why this socket.async_connect call failed,WHAT i miss here?

[algoqt]

run code bellow，case2 failed but if comment out the case 1 code，the case 2 code: socket.async_connect(endpoint, std::bind(handle_connect, std::placeholders::_1, endpoint)); works fine. what make these two seem have conflict？？？ seems when actual running case 2 code the io_service has stopped

#include <iostream>
#include <boost/asio.hpp>

using namespace boost::asio;
using ip::tcp;

void handle_connect(const boost::system::error_code& error, const tcp::endpoint& endpoint) {
    if (!error) {
        std::cout << "socket.async_connect Connected successfully!" << std::endl;
    }
    else {
        std::cout << "socket.async_connect Error ... " << error.message() << std::endl;
    }
}

int main() {
    boost::asio::io_service         io_service;

    boost::asio::ip::tcp::socket    socket(io_service);
    boost::asio::io_service::work   wr(io_service);
    boost::asio::steady_timer       timer(io_service);

    auto m_resolver = boost::asio::ip::tcp::resolver(io_service);
    boost::asio::ip::tcp::resolver::query query("www.baidu.com", "80");
    tcp::resolver::results_type results = m_resolver.resolve(query);
    boost::asio::ip::tcp::endpoint endpoint(boost::asio::ip::address::from_string("240e:ff:e020:966:0:ff:b042:f296"), 80);

    io_service.post([&wr, &timer]() {
        std::cout << "sleep 3 seconds then stop io service..." << std::endl;
        timer.expires_from_now(std::chrono::seconds(3));
        timer.async_wait([&wr](const boost::system::error_code& error) {wr.get_io_context().stop(); });
        }
    );
    // case 1:this works , but if comment this, the case 2 works.
    io_service.post([&socket, &results]() {
        boost::asio::async_connect(socket, results, [](const boost::system::error_code& error, const tcp::endpoint& endpoint) {
            if (!error) {
                std::cout << "io_service post job Connected successfully!!!!!" << std::endl;
            }
            else {
                std::cout << "Error during connection: " << error.message() << std::endl;
            }
            });
        });

    std::cout << "io_service begin.." << std::endl;
    // case 2: why this fail!!
    socket.async_connect(endpoint, std::bind(handle_connect, std::placeholders::_1, endpoint));

    io_service.run();

    std::cout << "io_service end.." << std::endl;

    char a = getchar();

    return 0;
}