Ensure stacktrace is list in LoggerBackend

lib/sentry/logger_backend.ex

@@ -76,7 +76,7 @@ defmodule Sentry.LoggerBackend do
       end
 
     case Keyword.get(meta, :crash_reason) do
-      {reason, stacktrace} ->
+      {reason, stacktrace} when is_list(stacktrace) ->
         if ignore_plug &&
              Enum.any?(stacktrace, fn {module, function, arity, _file_line} ->
                match?({^module, ^function, ^arity}, {Plug.Cowboy.Handler, :init, 2}) ||
@@ -93,6 +93,11 @@ defmodule Sentry.LoggerBackend do
           Sentry.capture_exception(reason, opts)
         end
 
+      {{_reason, stacktrace}, {_m, _f, args}} when is_list(stacktrace) and is_list(args) ->
+        # Cowboy stuff
+        # https://github.com/ninenines/cowboy/blob/master/src/cowboy_stream_h.erl#L148-L151
+        :ok
+
       reason when is_atom(reason) and not is_nil(reason) ->
         Sentry.capture_exception(reason, [{:event_source, :logger} | opts])
 

test/logger_backend_test.exs

@@ -149,6 +149,40 @@ defmodule Sentry.LoggerBackendTest do
     end)
   end
 
+  test "GenServer timeout makes call to Sentry API" do
+    self_pid = self()
+    Process.flag(:trap_exit, true)
+    bypass = Bypass.open()
+
+    Bypass.expect(bypass, fn conn ->
+      {:ok, body, conn} = Plug.Conn.read_body(conn)
+      json = Jason.decode!(body)
+
+      exception_value =
+        List.first(json["exception"])
+        |> Map.fetch!("value")
+
+      assert String.contains?(exception_value, "{:timeout, {GenServer, :call")
+
+      assert conn.request_path == "/api/1/store/"
+      assert conn.method == "POST"
+      send(self_pid, "API called")
+      Plug.Conn.resp(conn, 200, ~s<{"id": "340"}>)
+    end)
+
+    modify_env(:sentry, dsn: "http://public:secret@localhost:#{bypass.port}/1")
+
+    {:ok, pid1} = Sentry.TestGenServer.start_link(self_pid)
+
+    capture_log(fn ->
+      Task.start(fn ->
+        GenServer.call(pid1, {:sleep, 20}, 1)
+      end)
+
+      assert_receive "API called"
+    end)
+  end
+
   test "only sends one error when a Plug process crashes" do
     Code.compile_string("""
       defmodule SentryApp do