[Core] print error before deadlock (#3459)

vllm/engine/ray_utils.py

@@ -33,8 +33,17 @@ def __getattr__(self, name):
             return getattr(self.worker, name)
 
         def execute_method(self, method, *args, **kwargs):
-            executor = getattr(self, method)
-            return executor(*args, **kwargs)
+            try:
+                executor = getattr(self, method)
+                return executor(*args, **kwargs)
+            except Exception as e:
+                # exceptions in ray worker may cause deadlock
+                # see https://github.com/vllm-project/vllm/issues/3455
+                # print the error and inform the user to solve the error
+                msg = (f"Error executing method {method}. "
+                       "This might cause deadlock in distributed execution.")
+                logger.exception(msg)
+                raise e
 
         def get_node_ip(self) -> str:
             return get_ip()