https://github.com/actions/runner-images/issues/14602"
Windows (free-threading) / Build and test (arm64, switch-case)
"The windows-11-arm label will migrate to use Visual Studio 2026 by default beginning September 21, 2026. For more information see https://github.com/actions/runner-images/issues/14602"

Artifacts

Produced during runtime
Name Size Digest
UBSan-logs-default
1.6 KB
sha256:bc6e86c2fbfb38ee127a33e5cf8ea780aa4b45bdeb67720073f7e4861c8ccab3