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gh-156939: Detect buffer overflow in PyBytesWriter in debug mode #208836

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gh-156939: Detect buffer overflow in PyBytesWriter in debug mode

gh-156939: Detect buffer overflow in PyBytesWriter in debug mode #208836

Triggered via pull request September 9, 2026 19:38
@vstinnervstinner
synchronize #156943
vstinner:writer_canary
Status Cancelled
Total duration 10m 47s
Artifacts 2

build.yml

on: pull_request
Change detection  /  Create context from changed files
10s
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 21s
Docs / Doctest
Docs  /  Check EPUB
2m 30s
Docs / Check EPUB
Check if Autoconf files are up to date
24s
Check if Autoconf files are up to date
Check if generated files are up to date
4m 43s
Check if generated files are up to date
C API Docs  /  Check if all C APIs are documented
12s
C API Docs / Check if all C APIs are documented
Ubuntu (installed)  /  build, install and test
6m 2s
Ubuntu (installed) / build, install and test
iOS
10m 10s
iOS
Emscripten  /  build and test
10m 15s
Emscripten / build and test
WASI  /  build and test
5m 14s
WASI / build and test
Hypothesis tests on Ubuntu
10m 17s
Hypothesis tests on Ubuntu
Cross build Linux
3m 58s
Cross build Linux
Docs  /  Docs
2m 11s
Docs / Docs
Matrix: build-android
Docs  /  ...  /  Check for removed HTML IDs
2m 39s
Docs / Check for removed HTML IDs / Check for removed HTML IDs
All required checks pass
6s
All required checks pass
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80 errors, 7 warnings, and 2 notices
Docs / Docs
Process completed with exit code 2.
Docs / Check EPUB
Process completed with exit code 1.
Ubuntu (installed) / build, install and test
Process completed with exit code 2.
macOS (free-threading) / build and test (macos-26)
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
macOS (free-threading) / build and test (macos-26)
The operation was canceled.
macOS / build and test (macos-26)
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
macOS / build and test (macos-26)
The operation was canceled.
macOS / build and test (macos-26-intel)
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
macOS / build and test (macos-26-intel)
The operation was canceled.
Ubuntu (free-threading) / build and test (ubuntu-26.04-arm)
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
CIFuzz / cpython3 (address)
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
CIFuzz / cpython3 (address)
Path does not exist: cifuzz-sarif/results.sarif
CIFuzz / cpython3 (address)
The operation was canceled.
Ubuntu / build and test (ubuntu-26.04)
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Ubuntu / build and test (ubuntu-26.04)
The operation was canceled.
CIFuzz / cpython3 (memory)
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
CIFuzz / cpython3 (memory)
Path does not exist: cifuzz-sarif/results.sarif
CIFuzz / cpython3 (memory)
The operation was canceled.
Windows / Build and test (Win32, switch-case)
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Windows / Build and test (Win32, switch-case)
The operation was canceled.
Windows / Build and test (x64, tail-call)
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Windows / Build and test (x64, tail-call)
The operation was canceled.
Windows (free-threading) / Build and test (x64, tail-call)
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Windows (free-threading) / Build and test (x64, tail-call)
The operation was canceled.
Windows (free-threading) / Build and test (x64, switch-case)
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Windows (free-threading) / Build and test (x64, switch-case)
The operation was canceled.
Emscripten / build and test
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Emscripten / build and test
The operation was canceled.
Windows / Build and test (x64, switch-case)
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Windows / Build and test (x64, switch-case)
The operation was canceled.
iOS
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
iOS
The operation was canceled.
Windows / Build and test (arm64, switch-case)
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Windows / Build and test (arm64, switch-case)
The operation was canceled.
CIFuzz / cpython3 (undefined)
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
CIFuzz / cpython3 (undefined)
The operation was canceled.
Ubuntu (bolt) / build and test (ubuntu-26.04)
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Ubuntu (bolt) / build and test (ubuntu-26.04)
The operation was canceled.
Address sanitizer (ubuntu-26.04)
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Address sanitizer (ubuntu-26.04)
The operation was canceled.
Android (x86_64)
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Android (x86_64)
The operation was canceled.
Windows (free-threading) / Build and test (arm64, switch-case)
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Windows (free-threading) / Build and test (arm64, switch-case)
The operation was canceled.
Sanitizers / TSan
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Sanitizers / TSan
The operation was canceled.
Hypothesis tests on Ubuntu
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Hypothesis tests on Ubuntu
The operation was canceled.
Ubuntu (free-threading) / build and test (ubuntu-26.04)
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Ubuntu (free-threading) / build and test (ubuntu-26.04)
The operation was canceled.
Ubuntu / build and test (ubuntu-26.04-arm)
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Ubuntu / build and test (ubuntu-26.04-arm)
The operation was canceled.
Sanitizers / TSan (free-threading)
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Sanitizers / TSan (free-threading)
The operation was canceled.
Sanitizers / UBSan
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Sanitizers / UBSan
The operation was canceled.
Tests
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Tests
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
All required checks pass
Process completed with exit code 1.
Tests
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Tests
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Tests
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Tests
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Tests
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Tests
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Tests
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Tests
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Tests
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Tests
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Tests
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Tests
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Tests
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Tests
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Tests
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Tests
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Tests
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Tests
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Tests
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Tests
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
Tests
Canceling since a higher priority waiting request for Tests-vstinner-writer_canary exists
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]
macOS (free-threading) / build and test (macos-26)
`$HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK` is set: not checking for outdated dependents or dependents with broken linkage!
macOS / build and test (macos-26)
`$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]
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.
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
363 Bytes
sha256:08d0dad2788c9de826a87669e536c9f3d955d95035efb00ca5511ba56bed5303
html-ids-head.json.gz
126 KB
sha256:ad06ecd0d3bc242b06771c173fd57de5eaece71202762d1caaa63f76ee3f005a