test_sendfile_close_peer_in_the_middle_of_receiving fails on ppc64le

Bug report

Bug description:

When running the test suite for Python 3.12 on ppc64le architecture, this test fails (it passes perfectly well on other architectures):

[ 6080s] FAIL: test_sendfile_close_peer_in_the_middle_of_receiving (test.test_asyncio.test_sendfile.EPollEventLoopTests.test_sendfile_close_peer_in_the_middle_of_receiving)
[ 6080s] ----------------------------------------------------------------------
[ 6080s] Traceback (most recent call last):
[ 6080s]   File "/home/abuild/rpmbuild/BUILD/Python-3.12.5/Lib/test/test_asyncio/test_sendfile.py", line 466, in test_sendfile_close_peer_in_the_middle_of_receiving
[ 6080s]     with self.assertRaises(ConnectionError):
[ 6080s] AssertionError: ConnectionError not raised

Complete build log

CPython versions tested on:

3.12

Operating systems tested on:

Linux

從 Lib/test/test_asyncio/test_sendfile.py 開始，特別是第 466 行的 test_sendfile_close_peer_in_the_middle_of_receiving，並以提供的 build log 作為背景資訊，在 Linux ppc64le 上重現失敗。比較測試在其他架構上的行為；完成條件是測試在 ppc64le 上能如預期可靠地引發 ConnectionError，且不會讓其他平台發生回歸。