[macOS] Codex spawns ~100 zombie child processes per 5 seconds at startup, exhausting process limit (kern.maxprocperuid=2666) #28244

Environment

• Codex version: 26.609.41114
• macOS: 14.5 (Sonoma)
• Hardware: Apple Silicon
• Reproduction: Immediate on app launch, no user interaction required

Description

Immediately after opening Codex, the main process (Codex.app/Contents/MacOS/Codex)
spawns < />100 <defunct> zombie child processes every 5 seconds (< />20/sec).
These are never reaped, accumulating until macOS's per-user process limit
(kern.maxprocperuid = 2666) is exhausted.

When the limit is hit:

• System load spikes to 500–900
• macOS cannot fork any new processes (all apps affected)
• Codex itself disconnects and attempts to reconnect in a loop
• Other apps (Xcode, Chrome, terminal) become unresponsive

Reproduction Steps

1. Ensure system is clean (0 zombie processes)
2. Open Codex.app
3. Do nothing — observe with watch -n1 "ps aux | awk '\$8==\"Z\"' | wc -l"

Result: zombie count grows at ~100/5s, hits ~2600 within ~2 minutes

Diagnostic Data

Zombie parent is always the main Codex PID:

ps -eo pid,ppid,stat,comm | awk '$3< />/Z/{print $2}' | sort | uniq -c
→ 1329

Rate measured over 40s:

10:33:06 zombies=39
10:33:12 zombies=146 (+107)
10:33:18 zombies=242 (+96)
10:33:24 zombies=333 (+91)
10:33:42 zombies=596 (+90/5s)

What Was Ruled Out

All of the following have no effect on the zombie accumulation rate:

• [features] goals = false
• [plugins."computer-use@openai-bundled"] enabled = false
• [plugins."browser@openai-bundled"] enabled = false
• Removing notify callback from config
• Disabling/deleting SkyComputerUseService and SkyComputerUseClient
• Removing node_repl MCP server
• Removing trusted project entries
• Fresh reinstall (same version)

Related Issues

• SkyComputerUseClient processes spawned for turn-ended events remain alive as PPID=1 orphans #26293 (SkyComputerUseClient orphans — different pattern, slow accumulation over days)
• macOS Codex relaunch loop exhausts syspolicyd file descriptors and blocks app launches #25243 (relaunch loop exhausting syspolicyd — similar symptom, older version)