GRPC中无法存储变量地址或者值？

在RPC函数中无法存储局部变量的值和地址

protobuf文件
syntax = "proto3";

package message;
option go_package = "proto/;message";

service CreatorRoom{
  rpc Creator (CreatorRoomReq) returns (CreatorRoomRes);
  rpc JoinRoom (JoinRoomReq) returns (JoinRoomRes);
}

所使用的结构体

type ClothesRoom struct {
    RoomId string
    Space string 
    Information map[string] *WholeRoom 
    Identification bool 
    TimeOut bool 
    CountDown int 
    WhoShot string
    CardLib map[string][]int 
}


func (rm *ClothesRoom) CreatorRoom(roomName string){
    rm.RoomId = roomName
    rm.Space = "55555555"
    rm.Identification = false
    rm.TimeOut= false
    rm.CountDown= -1
    rm.CardLib= make(map[string][]int)

}

grpc处理请求函数

func (poto * ProtoMessage) JoinRoom(cxt context.Context,in *pd.JoinRoomReq)(*pd.JoinRoomRes,error) {
    coco:= new(ClothesRoom)
    coco.CreatorRoom("lindejiang")
    //UserList.GameServerMapList.RoomList是全局变量
    UserList.GameServerMapList.RoomList[joinRoom.RoomId] = coco
}

下次再进来这个函数打印UserList.GameServerMapList.RoomList里面存的值得时候发现 里面存储的内存地址无效了，也就是出了JoinRoom这个函数之后就被gc了，我也尝试闭包也是会这样 上面UserList.GameServerMapList.RoomList[joinRoom.RoomId] = coco 出了函数之后就gc掉了 这就导致map里面存储的内存地址无效了导致报错

key：888999这个在别的函数存储一直都可以访问，key:545783是在grpc JoinRoom函数里存储的，出了函数就被gc掉了，内存地址是无效的，导致下面的错误
map[545783:0xc000208320 888999:0xc000096000]
panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xc0000005 code=0x0 addr=0x8 pc=0x8ece5f]