似乎没有捕获到引发的异常

Question

我使用futures.ProcessPoolExecutor(max_workers=4)运行一个应用程序。在linux上，它运行良好。在两个不同的macOS上，它会冻结/锁定/我们不知道。当我们在macos上按CTRL + C时，将显示以下堆栈跟踪。

Traceback (most recent call last):
Traceback (most recent call last):
Traceback (most recent call last):
Traceback (most recent call last):
  File "tests/parallel/recorder_tool.py", line 168, in __enter__
  File "tests/parallel/recorder_tool.py", line 168, in __enter__
  File "tests/parallel/recorder_tool.py", line 168, in __enter__
  File "tests/parallel/recorder_tool.py", line 168, in __enter__
    self.manager = self.__class__.managers.pop()
    self.manager = self.__class__.managers.pop()
    self.manager = self.__class__.managers.pop()
IndexError: pop from empty list
IndexError: pop from empty list

During handling of the above exception, another exception occurred:

    self.manager = self.__class__.managers.pop()
IndexError: pop from empty list

During handling of the above exception, another exception occurred:

KeyboardInterrupt

During handling of the above exception, another exception occurred:

KeyboardInterrupt
IndexError: pop from empty list
KeyboardInterrupt
Exception ignored in: 'grpc._cython.cygrpc._next'
...

这是与IndexError相关的代码示例。

try:                                            
    self.manager = self.__class__.managers.pop()
except IndexError:                              
    self.manager = Factory.get_manager(get_conn)

有一个except IndexError块，但是堆栈跟踪使它看起来好像从未到达过。我是否应该在这里进行一些研究，或者仅仅是因为按下了Ctrl + C就没有更多的异常处理程序了？另外，是否有任何明显的原因可以在Linux而不是macOS上运行？

谢谢！

Answer 1

您的IndexError被捕获。解开交错的堆栈轨迹后，似乎在处理IndexError时KeyboardInterrupt到达了（在每个进程中）。以下行：

During handling of the above exception, another exception occurred:

表示implicit exception chaining。处理现有异常时发生了新的异常，因此将这两个异常附加在一起，并打印了两个堆栈跟踪。