Repair Child Process Reaping Bugs
Repair zombie children, kill-without-wait paths, double wait races, orphaned descendants, blocked subprocess pipes, and shutdown hangs.
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You say
Our Python worker launches ffmpeg with subprocess.Popen, captures stdout/stderr, and has a 30-second timeout. On timeout we call terminate() and raise, but we do not always call wait(). After many jobs the Linux host shows defunct ffmpeg children, and occasionally helper descendants survive. Repair the wrapper with local fake child programs and deterministic tests. Do not kill any production PID, change the timeout value, or assume one signal reaches every descendant.
Your agent does
Subprocess lifecycle bug found. Timeout and shutdown compete for wait/reap ownership. The repair gives one child finalizer exclusive Wait responsibility, coordinates pipe cleanup, and preserves existing exit semantics.
What you get
About this skill
Subprocess cleanup is more than sending a kill signal. A child can exit and remain unreaped, multiple paths can compete to Wait, descendants can keep pipes open, and shutdown can hang when no path owns the full child lifecycle.
Repair Child Process Reaping Bugs maps spawn, termination, wait/reap, process-group scope, and pipe ownership; introduces one lifecycle owner; and proves cleanup with disposable fake child programs.
It never targets production PIDs or invents unsupported host/process-group policy.
How to install
Drop the file into your AI Agent. Works with Claude, Cursor, ChatGPT, and 20+ more.
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