[Bugfix] fix TypeError when log-requests-level >=2 in prefill node warmup (#17129)

python/sglang/srt/utils/request_logger.py

@@ -117,7 +117,14 @@ class RequestLogger:
             and obj.input_ids is not None
             and tokenizer is not None
         ):
-            decoded = tokenizer.decode(obj.input_ids, skip_special_tokens=False)
+            if obj.input_ids and isinstance(obj.input_ids[0], list):
+                # Prefill node warmup while PD disaggregated.
+                decoded = [
+                    tokenizer.decode(_input_ids, skip_special_tokens=False)
+                    for _input_ids in obj.input_ids
+                ]
+            else:
+                decoded = tokenizer.decode(obj.input_ids, skip_special_tokens=False)
             obj.text = decoded
 
     def log_finished_request(