From 0198ddf95c1d8f6394aacba76719b4f91aaa28f8 Mon Sep 17 00:00:00 2001
From: Ivan Efimov <efimov-ivan@yandex-team.ru>
Date: Tue, 9 Jun 2026 12:37:23 +0200
Subject: Fix vhost evloop contention failing partition tests (#42863)

---
 ydb/core/nbs/cloud/blockstore/bootstrap/bootstrap.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ydb/core/nbs/cloud/blockstore/bootstrap/bootstrap.cpp b/ydb/core/nbs/cloud/blockstore/bootstrap/bootstrap.cpp
index 249d7c06b9c..62eb7b686d2 100644
--- a/ydb/core/nbs/cloud/blockstore/bootstrap/bootstrap.cpp
+++ b/ydb/core/nbs/cloud/blockstore/bootstrap/bootstrap.cpp
@@ -89,6 +89,9 @@ const NKikimrConfig::TNbsConfig& TNbsService::GetConfig() const
 
 void CreateNbsService(const NKikimrConfig::TNbsConfig& config)
 {
+    // Ensure existing NbsService (if any) is destroyed BEFORE a new one
+    // is constructed to prevent global vhost queue contention.
+    NbsService = nullptr;
     NbsService = std::make_shared<TNbsService>(config);
 }
 
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