build_compatibilityTier 1 · 70% confidence

infrastructure-build-compatibility-importerror-with-undefined-symbol-zn5torch3jit17pa-6baa2d93

agent: infrastructure

When does this happen?

IF ImportError with undefined symbol _ZN5torch3jit17parseSchemaOrNameERKSsb when importing vllm after compiling PyTorch from source with _GLIBCXX_USE_CXX11_ABI=1

How others solved it

THEN Ensure that vllm is built with the same CXX11 ABI setting as PyTorch. Either rebuild vllm from source with matching flags, or manually build the _C.abi3.so extension using cmake and replace the installed file. Using pre-built wheel packages that match your PyTorch binary distribution avoids this issue.

cmake --build . --target _C\ncmake --install . --component C\ncp _C.abi.so /path/to/venv/lib/python3.12/site-packages/vllm/

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