From 41269264845867c4683ed683ce1fa48a26a8b22e Mon Sep 17 00:00:00 2001
From: taking-lying-flat <1615405@qq.com>
Date: Sat, 3 Oct 2026 12:27:03 +0800
Subject: [PATCH] Fix AlltoallvOptions retaining stale split metadata

---
 gloo/alltoallv.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gloo/alltoallv.cc b/gloo/alltoallv.cc
index 7a51f9527..f3a523d6c 100644
--- a/gloo/alltoallv.cc
+++ b/gloo/alltoallv.cc
@@ -21,6 +21,8 @@ static void splitOffsetsAndLengths(
     size_t elementSize,
     std::vector<size_t>& offsets,
     std::vector<size_t>& lengths) {
+  offsets.clear();
+  lengths.clear();
   size_t offset = 0;
   for (size_t elements : elementsPerRank) {
     size_t length = elements * elementSize;