[BugFix] Fix clean shutdown issues (#8492)

vllm/executor/ray_tpu_executor.py

@@ -26,6 +26,8 @@ logger = init_logger(__name__)
 
 class RayTPUExecutor(TPUExecutor):
 
+    uses_ray: bool = True
+
     def __init__(self, *args, **kwargs):
         # This is non-None when the execute model loop is running
         # in the parallel workers. It's a coroutine in the AsyncLLMEngine case.