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hanging when I use --time-methid=signal

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新手友好度
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Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
停滞
技术栈
python
领域
testing-qa

调研方向

使用所示的 pytest.main 循环和 --timeout-method=signal 重现挂起,然后检查 iree/tests/e2e/dlc_specific/test_runner.py 的超时输出,尤其是 thread_task、run_test、run_in_backend 和 subprocess.run。跟踪超时的 worker 和子进程是如何处理的;完成标准是,发生超时的测试用例将控制权返回给循环,并且下一个测试用例能够运行,同时不会让进程一直挂起。

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描述

i am making a unittest,
`for index, test_case in enumerate(test_cases[start_case_index:], start=start_case_index):
test_case_name = test_case.split("::")[-1]
print(f"Running {test_case_name}")

    pytest.main(['-v', '--tb=short', '--capture=no', '--timeout=20', '--timeout-method=signal', test_case], plugins=[recorder])
    
    result_data = recorder.results.get(test_case)
    if result_data is None:
        result_data = {
            "outcome": "not executed",
            "duration": 0,
            "timestamp": datetime.now().isoformat()
        }`

above is my test code, if one case is out of time, the process will hang and show log like below and would not break out to next test case,what shoukd I do?
++++++++++++++++++++++++++++++++++++++++++++++ Timeout ++++++++++++++++++++++++++++++++++++++++++++++

  File "/usr/lib/python3.10/threading.py", line 973, in _bootstrap
    self._bootstrap_inner()
  File "/usr/lib/python3.10/threading.py", line 1016, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.10/threading.py", line 953, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib/python3.10/concurrent/futures/thread.py", line 83, in _worker
    work_item.run()
  File "/usr/lib/python3.10/concurrent/futures/thread.py", line 58, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/workspace/bailuan/20240105_iree_chiptech/iree/tests/e2e/dlc_specific/test_runner.py", line 461, in thread_task
    result = run_test(fn, inputs, output_num, global_config_path,
  File "/workspace/bailuan/20240105_iree_chiptech/iree/tests/e2e/dlc_specific/test_runner.py", line 428, in run_test
    output_fns1 = run_in_backend("dlc")
  File "/workspace/bailuan/20240105_iree_chiptech/iree/tests/e2e/dlc_specific/test_runner.py", line 406, in run_in_backend
    run_result = subprocess.run(
  File "/usr/lib/python3.10/subprocess.py", line 505, in run
    stdout, stderr = process.communicate(input, timeout=timeout)
  File "/usr/lib/python3.10/subprocess.py", line 1154, in communicate
    stdout, stderr = self._communicate(input, endtime, timeout)
  File "/usr/lib/python3.10/subprocess.py", line 2021, in _communicate
    ready = selector.select(timeout)
  File "/usr/lib/python3.10/selectors.py", line 416, in select
    fd_event_list = self._selector.poll(timeout)
++++++++++++++++++++++++++++++++++++++++++++++ Timeout ++++++++++++++++++++++++++++++++++++++++++++++
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