diff --git a/adapter/http/fastapi/app.py b/adapter/http/fastapi/app.py
index d0e60aa..ffa4851 100644
--- a/adapter/http/fastapi/app.py
+++ b/adapter/http/fastapi/app.py
@@ -75,13 +75,25 @@ def _build_shutdown_handler(
     container: AppContainer,
 ) -> Callable[[], Awaitable[None]]:
     async def shutdown() -> None:
+        errors: list[Exception] = []
+
         try:
             await _stop_cleanup_loop(app)
-        finally:
-            try:
-                _uninstrument_app(app)
-            finally:
-                container.shutdown()
+        except Exception as exc:
+            errors.append(exc)
+
+        try:
+            _uninstrument_app(app)
+        except Exception as exc:
+            errors.append(exc)
+
+        try:
+            container.shutdown()
+        except Exception as exc:
+            errors.append(exc)
+
+        if errors:
+            raise ExceptionGroup('app shutdown failed', errors)
 
     return shutdown
 
@@ -94,7 +106,9 @@ async def _run_cleanup_loop(
 
     while not stop_event.is_set():
         try:
-            container.usecases.cleanup_expired_sandboxes.execute()
+            await asyncio.to_thread(
+                container.usecases.cleanup_expired_sandboxes.execute
+            )
         except Exception as exc:
             container.observability.logger.error(
                 'sandbox_cleanup_failed',
diff --git a/tasks.md b/tasks.md
index 75b4ce8..b2de0dd 100644
--- a/tasks.md
+++ b/tasks.md
@@ -131,7 +131,7 @@
 ### M10. Устойчивый cleanup и вынос blocking cleanup из event loop
 
 - Субагент: `feature-developer`
-- Статус: pending
+- Статус: completed
 - Зависимости: `M09`
 - Commit required: no
 - Scope: сделать cleanup устойчивым к частичным ошибкам и не блокировать FastAPI event loop синхронным Docker stop
diff --git a/usecase/sandbox.py b/usecase/sandbox.py
index 0cb39e8..00946a8 100644
--- a/usecase/sandbox.py
+++ b/usecase/sandbox.py
@@ -102,34 +102,52 @@ class CleanupExpiredSandboxes:
         cleaned_sessions: list[SandboxSession] = []
 
         for session in expired_sessions:
-            with self._locker.lock(session.chat_id):
-                current_session = self._repository.get_active_by_chat_id(
-                    session.chat_id
-                )
-                now = self._clock.now()
-                if current_session is None:
-                    continue
-
-                if current_session.session_id != session.session_id:
-                    continue
-
-                if current_session.expires_at > now:
-                    continue
-
-                self._runtime.stop(current_session.container_id)
-                self._repository.delete(current_session.session_id)
-                cleaned_sessions.append(current_session)
-                self._logger.info(
-                    'sandbox_cleaned',
+            try:
+                cleaned_session = self._cleanup_session(session)
+            except Exception as exc:
+                self._logger.error(
+                    'sandbox_clean_failed',
                     attrs={
-                        'chat_id': current_session.chat_id,
-                        'session_id': current_session.session_id,
-                        'container_id': current_session.container_id,
+                        'chat_id': session.chat_id,
+                        'session_id': session.session_id,
+                        'container_id': session.container_id,
+                        'error': type(exc).__name__,
                     },
                 )
+                continue
+
+            if cleaned_session is None:
+                continue
+
+            cleaned_sessions.append(cleaned_session)
+            self._logger.info(
+                'sandbox_cleaned',
+                attrs={
+                    'chat_id': cleaned_session.chat_id,
+                    'session_id': cleaned_session.session_id,
+                    'container_id': cleaned_session.container_id,
+                },
+            )
 
         return cleaned_sessions
 
+    def _cleanup_session(self, session: SandboxSession) -> SandboxSession | None:
+        with self._locker.lock(session.chat_id):
+            current_session = self._repository.get_active_by_chat_id(session.chat_id)
+            now = self._clock.now()
+            if current_session is None:
+                return None
+
+            if current_session.session_id != session.session_id:
+                return None
+
+            if current_session.expires_at > now:
+                return None
+
+            self._runtime.stop(current_session.container_id)
+            self._repository.delete(current_session.session_id)
+            return current_session
+
 
 def _new_session_id() -> str:
     return uuid4().hex