[misc][distributed] fix pp missing layer condition (#6446)

Author: youkaichao

vllm/model_executor/models/utils.py

@@ -83,7 +83,10 @@ def get_pp_missing_layer_names(model: torch.nn.Module) -> List[str]:
     missing_layer_names = []
     for name, module in model.named_modules():
         if isinstance(module, PPMissingLayer):
-            missing_layer_names.append(name)
+            # NOTE: the trailing dot is used to match the prefix of the layer.
+            # without the dot, we could match a layer that is not missing,
+            # e.g., 'encoder.layer.1' would match 'encoder.layer.11'
+            missing_layer_names.append(name + '.')
     _model_to_pp_missing_layer_names[model_id] = missing_layer_names
 
     return missing_layer_names