gh-116622: Switch test_stress_delivery_simultaneous from SIGUSR1 to SIGUSR2 - #123981
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freakboy3742 merged 2 commits intoSep 12, 2024
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gh-116622: Switch test_stress_delivery_simultaneous from SIGUSR1 to SIGUSR2#123981freakboy3742 merged 2 commits into
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!buildbot iOS |
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🤖 New build scheduled with the buildbot fleet by @freakboy3742 for commit 07175ad 🤖 The command will test the builders whose names match following regular expression: iOS The builders matched are:
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Thanks @mhsmith for the PR, and @freakboy3742 for merging it 🌮🎉.. I'm working now to backport this PR to: 3.13. |
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miss-islington
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…1 to SIGUSR2 (pythonGH-123981) Use SIGUSR1 instead of SIGUSR2 to improve reliability of signal stress test on Android. (cherry picked from commit 43303e3) Co-authored-by: Malcolm Smith <smith@chaquo.com>
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GH-123988 is a backport of this pull request to the 3.13 branch. |
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On Android, test_stress_delivery_simultaneous was failing intermittently:
File "/data/user/0/org.python.testbed/files/python/lib/python3.14/test/test_signal.py", line 1340, in test_stress_delivery_simultaneous for _ in support.sleeping_retry(support.SHORT_TIMEOUT): ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^ File "/data/user/0/org.python.testbed/files/python/lib/python3.14/test/support/__init__.py", line 2509, in sleeping_retry for _ in busy_retry(timeout, err_msg, error=error): ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/data/user/0/org.python.testbed/files/python/lib/python3.14/test/support/__init__.py", line 2479, in busy_retry raise AssertionError(msg) AssertionError: timeout (30.4 seconds)When it fails, it also produces this log message:
The root cause was the same as #116423 – SIGUSR1 being consumed by a pre-existing thread that we have no control over. I looked into killing that thread, but I couldn't find a safe way of doing it (#123982). So the simplest solution is to use a different signal instead.
It looks like this problem only happens when two different signals are sent so close together that one signal arrives while the other signal's C-level handler is still running. The other tests that use SIGUSR1 don't do this, so they don't need to be changed.