SIGTERM signal receivedTraceback(most recent call last):
  File "/app/webkit/Tools/Scripts/run-webkit-tests", line 46, in <module>
    sys.exit(main(sys.argv[1:], sys.stdout, sys.stderr))
  File "/app/webkit/Tools/Scripts/webkitpy/layout_tests/run_webkit_tests.py", line 92, in main
    run_details = run(port, options, args, stderr)
  File "/app/webkit/Tools/Scripts/webkitpy/layout_tests/run_webkit_tests.py", line 487, in run
    run_details = manager.run(args)
  File "/app/webkit/Tools/Scripts/webkitpy/layout_tests/controllers/manager.py", line 408, in run
    temp_initial_results, temp_retry_results, temp_enabled_pixel_tests_in_retry = self._run_test_subset(test_inputs, device_type=device_type)
  File "/app/webkit/Tools/Scripts/webkitpy/layout_tests/controllers/manager.py", line 482, in _run_test_subset
    initial_results = self._run_tests(test_inputs, self._options.repeat_each, self._options.iterations, int(self._options.child_processes), retrying=False, device_type=device_type)
  File "/app/webkit/Tools/Scripts/webkitpy/layout_tests/controllers/manager.py", line 561, in _run_tests
    return self._runner.run_tests(self._expectations[device_type], new_test_inputs, num_workers, retrying, device_type)
  File "/app/webkit/Tools/Scripts/webkitpy/layout_tests/controllers/layout_test_runner.py", line 172, in run_tests
    ), teardown=teardown_shard,
  File "/app/webkit/Tools/Scripts/libraries/webkitcorepy/webkitcorepy/task_pool.py", line 388, in __enter__
    worker.start()
  File "/usr/lib/python2.7/multiprocessing/process.py", line 130, in start
    self._popen = Popen(self)
  File "/usr/lib/python2.7/multiprocessing/forking.py", line 126, in __init__
    code = process_obj._bootstrap()
  File "/usr/lib/python2.7/multiprocessing/process.py", line 267, in _bootstrap
    self.run()
  File "/usr/lib/python2.7/multiprocessing/process.py", line 114, in run
    self._target(*self._args, **self._kwargs)
  File "/app/webkit/Tools/Scripts/libraries/webkitcorepy/webkitcorepy/task_pool.py", line 310, in main
    cls.queue.close()
  File "/app/webkit/Tools/Scripts/libraries/webkitcorepy/webkitcorepy/task_pool.py", line 158, in close
    self.outgoing.join_thread()
  File "/usr/lib/python2.7/multiprocessing/queues.py", line 171, in join_thread
    self._jointhread()
  File "/usr/lib/python2.7/multiprocessing/util.py", line 207, in __call__
    res = self._callback(*self._args, **self._kwargs)
  File "/usr/lib/python2.7/multiprocessing/queues.py", line 218, in _finalize_join
    thread.join()
  File "/usr/lib/python2.7/threading.py", line 940, in join
    self.__block.wait()
  File "/usr/lib/python2.7/threading.py", line 340, in wait
    waiter.acquire()