René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: Flaky tests with \"Python 3.11 on ubuntu-22.04 (Minimum Versions)\"","articleBody":"### Bug summary\n\nAn number of times, I've seen a set of 15 tests fail; e.g. here https://github.com/matplotlib/matplotlib/actions/runs/20340944398/job/58439839528?pr=30600\n\n```\nFAILED lib/matplotlib/tests/test_axes.py::test_pcolor_log_scale[png] - matplo...\nFAILED lib/matplotlib/tests/test_ticker.py::test_small_range_loglocator[1-lims0-ticks0]\nFAILED lib/matplotlib/tests/test_ticker.py::test_small_range_loglocator[2-lims1-ticks1]\nFAILED lib/matplotlib/tests/test_ticker.py::test_small_range_loglocator[3-lims2-ticks2]\nFAILED lib/matplotlib/tests/test_ticker.py::test_small_range_loglocator[9-lims3-ticks3]\nFAILED lib/matplotlib/tests/test_ticker.py::test_small_range_loglocator[1-lims4-ticks4]\nFAILED lib/matplotlib/tests/test_ticker.py::test_small_range_loglocator[2-lims5-ticks5]\nFAILED lib/matplotlib/tests/test_ticker.py::test_small_range_loglocator[3-lims6-ticks6]\nFAILED lib/matplotlib/tests/test_ticker.py::test_small_range_loglocator[9-lims7-ticks7]\nFAILED lib/matplotlib/tests/test_ticker.py::test_small_range_loglocator[1-lims8-ticks8]\nFAILED lib/matplotlib/tests/test_ticker.py::test_small_range_loglocator[3-lims10-ticks10]\nFAILED lib/matplotlib/tests/test_ticker.py::test_small_range_loglocator[9-lims11-ticks11]\nFAILED lib/matplotlib/tests/test_ticker.py::test_small_range_loglocator[1-lims12-ticks12]\nFAILED lib/matplotlib/tests/test_ticker.py::test_small_range_loglocator[9-lims15-ticks15]\nFAILED lib/mpl_toolkits/mplot3d/tests/test_axes3d.py::test_bar3d_notshaded[png]\n```\n\nSeems to be only in \"Python 3.11 on ubuntu-22.04 (Minimum Versions)\" - but not completely sure about that.\n\n\n### Actual outcome\n\nMost of the failing tests are an `assert_array_equal()` failing with minimal numeric tolerance.\n\n```\nE           AssertionError: \nE           Arrays are not equal\nE           \nE           Mismatched elements: 1 / 3 (33.3%)\nE           Max absolute difference: 1.38777878e-17\nE           Max relative difference: 1.38777878e-16\nE            x: array([1.e-01, 1.e+01, 1.e+03])\nE            y: array([1.e-01, 1.e+01, 1.e+03])\n```\n\n\n\n### Matplotlib Version\n\nmain\n\n","author":{"url":"https://github.com/timhoffm","@type":"Person","name":"timhoffm"},"datePublished":"2025-12-18T16:06:05.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":8},"url":"https://github.com/30882/matplotlib/issues/30882"}