[V1] Fix detokenizer ports (#10224)

Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>

vllm/v1/tokenizer/detokenizer.py

@@ -48,11 +48,13 @@ class Detokenizer:
         # For example, it does not terminate properly. We need to improve this.
         self.push_port = get_open_port()
         self.pull_port = get_open_port()
+        # NOTE: The push port of the engine process should be the same as the
+        # pull port of the detokenizer process. Vice versa.
         self.detokenizer = DetokenizerProc(tokenizer_name=tokenizer_name,
                                            tokenizer_mode=tokenizer_mode,
                                            trust_remote_code=trust_remote_code,
-                                           push_port=self.push_port,
-                                           pull_port=self.pull_port)
+                                           push_port=self.pull_port,
+                                           pull_port=self.push_port)
         self.detokenizer.start()
 
         self.zmq_context = zmq.Context()
@@ -95,8 +97,8 @@ class DetokenizerProc(multiprocessing.Process):
         self.tokenizer_name = tokenizer_name
         self.tokenizer_mode = tokenizer_mode
         self.trust_remote_code = trust_remote_code
-        # NOTE: The pull_port of the detokenizer should be the same as the
-        # push_port of the engine. Vice versa.
+        # NOTE: The pull_port of the detokenizer process should be the same as
+        # the push_port of the engine process. Vice versa.
         self.pull_port = pull_port
         self.push_port = push_port