Exception when using R25 with kernel "backend socket" setting

[nhpip]

Running version 1.2.0

Looking at ssl.recv it expects a record #sslsocket{}, clearly that's not the case here.

Possible Erlang bug?

%FunctionClauseError{
  args: nil,
  arity: 3,
  clauses: nil,
  function: :recv,
  kind: nil,
  module: :ssl
}
Stack trace:
[
  {:ssl, :recv,
   [
     {:"$inet", :gen_tcp_socket,
      {#PID<0.2479.0>, {:"$socket", #Reference<0.1046277591.1572208641.9904>}}},
     0,
     1200000
   ], [file: 'ssl.erl', line: 885]},
  {:gen_smtp_client, :read_possible_multiline_reply, 1,
   [
     file: '/collection_server/src/collection_server/deps/gen_smtp/src/gen_smtp_client.erl',
     line: 839
   ]},
  {:gen_smtp_client, :connect, 2,
   [
     file: '/collection_server/src/collection_server/deps/gen_smtp/src/gen_smtp_client.erl',
     line: 822
   ]},
  {:gen_smtp_client, :open_smtp_session, 2,
   [
     file: '/collection_server/src/collection_server/deps/gen_smtp/src/gen_smtp_client.erl',
     line: 378
   ]},
  {:gen_smtp_client, :try_smtp_sessions, 3,
   [
     file: '/collection_server/src/collection_server/deps/gen_smtp/src/gen_smtp_client.erl',
     line: 316
   ]},
  {:gen_smtp_client, :send_it, 2,
   [
     file: '/collection_server/src/collection_server/deps/gen_smtp/src/gen_smtp_client.erl',
     line: 289
   ]},

[seriyps]

I think it's because we have explicit is_port(Sock) here

gen_smtp/src/smtp_socket.erl

Line 179 in 99fad81

recv(Socket, Length, Timeout) when is_port(Socket) ->

[nhpip]

So I did a quick experiment and it seemed to get it working. Probably needs more extensive tests, especially on pre-R24/R25:
nhpip@db38e85