使用Net::SSH执行rails console时SSH终端冻结问题排查

我正在构建一个基于Web的SSH终端：UI采用Xterm.js，后端使用Net::SSH，网站与后端通过ActionCable通道（WebSocket）通信。nano、vim等交互工具均可正常运行，但执行bundle exec rails c命令打开Ruby on Rails控制台时，终端会陷入无响应状态。已确认ssh_channel.send_data payload.dig("data", "cmd")已被调用，但channel.on_data不再接收任何数据。

相关代码如下：

# Entry point
def start(payload)
  connect!
  open_channel!
  open_connection_thread!
  broadcast_reply(payload["id"], "login", { result: :successful })
end

# Every single key typed in Xterm.js is passed here.
def cmd(payload)
  ssh_channel.send_data payload.dig("data", "cmd")
end

private

attr_accessor :ssh_client, :ssh_channel, :thread

def connect!
  self.ssh_client ||= Net::SSH.start(
    "host_ip",
    "username",
    keys_only: true,
    use_agent: false,
    key_data: [ssh_private_key]
  )
end

def open_channel! # rubocop:disable Metrics/MethodLength
  self.ssh_channel ||= ssh_client.open_channel do |channel|
    channel.request_pty(term: "xterm-256color") do |ch, success|
      raise "Error requesting pty" unless success

      ch.send_channel_request("shell") do |_, result|
        raise "Error opening shell" unless result
      end
    end

    channel.on_data do |_, data|
      broadcast_reply(nil, :cmd_output, data)
    end

    channel.on_extended_data do |_, _, data|
      broadcast_reply(nil, :cmd_output, data)
    end

    channel.on_close { }
  end
end

def open_connection_thread!
  self.thread ||= Thread.new do
    # This is blocking and could be done outside a thread because the callbacks are called anyway.
    # However, this appears safer.
    ssh_client.loop(0.1)
  end
end

终端冻结状态：显示"Loading Rails environment (Rails x.x.x)"后停止输出，无任何响应。

不清楚该从何处入手排查，任何线索都将十分感激！
注：测试过在线SSH客户端ssheasy.com可正常执行该命令，我的实现哪里存在问题？

内容的提问来源于stack exchange，提问作者James St-Pierre