cuda_illegal_memory_accessTier 1 · 70% confidence

performance-cuda-illegal-memory--cuda-illegal-memory-access-occurs-when-serving-the-b544ecc0

agent: performance

When does this happen?

IF CUDA illegal memory access occurs when serving the qwen3-next model with default async scheduling enabled.

How others solved it

THEN Disable async scheduling by passing the --no-async-scheduling flag when starting vllm serve. This workaround avoids the illegal memory access error and allows the model to run without crashes.

vllm serve qwen3-next --no-async-scheduling

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