C++基于Boost.Asio的多线程WebSocket客户端EXC_BAD_ACCESS问题排查

我使用Boost.Beast和Boost.Asio开发C++多线程WebSocket客户端，用于处理服务器的实时数据流。偶尔会在WebSocket握手过程（do_handshake方法）中遇到段错误（EXC_BAD_ACCESS）。

WebSocketClient类简化版本： #

class WebSocketClient
{
private:
    OrderBook &orderBook_;
    string coin_;

    boost::asio::io_context ioc_;
    tcp::resolver resolver_;
    ssl::context ssl_context_;
    websocket::stream<boost::asio::ssl::stream<tcp::socket>> ws_;

public:
    WebSocketClient(OrderBook &orderBook, const string &coin)
        : orderBook_(orderBook),
          coin_(coin),
          resolver_(ioc_),
          ssl_context_(ssl::context::tlsv12_client),
          ws_(ioc_, ssl_context_)
    {
        ssl_context_.set_default_verify_paths();
        ws_.next_layer().set_verify_mode(ssl::verify_peer);
        ws_.next_layer().set_verify_callback(ssl::rfc2818_verification("stream.binance.com"));
    }

    void connectAndSubscribe()
    {
        try
        {
            cout << "&ws_ = " << &ws_ << endl;
            // 解析主机名并连接服务器
            auto const results = resolver_.resolve("stream.binance.com", "9443");
            auto ep = boost::asio::connect(ws_.next_layer().next_layer(), results);
            string host_ = "stream.binance.com:" + to_string(ep.port());

            ws_.next_layer().handshake(ssl::stream_base::client);
            // 设置装饰器修改握手的User-Agent
            ws_.set_option(websocket::stream_base::decorator(
                [](websocket::request_type &req)
                {
                    req.set(boost::beast::http::field::user_agent,
                            string(BOOST_BEAST_VERSION_STRING) + " websocket-client");
                }));

            string path = "/ws/" + coin_ + "@depth5@100ms";
            ws_.handshake(host_, path);
            cout << "Handshake successful." << endl;

            string msg = "{\"method\": \"SUBSCRIBE\", \"params\": [\"" + coin_ + "@depth5@100ms\"], \"id\": 1}";
            send(msg);
            cout << "Subscription request done!" << endl;
        }
        catch (const std::exception &e)
        {
            cout << "Error in connectAndSubscribe: " << e.what() << endl;
            throw; // 重新抛出以便调用者捕获
        }
    }
};

该类在多线程环境中使用，每个线程创建一个WebSocketClient实例处理连接。崩溃偶发，堆栈追踪指向do_handshake方法。

我已检查对象生命周期：ssl_context_、resolver_、ws_等均为WebSocketClient类成员，且OrderBook对象生命周期长于WebSocketClient实例。

lldb终端信息： #

* thread #5, stop reason = EXC_BAD_ACCESS (code=EXC_I386_GPFLT)
    frame #0: 0x000000010003a28b adabtc`void boost::beast::websocket::stream<boost::asio::ssl::stream<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::any_io_executor>>, true>::do_handshake<void (*)(boost::beast::http::message<true, boost::beast::http::empty_body, boost::beast::http::basic_fields<std::__1::allocator<char>>>&)>(boost::beast::http::message<false, boost::beast::http::basic_string_body<char, std::__1::char_traits<char>, std::__1::allocator<char>>, boost::beast::http::basic_fields<std::__1::allocator<char>>>*, boost::core::basic_string_view<char>, boost::core::basic_string_view<char>, void (* const&)(boost::beast::http::message<true, boost::beast::http::empty_body, boost::beast::http::basic_fields<std::__1::allocator<char>>>&), boost::system::error_code&) + 843
adabtc`boost::beast::websocket::stream<boost::asio::ssl::stream<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::any_io_executor>>, true>::do_handshake<void (*)(boost::beast::http::message<true, boost::beast::http::empty_body, boost::beast::http::basic_fields<std::__1::allocator<char>>>&)>:->  0x10003a28b <+843>: vmovaps 0x40(%rax), %ymm0
    0x10003a290 <+848>: leaq   0x2210(%rsp), %rax
    0x10003a298 <+856>: vmovups %ymm0, (%rax)
    0x10003a29c <+860>: movq   %r13, %r12
Target 0: (adabtc) stopped.

内容的提问来源于stack exchange，提问作者Pedro Souto