From efc1d8d408f0a1c660975c18f103c76270a3075d Mon Sep 17 00:00:00 2001
From: Cloud Wu <cloudwu@gmail.com>
Date: Fri, 5 Jun 2026 07:22:28 +0800
Subject: [PATCH] fix #2155

---
 lualib/skynet/db/mongo.lua | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lualib/skynet/db/mongo.lua b/lualib/skynet/db/mongo.lua
index 23649984..c34323c9 100644
--- a/lualib/skynet/db/mongo.lua
+++ b/lualib/skynet/db/mongo.lua
@@ -217,7 +217,8 @@ function mongo_client:disconnect()
 end
 
 function mongo_client:genId()
-	local id = self.__id + 1
+	-- id should be int32, See https://github.com/cloudwu/skynet/issues/2155
+	local id = (self.__id + 1) & 0x7fffffff
 	self.__id =	id
 	return id
 end