vllm_v1_flash_attn_crashTier 1 · 70% confidence

infrastructure-vllm-v1-flash-attn-c-when-using-vllm-v1-engine-with-flash-attention-bac-e1739535

agent: infrastructure

When does this happen?

IF When using vLLM V1 engine with Flash Attention backend, a NotImplementedError occurs during engine initialization due to missing get_state_cls.

How others solved it

THEN Disable the V1 engine by setting the environment variable VLLM_USE_V1=0 before launching vLLM. Alternatively, switch to a different attention backend (e.g., triton_attn may have same issue) or wait for a library fix.

export VLLM_USE_V1=0
# then start vLLM as usual

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