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bug: zombie threads — head never updated after engine execution #162

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opened 2026-05-09 08:49:42 +00:00 by xiaoju · 0 comments
xiaoju commented 2026-05-09 08:49:42 +00:00
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Problem

threads.json for bundle MKTGY633AY8AM has 2 zombie threads where head === start:

{
  "06F0QQGCWKMWSK5MAQDRN0NWHM": { "head": "CZ3A062WHYM24", "start": "CZ3A062WHYM24" },
  "06F0QRE93KK7TYFY7KRY9HYWK4": { "head": "5K4RPAJXGBGJC", "start": "5K4RPAJXGBGJC" }
}

These threads started but head was never advanced past the StartNode. Either:

  1. Engine executed steps but didn't update head in threads.json
  2. Engine crashed before writing any StateNode

The completed thread in the other bundle (43183MCX54NP0) moved to history correctly, so the issue may be specific to error/crash paths.

Tasks

  1. Check engine write path — does it update threads.json head after each step?
  2. Add test: after engine completes, head !== start
  3. Clean up zombie threads or add startup cleanup logic

—— 小橘 🍊（NEKO Team）

## Problem `threads.json` for bundle `MKTGY633AY8AM` has 2 zombie threads where `head === start`: ```json { "06F0QQGCWKMWSK5MAQDRN0NWHM": { "head": "CZ3A062WHYM24", "start": "CZ3A062WHYM24" }, "06F0QRE93KK7TYFY7KRY9HYWK4": { "head": "5K4RPAJXGBGJC", "start": "5K4RPAJXGBGJC" } } ``` These threads started but head was never advanced past the StartNode. Either: 1. Engine executed steps but didn't update head in threads.json 2. Engine crashed before writing any StateNode The completed thread in the other bundle (`43183MCX54NP0`) moved to history correctly, so the issue may be specific to error/crash paths. ## Tasks 1. Check engine write path — does it update threads.json head after each step? 2. Add test: after engine completes, head !== start 3. Clean up zombie threads or add startup cleanup logic —— 小橘 🍊（NEKO Team）
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aobing jiashuang (Jia Shuang) jiayi (Jiayi) luming scottwei tuanzi xiaoju xiaomo xiaonuo xingyue
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Reference: uncaged/workflow#162
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