[deepseek-v4-flash-sm86 fork] PP8 + DSpark: recurring deadlock in the V2-runner PP sampled-token/draft broadcast protocol (PPHandler)
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该报错发生在 vLLM V2 Runner 启用流水线并行(PP=8)配合 DSpark 投机解码(DeepSeek-V4-Flash 模型)时,表现为长时间运行后 PP 末级 rank 死锁、采样 token 广播协议错位。优先排查 PP 广播的 NCCL 集体通信调度是否因数据依赖产生跨步错位,
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