Merge pull request #11913 from apolcyn/debug_new_ruby_flake

Fix ruby test flake

src/ruby/spec/generic/client_stub_spec.rb

@@ -451,10 +451,31 @@ describe 'ClientStub' do
                            /Header values must be of type string or array/)
       end
 
+      def run_server_streamer_against_client_with_unmarshal_error(
+        expected_input, replys)
+        wakey_thread do |notifier|
+          c = expect_server_to_be_invoked(notifier)
+          expect(c.remote_read).to eq(expected_input)
+          begin
+            replys.each { |r| c.remote_send(r) }
+          rescue GRPC::Core::CallError
+            # An attempt to write to the client might fail. This is ok
+            # because the client call is expected to fail when
+            # unmarshalling the first response, and to cancel the call,
+            # and there is a race as for when the server-side call will
+            # start to fail.
+            p 'remote_send failed (allowed because call expected to cancel)'
+          ensure
+            c.send_status(OK, 'OK', true)
+          end
+        end
+      end
+
       it 'the call terminates when there is an unmarshalling error' do
         server_port = create_test_server
         host = "localhost:#{server_port}"
-        th = run_server_streamer(@sent_msg, @replys, @pass)
+        th = run_server_streamer_against_client_with_unmarshal_error(
+          @sent_msg, @replys)
         stub = GRPC::ClientStub.new(host, :this_channel_is_insecure)
 
         unmarshal = proc { fail(ArgumentError, 'test unmarshalling error') }