[Bug]: Flaky tests with "Python 3.11 on ubuntu-22.04 (Minimum Versions)" #30882
Description
Bug summary
An 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
FAILED lib/matplotlib/tests/test_axes.py::test_pcolor_log_scale[png] - matplo...
FAILED lib/matplotlib/tests/test_ticker.py::test_small_range_loglocator[1-lims0-ticks0]
FAILED lib/matplotlib/tests/test_ticker.py::test_small_range_loglocator[2-lims1-ticks1]
FAILED lib/matplotlib/tests/test_ticker.py::test_small_range_loglocator[3-lims2-ticks2]
FAILED lib/matplotlib/tests/test_ticker.py::test_small_range_loglocator[9-lims3-ticks3]
FAILED lib/matplotlib/tests/test_ticker.py::test_small_range_loglocator[1-lims4-ticks4]
FAILED lib/matplotlib/tests/test_ticker.py::test_small_range_loglocator[2-lims5-ticks5]
FAILED lib/matplotlib/tests/test_ticker.py::test_small_range_loglocator[3-lims6-ticks6]
FAILED lib/matplotlib/tests/test_ticker.py::test_small_range_loglocator[9-lims7-ticks7]
FAILED lib/matplotlib/tests/test_ticker.py::test_small_range_loglocator[1-lims8-ticks8]
FAILED lib/matplotlib/tests/test_ticker.py::test_small_range_loglocator[3-lims10-ticks10]
FAILED lib/matplotlib/tests/test_ticker.py::test_small_range_loglocator[9-lims11-ticks11]
FAILED lib/matplotlib/tests/test_ticker.py::test_small_range_loglocator[1-lims12-ticks12]
FAILED lib/matplotlib/tests/test_ticker.py::test_small_range_loglocator[9-lims15-ticks15]
FAILED lib/mpl_toolkits/mplot3d/tests/test_axes3d.py::test_bar3d_notshaded[png]
Seems to be only in "Python 3.11 on ubuntu-22.04 (Minimum Versions)" - but not completely sure about that.
Actual outcome
Most of the failing tests are an assert_array_equal() failing with minimal numeric tolerance.
E AssertionError:
E Arrays are not equal
E
E Mismatched elements: 1 / 3 (33.3%)
E Max absolute difference: 1.38777878e-17
E Max relative difference: 1.38777878e-16
E x: array([1.e-01, 1.e+01, 1.e+03])
E y: array([1.e-01, 1.e+01, 1.e+03])
Matplotlib Version
main