Hi,

I have noticed that Application.stop/1 calls are no longer being reported by erlang’s :error_logger in the same way with version 1.15.0. It was working with version 1.14.5.

See this sample module for an example. I use poison as the application to stop, but it could be any application that has started:

defmodule GenEventTester do
  @moduledoc """
  Documentation for `GenEventTester`.
  """
  @behaviour :gen_event
  require Logger

  @impl :gen_event
  def init(_) do
    Logger.notice("init/1 has been called")
    {:ok, %{}}
  end

  @impl :gen_event
  def handle_event(msg, state) do
    Logger.notice("handle_event/2 has been called: #{inspect(msg)}")
    {:ok, state}
  end

  @impl :gen_event
  def handle_call(msg, state) do
    Logger.notice("handle_call/2 has been called: #{inspect(msg)}")
    {:ok, :ok, state}
  end
end

Running this with Elixir 1.14.5:

Erlang/OTP 26 [erts-14.2.5] [source] [64-bit] [smp:4:4] [ds:4:4:10] [async-threads:1] [jit:ns]

==> poison
Compiling 4 files (.ex)
Generated poison app
==> gen_event_tester
Compiling 1 file (.ex)
Generated gen_event_tester app
Interactive Elixir (1.14.5) - press Ctrl+C to exit (type h() ENTER for help)
iex(1)> :error_logger.add_report_handler GenEventTester, []

09:08:57.338 [notice] init/1 has been called
:ok
iex(2)> Application.stop :poison

09:09:08.441 [notice] handle_event/2 has been called: {:info_report, #PID<0.70.0>, {#PID<0.44.0>, :std_info, [application: :poison, exited: :stopped, type: :temporary]}}
:ok

09:09:08.441 [notice] Application poison exited: :stopped
iex(3)>

Running this with Elixir 1.15.0:

Erlang/OTP 26 [erts-14.2.5] [source] [64-bit] [smp:4:4] [ds:4:4:10] [async-threads:1] [jit:ns]

Interactive Elixir (1.15.0) - press Ctrl+C to exit (type h() ENTER for help)
iex(1)> :error_logger.add_report_handler GenEventTester, []

09:10:53.747 [notice] init/1 has been called
:ok
iex(2)>  Application.stop :poison

09:11:08.419 [notice] Application poison exited: :stopped
:ok
iex(3)>

Interestingly, the gen_event behaviour is being used somewhat, as the init/1 callback is called.

Does anybody know how to get the handle_event/2 callbacks to be called with Elixir 1.15.0, and/or know why this is happening?