A GenServer that will experience intermittent crashes due to timeouts

greeter.ex

defmodule Greeter do
  use GenServer

  def start_link(opts) do
    name = Access.get(opts, :name, __MODULE__)
    GenServer.start_link(__MODULE__, name, name: name)
  end

  def greet(server \\ __MODULE__, name) do
    GenServer.call(server, {:greet, name})
  end

  @impl GenServer
  def init(server_name) do
    :timer.send_interval(20_000, self(), :sleep)
    {:ok, server_name}
  end

  # Depending on where we are in the :sleep handler, we'll time out
  # before getting into the body of this!
  @impl GenServer
  def handle_call({:greet, name}, _from, server_name) do
    {:reply, "Hello #{name}, I'm #{server_name}", server_name}
  end

  @impl GenServer
  def handle_info(:sleep, server_name) do
    Process.sleep(10_000)
    {:noreply, server_name}
  end
end