From e423ceef9c7092d63ad797d5f6cfa8784bc98377 Mon Sep 17 00:00:00 2001
From: Eric Yang <eyang@apache.org>
Date: Sun, 22 Mar 2026 16:24:37 +0000
Subject: [PATCH] fix(shell): reap zombie processes when command timeout kills
 subprocess

---
 nanobot/agent/tools/shell.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/nanobot/agent/tools/shell.py b/nanobot/agent/tools/shell.py
index 4b10c83..9996684 100644
--- a/nanobot/agent/tools/shell.py
+++ b/nanobot/agent/tools/shell.py
@@ -109,6 +109,11 @@ class ExecTool(Tool):
                 try:
                     await asyncio.wait_for(process.wait(), timeout=5.0)
                 except asyncio.TimeoutError:
+                    try:
+                        os.waitpid(process.pid, os.WNOHANG)
+                    except (ProcessLookupError, ChildProcessError):
+                        pass
+                except ProcessLookupError:
                     pass
                 return f"Error: Command timed out after {effective_timeout} seconds"