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vllm - 💡(How to fix) Fix [CI Failure]: Multiple tests failing with assert output_size is not None

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Root Cause

  • Flaky test
  • Can reproduce locally
  • Caused by external libraries (e.g. bug in transformers)
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Name of failing test

tests/compile/fullgraph/test_full_graph.py::test_fp8_kv_scale_compile (e.g.)

Basic information

  • Flaky test
  • Can reproduce locally
  • Caused by external libraries (e.g. bug in transformers)

🧪 Describe the failing test

Multiple tests fail with assert output_size is not None, also after retry.

Failing tests include:

  • tests/compile/fullgraph/test_full_graph.py::test_fp8_kv_scale_compile (multiple models)
  • v1/spec_decode/test_speculators_correctness.py::test_speculators_model
  • quantization/test_fp8.py::test_online_quantization
  • Run in Distributed Torchrun + Examples (4 GPUs)

📝 History of failing test

This is a new failure

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