[BUG] Bash tool hangs ~3 minutes on `docker compose up/down` on Linux

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report
• [x] I am using the latest version of Claude Code

What's Wrong?

docker compose up -d and docker compose down commands take ~3 minutes to return in the Bash tool, even though the actual command completes in ~10 seconds (verified with time). Other commands (echo, git, ls, docker compose ps) return instantly.

Reproduction

1. Have any docker-compose.yml with services
2. Run docker compose up -d via Bash tool — hangs ~3 min
3. Run docker compose down via Bash tool — hangs ~3 min
4. Run echo hello — instant

Workarounds attempted (all failed)

• < /dev/null
• --ansi=never --progress=plain
• setsid docker compose up -d &>/tmp/dc.log; cat /tmp/dc.log
• docker compose up -d 3>&- 2>&1 (closing fd3 explicitly)
• > /dev/null 2>&1

Suspected root cause

On Linux, docker compose spawns host-level processes (containerd-shim etc.) that inherit the Bash tool session's file descriptors. These processes outlive docker compose itself, keeping the pipe/socket open. Claude Code waits for EOF on the output fd, which never comes until timeout.

Mac is unaffected because Docker Desktop runs containers in a VM — no fd inheritance on the host.

Environment

• Claude Code: v2.1.81
• Platform: Linux (x86_64, kernel 6.19)
• Docker Compose: v5.0.2
• Shell: zsh