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src/app/livekit/compat.py

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+from __future__ import annotations
+
+from importlib import import_module
+
+
+def patch_inference_executor_is_alive() -> bool:
+    """
+    Guard LiveKit's health check against a closed multiprocessing.Process.
+
+    livekit-agents==1.3.10 calls InferenceProcExecutor.is_alive() from the
+    aiohttp health route. After shutdown, multiprocessing raises
+    ValueError("process object is closed"), which turns a normal unhealthy
+    state into a 500.
+    """
+
+    try:
+        module = import_module("livekit.agents.ipc.inference_proc_executor")
+    except ImportError:
+        return False
+
+    executor_cls = getattr(module, "InferenceProcExecutor", None)
+    if executor_cls is None:
+        return False
+
+    current_is_alive = getattr(executor_cls, "is_alive", None)
+    if current_is_alive is None:
+        return False
+
+    if getattr(current_is_alive, "__tim_closed_process_guard__", False):
+        return False
+
+    def _safe_is_alive(self) -> bool:
+        try:
+            return current_is_alive(self)
+        except ValueError as exc:
+            if str(exc) != "process object is closed":
+                raise
+            return False
+
+    _safe_is_alive.__tim_closed_process_guard__ = True
+    executor_cls.is_alive = _safe_is_alive
+    return True