为什么 asyncore 测试在编译的 Python 3.6 中失败？

Question

我编译了 Python 3.6 和 运行 测试，但其中 2 个失败了：

======================================================================
FAIL: test_handle_expt (test.test_asyncore.TestAPI_UseIPv4Poll)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/andrei/Python/cpython/Lib/test/test_asyncore.py", line 676, in test_handle_expt
    self.loop_waiting_for_flag(client)
  File "/Users/andrei/Python/cpython/Lib/test/test_asyncore.py", line 516, in loop_waiting_for_flag
    self.fail("flag not set")
AssertionError: flag not set

======================================================================
FAIL: test_handle_expt (test.test_asyncore.TestAPI_UseIPv6Poll)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/andrei/Python/cpython/Lib/test/test_asyncore.py", line 676, in test_handle_expt
    self.loop_waiting_for_flag(client)
  File "/Users/andrei/Python/cpython/Lib/test/test_asyncore.py", line 516, in loop_waiting_for_flag
    self.fail("flag not set")
AssertionError: flag not set

----------------------------------------------------------------------
Ran 101 tests in 21.140s

FAILED (failures=2, skipped=6)
test test_asyncore failed

那里会出什么问题？

Answer 1

这已在错误跟踪器上提出两次：

• Issue 28456 -- Test failures under macOS 10.12 Sierra
• Issue 28087 -- macOS 12 poll syscall returns prematurely

第一个作为第二个的欺骗而关闭，第二个尚未修复。简而言之，the poll() system function is apparently broken in Sierra。您需要等待他们完成修复。在此之前，忽略这些故障是安全的。