Hound make chromedriver crash

[Sergiy Kukunin]

A simple snippet

      for i <- 1..10 do
        Hound.start_session()
        Hound.end_session()
        Hound.Session.active_sessions() |> Enum.count
      end

it crashes with

	** (Protocol.UndefinedError) protocol Enumerable not implemented for {:error, :closed}. This protocol is implemented for: DBConnection.PrepareStream, DBConnection.Stream, Date.Range, Ecto.Adapters.SQL.Stream, File.Stream, Function, GenEvent.Stream, HashDict, HashSet, IO.Stream, List, Map, MapSet, Postgrex.Stream, Range, Scrivener.Page, Stream
	      (elixir) /private/tmp/elixir-20181026-69137-ms45yr/elixir-1.7.4/lib/elixir/lib/enum.ex:1: Enumerable.impl_for!/1
	      (elixir) /private/tmp/elixir-20181026-69137-ms45yr/elixir-1.7.4/lib/elixir/lib/enum.ex:153: Enumerable.count/1
	      (elixir) lib/enum.ex:582: Enum.count/1
	      spec/mr_persistent/browser/polska_spec.exs:50: anonymous fn/2 in Mr.Browser.PolskaSpec.example_has_separate_sessions_sqfbykathncueomlixwvgzpdjr/1
	      (elixir) lib/enum.ex:2967: Enum.reduce_range_inc/4
	      spec/mr_persistent/browser/polska_spec.exs:47: Mr.Browser.PolskaSpec.example_has_separate_sessions_sqfbykathncueomlixwvgzpdjr/1
	      (espec) lib/espec/example_runner.ex:76: ESpec.ExampleRunner.try_run/3
	      (espec) lib/espec/example_runner.ex:43: ESpec.ExampleRunner.run_example/2

because active_sessions() returns {:error, :closed}

crashes the latest chromedriver 2.43 on macOS. Does someone have a similar behavior?
I use the latest hound from master branch.

Log:

[1541452568.237][INFO]: [9b4cf009b6aa25de713958aadfc025fe] RESPONSE InitSession {
   "acceptInsecureCerts": false,
   "acceptSslCerts": false,
   "applicationCacheEnabled": false,
   "browserConnectionEnabled": false,
   "browserName": "chrome",
   "chrome": {
      "chromedriverVersion": "2.43.600229 (3fae4d0cda5334b4f533bede5a4787f7b832d052)",
      "userDataDir": "/var/folders/p8/1862yljs6w5g7qq3bcxy4mxw0000gn/T/.org.chromium.Chromium.iDTtDU"
   },
   "cssSelectorsEnabled": true,
   "databaseEnabled": false,
   "goog:chromeOptions": {
      "debuggerAddress": "localhost:52569"
   },
   "handlesAlerts": true,
   "hasTouchScreen": false,
   "javascriptEnabled": true,
   "locationContextEnabled": true,
   "mobileEmulationEnabled": false,
   "nativeEvents": true,
   "networkConnectionEnabled": false,
   "pageLoadStrategy": "normal",
   "platform": "Mac OS X",
   "rotatable": false,
   "~~~": "..."
}
[1541452568.364][INFO]: [9b4cf009b6aa25de713958aadfc025fe] COMMAND Quit {

}
[1541452568.516][INFO]: [9b4cf009b6aa25de713958aadfc025fe] RESPONSE Quit
[1541452568.516][DEBUG]: Log type 'driver' lost 0 entries on destruction
[1541452568.516][DEBUG]: Log type 'browser' lost 0 entries on destruction
Segmentation fault: 11

[Thibaut Barrère]

Does someone have a similar behavior?

I am seeing something similar. In more details, if you do this:

    Hound.start_session(browser: "chrome_headless")
    Hound.end_session()
    Apex.ap Hound.Session.active_sessions()

You will get {:error, :closed} printed, but most importantly, Chromedriver will have crashed:

$ chromedriver
Starting ChromeDriver 2.45.615355 (d5698f682d8b2742017df6c81e0bd8e6a3063189) on port 9515
Only local connections are allowed.
Segmentation fault: 11

So I wonder if this may be an issue in Chromedriver itself, rather than hound.

[Sergiy Kukunin]

From my experience, that's chromedriver fault, its pretty unstable on Mac. The same code running on Linux works well. Hound doesn't send something special to chromedriver