https://0fd1d1bf6-dot-waterfall-frontend-dot-findit-for-me.appspot.com/waterfall/build-failure?url=https://luci-milo.appspot.com/buildbot/chromium.chromiumos/ChromiumOS%20x86-generic%20Compile/35937&debug=1

The try job result is stuck at pending

According to the logs, there may be an error in callback():

expected string or buffer (/base/data/home/runtimes/python27_experiment/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py:1552)
Traceback (most recent call last):
  File "/base/data/home/runtimes/python27_experiment/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1535, in __call__
    rv = self.handle_exception(request, response, e)
  File "/base/data/home/runtimes/python27_experiment/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1529, in __call__
    rv = self.router.dispatch(request, response)
  File "/base/data/home/apps/s~findit-for-me/waterfall-backend:0fd1d1bf6.402304082303675481/first_party/gae_ts_mon/config.py", line 256, in dispatch
    time_fn=time_fn)
  File "/base/data/home/apps/s~findit-for-me/waterfall-backend:0fd1d1bf6.402304082303675481/first_party/gae_ts_mon/config.py", line 218, in _instrumented_dispatcher
    ret = dispatcher(request, response)
  File "/base/data/home/runtimes/python27_experiment/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1278, in default_dispatcher
    return route.handler_adapter(request, response)
  File "/base/data/home/runtimes/python27_experiment/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1102, in __call__
    return handler.dispatch()
  File "/base/data/home/runtimes/python27_experiment/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 572, in dispatch
    return self.handle_exception(e, self.app.debug)
  File "/base/data/home/runtimes/python27_experiment/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 570, in dispatch
    return method(*args, **kwargs)
  File "/base/data/home/apps/s~findit-for-me/waterfall-backend:0fd1d1bf6.402304082303675481/first_party/pipeline_utils/appengine_third_party_pipeline_python_src_pipeline/pipeline.py", line 2786, in get
    self.run_callback()
  File "/base/data/home/apps/s~findit-for-me/waterfall-backend:0fd1d1bf6.402304082303675481/first_party/pipeline_utils/appengine_third_party_pipeline_python_src_pipeline/pipeline.py", line 2863, in run_callback
    callback_result = perform_callback()
  File "/base/data/home/apps/s~findit-for-me/waterfall-backend:0fd1d1bf6.402304082303675481/first_party/pipeline_utils/appengine_third_party_pipeline_python_src_pipeline/pipeline.py", line 2853, in perform_callback
    return stage._callback_internal(kwargs)
  File "/base/data/home/apps/s~findit-for-me/waterfall-backend:0fd1d1bf6.402304082303675481/first_party/pipeline_utils/appengine_third_party_pipeline_python_src_pipeline/pipeline.py", line 1099, in _callback_internal
    return self.callback(**kwargs)
  File "/base/data/home/apps/s~findit-for-me/waterfall-backend:0fd1d1bf6.402304082303675481/waterfall/monitor_try_job_pipeline.py", line 417, in callback
    return self._callback(**kwargs)
  File "/base/data/home/apps/s~findit-for-me/waterfall-backend:0fd1d1bf6.402304082303675481/waterfall/monitor_try_job_pipeline.py", line 476, in _callback
    swarming_task_id = buildbot.GetSwarmingTaskIdFromUrl(build.url)
  File "/base/data/home/apps/s~findit-for-me/waterfall-backend:0fd1d1bf6.402304082303675481/waterfall/buildbot.py", line 134, in GetSwarmingTaskIdFromUrl
    swarming_match = _MILO_SWARMING_TASK_URL_PATTERN.match(url)
TypeError: expected string or buffer