test_epoll.test_control_and_wait flakes from improper poll() usage #102795
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kevinGC
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This test can fail unnecessarily. In the test we wait for events on two file descriptors. This is done in a single call to select.epoll's poll() function. However, it is valid for the OS to return only one event via poll() and the next via a subsequent call to poll(). This rarely happens, but it can cause the test to fail despite properly functioning polling. Instead, we poll a second time when necessary. Fixes python#102795.
copybara-service bot
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The test uses poll() incorrectly and flakes. Attempting to fix upstream: python/cpython#102795 PiperOrigin-RevId: 518021055
vstinner
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…2796) This test can fail unnecessarily. In the test we wait for events on two file descriptors. This is done in a single call to select.epoll's poll() function. However, it is valid for the OS to return only one event via poll() and the next via a subsequent call to poll(). This rarely happens, but it can cause the test to fail despite properly functioning polling. Instead, we poll a second time when necessary.
miss-islington
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May 4, 2023
pythonGH-102796) This test can fail unnecessarily. In the test we wait for events on two file descriptors. This is done in a single call to select.epoll's poll() function. However, it is valid for the OS to return only one event via poll() and the next via a subsequent call to poll(). This rarely happens, but it can cause the test to fail despite properly functioning polling. Instead, we poll a second time when necessary. (cherry picked from commit c9ecd3e) Co-authored-by: Kevin Krakauer <kevinGC@users.noreply.github.com>
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Bug report
test_epoll.test_control_and_wait can flake. In the test we wait for events on two file descriptors. This is done in a single call to select.epoll's poll() function. However, it is valid for the OS to return only one event via poll() and the next via a subsequent call to poll(). This rarely happens, but it can cause the test to fail despite properly functioning polling.
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