The hosted runner lost communication with the server. Anything in your workflow that terminates the runner process, starves it for CPU/Memory, or blocks its network access can cause this error.

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): Modules/unicodedata.c#L1569

'function': conversion from 'size_t' to 'int', possible loss of data [D:\a\cpython\cpython\PCbuild\unicodedata.vcxproj]

Windows / Build and test (x64): Python/generated_cases.c.h#L12359

'initializing': conversion from '__int64' to 'int', possible loss of data [D:\a\cpython\cpython\PCbuild\pythoncore.vcxproj]

Windows / Build and test (x64): Python/generated_cases.c.h#L7662

'initializing': conversion from '__int64' 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`$HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK` is set: not checking for outdated dependents or dependents with broken linkage!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 (free-threading) / build and test (macos-26)

`$HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK` is set: not checking for outdated dependents or dependents with broken linkage!

Windows / Build and test (arm64): Modules/unicodedata.c#L1569

'function': conversion from 'size_t' to 'int', possible loss of data [C:\a\cpython\cpython\PCbuild\unicodedata.vcxproj]

Windows / Build and test (arm64): Python/generated_cases.c.h#L12359

'initializing': conversion from '__int64' to 'int', possible loss of data [C:\a\cpython\cpython\PCbuild\pythoncore.vcxproj]

Windows / Build and test (arm64): Python/generated_cases.c.h#L7662

'initializing': conversion from '__int64' to 'int', possible loss of data [C:\a\cpython\cpython\PCbuild\pythoncore.vcxproj]

Windows (free-threading) / Build and test (arm64): Modules/unicodedata.c#L1569

'function': conversion from 'size_t' to 'int', possible loss of data [C:\a\cpython\cpython\PCbuild\unicodedata.vcxproj]

Windows (free-threading) / Build and test (arm64): Python/generated_cases.c.h#L12359

'initializing': conversion from '__int64' to 'int', possible loss of data [C:\a\cpython\cpython\PCbuild\pythoncore.vcxproj]

Windows (free-threading) / Build and test (arm64): Python/generated_cases.c.h#L7662

'initializing': conversion from '__int64' to 'int', possible loss of data [C:\a\cpython\cpython\PCbuild\pythoncore.vcxproj]

Windows (free-threading) / Build and test (x64): Modules/unicodedata.c#L1569

'function': conversion from 'size_t' to 'int', possible loss of data [D:\a\cpython\cpython\PCbuild\unicodedata.vcxproj]

Windows (free-threading) / Build and test (x64): Python/generated_cases.c.h#L12359

'initializing': conversion from '__int64' to 'int', possible loss of data [D:\a\cpython\cpython\PCbuild\pythoncore.vcxproj]

Windows (free-threading) / Build and test (x64): Python/generated_cases.c.h#L7662

'initializing': conversion from '__int64' to 'int', possible loss of data [D:\a\cpython\cpython\PCbuild\pythoncore.vcxproj]

Change detection / Create context from changed files

"The ubuntu-latest label will migrate to Ubuntu 26 beginning October 19, 2026. For more information, see https://github.com/actions/runner-images/issues/14748"

C API Docs / Check if all C APIs are documented

"The ubuntu-latest label will migrate to Ubuntu 26 beginning October 19, 2026. For more information, see https://github.com/actions/runner-images/issues/14748"

Docs / Check EPUB

"The ubuntu-latest label will migrate to Ubuntu 26 beginning October 19, 2026. For more information, see https://github.com/actions/runner-images/issues/14748"

Docs / Docs

"The ubuntu-latest label will migrate to Ubuntu 26 beginning October 19, 2026. For more information, see https://github.com/actions/runner-images/issues/14748"

CIFuzz / cpython3 (memory)

"The ubuntu-latest label will migrate to Ubuntu 26 beginning October 19, 2026. For more information, see https://github.com/actions/runner-images/issues/14748"

CIFuzz / cpython3 (undefined)

"The ubuntu-latest label will migrate to Ubuntu 26 beginning October 19, 2026. For more information, see https://github.com/actions/runner-images/issues/14748"

Windows / Build and test (arm64)

"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"

CIFuzz / python3-libraries (address)

"The ubuntu-latest label will migrate to Ubuntu 26 beginning October 19, 2026. For more information, see https://github.com/actions/runner-images/issues/14748"

Windows (free-threading) / Build and test (arm64)

"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 MSI / installer for arm64

"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"

All required checks pass

"The ubuntu-latest label will migrate to Ubuntu 26 beginning October 19, 2026. For more information, see https://github.com/actions/runner-images/issues/14748"

Artifacts

Produced during runtime

Name	Size	Digest
UBSan-logs-default	1.55 KB	`sha256:6a4467489ddf7d17d977c8d53af781a32690fef37bb5d5d558075bdb39d8ed99`
memory-artifacts	1.91 KB	`sha256:77f9bde68cfb65754e24cd495a3f7659616f2e83b29869f20c5037052b583562`
undefined-artifacts	1.88 KB	`sha256:0a62ea760b4b4276e3d24081e60b3f14c94ad3ae4903a977578e21f22c53c45b`

Navigation Menu

Uh oh!

[3.14] build(deps): bump the actions group with 12 updates (GH-158342) #211423

Summary