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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"test_timerfd_initval fails with large time difference on NetBSD","articleBody":"# Bug report\n\n### Bug description:\n\nThe `test_timerfd_initval` test in `test_os.TimerfdTests` is failing on NetBSD with a very large time difference between the expected and actual expiration values. The test expects values to be almost equal within 3 decimal places, but the actual difference is over 1.7 billion seconds.\n\n### Configuration:\n```\n./configure --with-pydebug\n```\n### Test\n```\n./python -m test test_os -m test_timerfd_initval -v\n```\nOutput:\n```python\n== CPython 3.14.0a6+ (heads/main:26511993e63, Mar 15 2025, 01:30:33) [GCC 10.5.0]\n== NetBSD-10.0-amd64-x86_64-64bit-ELF little-endian\n== Python build: debug\n== cwd: /home/blue/cpython/build/test_python_worker_20567æ\n== CPU count: 16\n== encodings: locale=UTF-8 FS=utf-8\n== resources: all test resources are disabled, use -u option to unskip tests\nUsing random seed: 3011250179\n0:00:00 load avg: 2.25 Run 1 test sequentially in a single process\n0:00:00 load avg: 2.25 [1/1] test_os\ntest_timerfd_initval (test.test_os.TimerfdTests.test_timerfd_initval) ... FAIL\n======================================================================\nFAIL: test_timerfd_initval (test.test_os.TimerfdTests.test_timerfd_initval)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"/home/blue/cpython/Lib/test/test_os.py\", line 4327, in test_timerfd_initval\n    self.assertAlmostEqual(next_expiration, initial_expiration, places=self.CLOCK_RES_PLACES)\n    ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\nAssertionError: 1741991497.5326333 != 0.25 within 3 places (1741991497.2826333 difference)\n----------------------------------------------------------------------\nRan 1 test in 0.010s\nFAILED (failures=1)\ntest test_os failed\n0:00:00 load avg: 2.25 [1/1/1] test_os failed (1 failure)\n== Tests result: FAILURE ==\n1 test failed:\n    test_os\nTotal duration: 958 ms\nTotal tests: run=1 (filtered) failures=1\nTotal test files: run=1/1 (filtered) failed=1\nResult: FAILURE\n```\n\nOS: `NetBSD-10.0-amd64`\n\n### CPython versions tested on:\n\nCPython main branch, 3.14, 3.13\n\n### Operating systems tested on:\n\nOther","author":{"url":"https://github.com/furkanonder","@type":"Person","name":"furkanonder"},"datePublished":"2025-03-14T22:59:46.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/131266/cpython/issues/131266"}