[Bug] DFlash2 spec decode + xgrammar: deterministic “Failed to advance FSM” on json_object grammar (same draft token every time)
![[Bug] DFlash2 spec decode + xgrammar: deterministic "Failed to advance FSM" on json_object grammar (same draft token every time)](https://www.chat-gpts.plus/wp-content/uploads/2026/09/53777-75f62c55-768x403.jpg)
该报错通常出现在 vLLM 同时启用 DFlash2 推测解码(spec decode)与 xgrammar 结构化输出( response_format: {"type": "json_object"} )时,xgrammar 后端在推进 FSM 时收到一个违反语法的草稿 token(本 Issu


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