[2020/09/25 21:59:57.013]   File "/data/mci/bf378576eef557fd157a81fc32b8b34c/src/buildscripts/resmokelib/run/__init__.py", line 234, in _execute_suite
[2020/09/25 21:59:57.013]     executor.run()
[2020/09/25 21:59:57.013]   File "/data/mci/bf378576eef557fd157a81fc32b8b34c/src/buildscripts/resmokelib/testing/executor.py", line 120, in run
[2020/09/25 21:59:57.013]     (report, interrupted) = self._run_tests(test_queue, setup_flag, teardown_flag)
[2020/09/25 21:59:57.013]   File "/data/mci/bf378576eef557fd157a81fc32b8b34c/src/buildscripts/resmokelib/testing/executor.py", line 196, in _run_tests
[2020/09/25 21:59:57.015]     joined = test_queue.join(TestSuiteExecutor._TIMEOUT)
[2020/09/25 21:59:57.015]   File "/data/mci/bf378576eef557fd157a81fc32b8b34c/src/buildscripts/resmokelib/utils/queue.py", line 43, in join
[2020/09/25 21:59:57.025]     self.all_tasks_done.wait(remaining)
[2020/09/25 21:59:57.025]   File "/opt/mongodbtoolchain/stow/osx-python3-v3.kRB/lib/python3.7/threading.py", line 300, in wait
[2020/09/25 21:59:57.025]     gotit = waiter.acquire(True, timeout)
[2020/09/25 21:59:57.025]   File "/data/mci/bf378576eef557fd157a81fc32b8b34c/src/buildscripts/resmokelib/sighandler.py", line 37, in _handle_sigusr1
[2020/09/25 21:59:57.025]     _dump_and_log(header_msg)
[2020/09/25 21:59:57.025]   File "/data/mci/bf378576eef557fd157a81fc32b8b34c/src/buildscripts/resmokelib/sighandler.py", line 63, in _dump_and_log
[2020/09/25 21:59:57.026]     reportfile.write(suites)
[2020/09/25 21:59:57.026]   File "/data/mci/bf378576eef557fd157a81fc32b8b34c/src/buildscripts/resmokelib/reportfile.py", line 19, in write
[2020/09/25 21:59:57.026]     combined_report_dict = _report.TestReport.combine(*reports).as_dict()
[2020/09/25 21:59:57.026]   File "/data/mci/bf378576eef557fd157a81fc32b8b34c/src/buildscripts/resmokelib/testing/report.py", line 284, in as_dict
[2020/09/25 21:59:57.026]     "elapsed": test_info.end_time - test_info.start_time,
[2020/09/25 21:59:57.026] TypeError: unsupported operand type(s) for -: 'float' and 'NoneType'