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gh-116622: Switch test_stress_delivery_simultaneous from SIGUSR1 to SIGUSR2#123981

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freakboy3742 merged 2 commits intopython:mainfrommhsmith:android-sigusr1
Sep 12, 2024

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mhsmith
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@mhsmithmhsmith commentedSep 11, 2024•
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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:

Thread[6,tid=29634,WaitingInMainSignalCatcherLoop,Thread*=0xb400007e782136f0,peer=0x12cc0578,"Signal Catcher"]: reacting to signal 10

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.

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!buildbot iOS

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🤖 New build scheduled with the buildbot fleet by@freakboy3742 for commit07175ad 🤖

The command will test the builders whose names match following regular expression:iOS

The builders matched are:

  • iOS ARM64 Simulator PR

@freakboy3742freakboy3742 merged commit43303e3 intopython:mainSep 12, 2024
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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.
🐍🍒⛏🤖

miss-islington pushed a commit to miss-islington/cpython that referenced this pull requestSep 12, 2024
…1 to SIGUSR2 (pythonGH-123981)Use SIGUSR1 instead of SIGUSR2 to improve reliability of signal stress test on Android.(cherry picked from commit43303e3)Co-authored-by: Malcolm Smith <smith@chaquo.com>
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GH-123988 is a backport of this pull request to the3.13 branch.

@bedevere-appbedevere-appbot removed the needs backport to 3.13bugs and security fixes labelSep 12, 2024
Yhg1s pushed a commit that referenced this pull requestSep 24, 2024
…R1 to SIGUSR2 (GH-123981) (#123988)gh-116622: Switch test_stress_delivery_simultaneous from SIGUSR1 to SIGUSR2 (GH-123981)Use SIGUSR1 instead of SIGUSR2 to improve reliability of signal stress test on Android.(cherry picked from commit43303e3)Co-authored-by: Malcolm Smith <smith@chaquo.com>
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