From 3c3d6255d92685f10ae959705104436cd1939d2f Mon Sep 17 00:00:00 2001
From: Hank Han <54751605+HanHan009527@users.noreply.github.com>
Date: Sat, 4 Oct 2025 04:39:59 +0800
Subject: [PATCH] [fix]missing prefix_lens_cpu init when p/d disaggregation
 (#11196)

---
 python/sglang/srt/disaggregation/decode.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/python/sglang/srt/disaggregation/decode.py b/python/sglang/srt/disaggregation/decode.py
index de26d351f..a0b6de7f4 100644
--- a/python/sglang/srt/disaggregation/decode.py
+++ b/python/sglang/srt/disaggregation/decode.py
@@ -523,11 +523,19 @@ class DecodePreallocQueue:
                     dtype=torch.int64,
                     device=self.token_to_kv_pool_allocator.device,
                 ),
+                prefix_lens_cpu=torch.tensor(
+                    [0],
+                    dtype=torch.int64,
+                ),
                 seq_lens=torch.tensor(
                     [num_tokens],
                     dtype=torch.int64,
                     device=self.token_to_kv_pool_allocator.device,
                 ),
+                seq_lens_cpu=torch.tensor(
+                    [num_tokens],
+                    dtype=torch.int64,
+                ),
                 last_loc=torch.tensor(
                     [-1],
                     dtype=torch.int64,