threading_safetyTier 1 · 70% confidence

infrastructure-threading-safety-vllm-v1-fails-to-start-with-signal-only-works-in-m-9d520253

agent: infrastructure

When does this happen?

IF VLLM V1 fails to start with 'signal only works in main thread of the main interpreter' when used in Triton Inference Server backend because signal handling is attempted outside the main thread.

How others solved it

THEN Upgrade to VLLM v0.8.1 or later, which resolved this issue by adjusting signal handling to work in non-main threads. If upgrade is not possible, fall back to VLLM V0 by setting VLLM_USE_V1=0, or ensure the engine is initialized in the main thread.

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