@@ -18,12 +18,22 @@ def _loop_asyncio(kernel):

         loop.call_later(kernel._poll_interval, kernel_handler)

     loop.call_soon(kernel_handler)

-    try:

-        if not loop.is_running():

+    # loop is already running (e.g. tornado 5), nothing left to do

+    if loop.is_running():

+        return

+    while True:

+        error = None

+        try:

             loop.run_forever()

-    finally:

+        except KeyboardInterrupt:

+            continue

+        except Exception as e:

+            error = e

         loop.run_until_complete(loop.shutdown_asyncgens())

         loop.close()

+        if error is not None:

+            raise error

+        break

 def notebook_extension():