Thanks, Hans I modified my list to:
<node : nil <= 2371 => 2873 : par vmodepar> <node : 2371 <= 2873 => 3113 : glue indentskip> <node : 2873 <= 3113 => 3119 : glue parinitleftskip> <node : 3113 <= 3119 => 2879 : glue parinitrightskip> <node : 3119 <= 2879 => 2891 : glyph unset> ... <node : 636 <= 3077 => 639 : glyph unset> <node : 3077 <= 639 => 3089 : kern userkern> <node : 639 <= 3089 => 2334 : glue userskip> <node : 3089 <= 2334 => 3095 : rule normal> <node : 2334 <= 3095 => 3101 : glue spaceskip> <node : 3095 <= 3101 => 642 : glue spaceskip> <node : 3101 <= 642 => 3107 : penalty userpenalty> <node : 642 <= 3107 => 645 : glue userskip> <node : 3107 <= 645 => 3125 : penalty userpenalty> <node : 645 <= 3125 => 3131 : glue parfillleftskip> <node : 3125 <= 3131 => nil : glue parfillskip> but the error is the same, so I'll wait the tex.preparelinebreak(), and observe it's work for more details. Huang Fusyong(黄复雄)
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