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known-issues.md

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Incompatibility of TensorFlow-GPU over fork-based crash safty

fuzz.crash_safe=true allows running compilation & execution in a forked process as a sandbox to catch crash and timeout. However, CUDA runtime is not compatible with fork. In tensorflow, the symptom is crash in forked subprocess:

F tensorflow/stream_executor/cuda/cuda_driver.cc:219] Failed setting context: CUDA_ERROR_NOT_INITIALIZED: initialization error
  • For tflite it's okay as it does not require GPU and nnsmith.fuzz will directly set CUDA_VISIBLE_DEVICES=-1 in the beginning;
  • For xla it's a bit headache, currently we need to manually specify fuzz.crash_safe=false for fuzzing and allow it to crash;
  • We are tracking this issue in TensorFlow. We are likely to fix this by executing a TensorFlow model in a seperated process if it cannot be resolved in the near future.