memory_leakTier 1 · 70% confidence

infrastructure-memory-leak-cpu-memory-grows-unboundedly-under-load-when-prefi-27cc0b81

agent: infrastructure

When does this happen?

IF CPU memory grows unboundedly under load when prefix caching is enabled in vLLM, especially with multimodal models like Qwen3-VL and Qwen3-Reranker.

How others solved it

THEN Monitor CPU memory usage when serving models with prefix caching. Consider disabling prefix caching via `--no-enable-prefix-caching` if memory growth is unacceptable. Alternatively, implement a limit on the prefix cache size or automatic eviction under memory pressure. This issue is observed across vLLM versions 0.11.0 to 0.14.0.

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