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gh-148286: Fix UB in ZstdDecompressor.unused_data when a frame is decompressed in one call #200364

gh-148286: Fix UB in ZstdDecompressor.unused_data when a frame is decompressed in one call

gh-148286: Fix UB in ZstdDecompressor.unused_data when a frame is decompressed in one call #200364

Triggered via pull request July 7, 2026 11:39
Status Failure
Total duration 30m 11s
Artifacts 3

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-msi
Waiting for pending jobs
Matrix: build-windows
Matrix: cifuzz
Docs  /  Doctest
7m 10s
Docs / Doctest
Docs  /  Check EPUB
2m 19s
Docs / Check EPUB
Check if Autoconf files are up to date
28s
Check if Autoconf files are up to date
Check if generated files are up to date
4m 42s
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
iOS
16m 51s
iOS
Emscripten  /  build and test
19m 18s
Emscripten / build and test
WASI  /  build and test
5m 26s
WASI / build and test
Hypothesis tests on Ubuntu
10m 37s
Hypothesis tests on Ubuntu
Cross build Linux
4m 45s
Cross build Linux
Matrix: build-android
Docs  /  ...  /  Check for removed HTML IDs
2m 15s
Docs / Check for removed HTML IDs / Check for removed HTML IDs
All required checks pass
5s
All required checks pass
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4 errors and 13 warnings
Docs / Docs
Process completed with exit code 2.
Docs / Check EPUB
Process completed with exit code 1.
Sanitizers / TSan (free-threading)
Process completed with exit code 2.
All required checks pass
Process completed with exit code 1.
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 (x64, tail-call): Modules/_interpchannelsmodule.c#L2938
'function': conversion from 'int64_t' to 'int', possible loss of data [D:\a\cpython\cpython\PCbuild\pythoncore.vcxproj]
macOS / build and test (macos-26)
`$HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK` is set: not checking for outdated dependents or dependents with broken linkage!
macOS / build and test (macos-26)
The following taps are not trusted: aws/tap Homebrew is currently ignoring formulae, casks and commands from these taps because tap trust is required. Untap them with: brew untap aws/tap Trust specific formulae, casks and commands with: brew trust --formula <user>/<tap>/<formula> brew trust --cask <user>/<tap>/<cask> brew trust --command <user>/<tap>/<command> Whole-tap trust is broader and includes all current and future formulae, casks and commands from the listed taps. Trust whole taps with: brew trust aws/tap To disable trust checks: export HOMEBREW_NO_REQUIRE_TAP_TRUST=1 This is not recommended and will be removed in a later release. For more information, see: https://docs.brew.sh/Tap-Trust
Windows (free-threading) / Build and test (x64, tail-call): Modules/_interpchannelsmodule.c#L2938
'function': conversion from 'int64_t' to 'int', possible loss of data [D:\a\cpython\cpython\PCbuild\pythoncore.vcxproj]
macOS (free-threading) / build and test (macos-26)
`$HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK` is set: not checking for outdated dependents or dependents with broken linkage!
macOS (free-threading) / build and test (macos-26)
The following taps are not trusted: aws/tap Homebrew is currently ignoring formulae, casks and commands from these taps because tap trust is required. Untap them with: brew untap aws/tap Trust specific formulae, casks and commands with: brew trust --formula <user>/<tap>/<formula> brew trust --cask <user>/<tap>/<cask> brew trust --command <user>/<tap>/<command> Whole-tap trust is broader and includes all current and future formulae, casks and commands from the listed taps. Trust whole taps with: brew trust aws/tap To disable trust checks: export HOMEBREW_NO_REQUIRE_TAP_TRUST=1 This is not recommended and will be removed in a later release. For more information, see: https://docs.brew.sh/Tap-Trust
Windows / Build and test (x64, switch-case): Modules/_interpchannelsmodule.c#L2938
'function': conversion from 'int64_t' to 'int', possible loss of data [D:\a\cpython\cpython\PCbuild\pythoncore.vcxproj]
Windows / Build and test (arm64, switch-case): Modules/_interpchannelsmodule.c#L2938
'function': conversion from 'int64_t' to 'int', possible loss of data [C:\a\cpython\cpython\PCbuild\pythoncore.vcxproj]
macOS / build and test (macos-26-intel)
`$HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK` is set: not checking for outdated dependents or dependents with broken linkage!
macOS / build and test (macos-26-intel)
The following taps are not trusted: aws/tap Homebrew is currently ignoring formulae, casks and commands from these taps because tap trust is required. Untap them with: brew untap aws/tap Trust specific formulae, casks and commands with: brew trust --formula <user>/<tap>/<formula> brew trust --cask <user>/<tap>/<cask> brew trust --command <user>/<tap>/<command> Whole-tap trust is broader and includes all current and future formulae, casks and commands from the listed taps. Trust whole taps with: brew trust aws/tap To disable trust checks: export HOMEBREW_NO_REQUIRE_TAP_TRUST=1 This is not recommended and will be removed in a later release. For more information, see: https://docs.brew.sh/Tap-Trust
Windows (free-threading) / Build and test (arm64, switch-case): Modules/_interpchannelsmodule.c#L2938
'function': conversion from 'int64_t' to 'int', possible loss of data [C:\a\cpython\cpython\PCbuild\pythoncore.vcxproj]
Windows (free-threading) / Build and test (x64, switch-case): Modules/_interpchannelsmodule.c#L2938
'function': conversion from 'int64_t' to 'int', possible loss of data [D:\a\cpython\cpython\PCbuild\pythoncore.vcxproj]

Artifacts

Produced during runtime
Name Size Digest
TSan-logs-free-threading
3.33 KB
sha256:f5df82dd2433b323e58c9993fcda11ad74383c4e179fe3371a40abab0ccd6bd6
UBSan-logs-default
1.59 KB
sha256:92b740e20b872daf3cc03966e57e0b8cb513647947af5f182a84e1ae0064ffbb
html-ids-head.json.gz
125 KB
sha256:938392bb55562f4c25e4af43c10f00723e12b8ac0abd23c5ca9f4dcfa56a3e15