Fixed codex synthesis processes hanging on stdin wait
Source type:
obs· Harvested: 2026-05-04 · Original date: 2026-05-03T17:23:05.298Z Metadata:{"project":"lunhsiangyuan","type":"bugfix","obs_id":65208}
obs/65208 · bugfix · 2026-05-03T17:23:05.298Z
Fixed codex synthesis processes hanging on stdin wait
知識庫 v4 重建的 4 個並行 codex synthesis 進程全部卡在等待 stdin 輸入。檢查發現有 10 個 codex 進程（正常應該 4 個），表示之前的嘗試也失敗了但沒清理。根本原因：codex exec 在背景執行時預設會嘗試從 stdin 讀取，但背景 job 沒有 stdin 可讀導致 hang。修復方法：pkill 清理所有卡住的進程，重新啟動時明確加上 < /dev/null 重定向，確保 codex 不會等待輸入。這是常見的背景 job 陷阱 - 忘記處理 stdin/stdout/stderr 重定向。
Concepts: [“problem-solution”,“gotcha”,“what-changed”]
Facts: [“Codex gpt-5.5 synthesis processes for all 4 topics hung indefinitely on “Reading additional input from stdin…” state”,“10 codex exec processes running instead of expected 4, indicating process accumulation from previous failed attempts”,“Killed all stuck “codex exec” processes with pkill before restart”,“Restarted 4 parallel codex jobs with explicit < /dev/null stdin redirection in background task bm2gbjvbn”,“Background synthesis jobs output to /tmp/codex-v4-{topic}.log with 420-second timeout”]
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