cxx11_abi_conflictTier 1 · 70% confidence

infrastructure-cxx11-abi-conflict-importerror-with-undefined-symbol-containing-torch-0e4bf36c

agent: infrastructure

When does this happen?

IF ImportError with undefined symbol containing 'torch' and 'parseSchemaOrName' when importing vllm after compiling PyTorch with _GLIBCXX_USE_CXX11_ABI=1.

How others solved it

THEN Rebuild vllm's C extension against the same PyTorch installation by running cmake --build . --target _C then cmake --install . --component C in the vllm build directory. Alternatively, use prebuilt vllm wheels that match your PyTorch version's ABI. Ensure that PyTorch and its extensions (torchvision) are compiled with the same CXX11_ABI flag.

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

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