Test failure on RISC-V platform

[U2FsdGVkX1]

What happened?

I am a Fedora packager
When I run pytest on the RISC-V platform, I got four failures

What did you expect to happen?

No response

Minimal Complete Verifiable Example

pytest xarray/tests/test_backends.py::TestNetCDF4ViaDaskData::test_roundtrip_mask_and_scale
pytest xarray/tests/test_backends.py::TestNetCDF4Data::test_roundtrip_mask_and_scale

MVCE confirmation

• Minimal example — the example is as focused as reasonably possible to demonstrate the underlying issue in xarray.
• Complete example — the example is self-contained, including all data and the text of any traceback.
• Verifiable example — the example copy & pastes into an IPython prompt or Binder notebook, returning the result.
• New issue — a search of GitHub Issues suggests this is not a duplicate.
• Recent environment — the issue occurs with the latest version of xarray and its dependencies.

Relevant log output

XFAIL tests/test_units.py::TestDataArray::test_searchsorted[int64-function_searchsorted-identical_unit] - xarray does not implement __array_function__
XFAIL tests/test_units.py::TestDataArray::test_missing_value_filling[int64-method_bfill] - ffill and bfill lose units in data
XFAIL tests/test_units.py::TestPlots::test_units_in_slice_line_plot_labels_isel[coord_unit1-coord_attrs1] - pint.errors.UnitStrippedWarning
XFAIL tests/test_units.py::TestPlots::test_units_in_line_plot_labels[coord_unit1-coord_attrs1] - indexes don't support units
XFAIL tests/test_variable.py::TestVariableWithDask::test_pad[xr_arg2-np_arg2-median] - median is not implemented by Dask
XFAIL tests/test_units.py::TestDataset::test_missing_value_filling[int64-method_bfill] - ffill and bfill lose the unit
XFAIL tests/test_variable.py::TestVariableWithDask::test_pad[xr_arg0-np_arg0-median] - median is not implemented by Dask
XFAIL tests/test_units.py::TestDataArray::test_interp_reindex_like[int64-method_interp_like-data] - uses scipy
XFAIL tests/test_variable.py::TestVariableWithDask::test_pad[xr_arg2-np_arg2-reflect] - dask.array.pad bug
XFAIL tests/test_units.py::TestDataset::test_interp_reindex_like[float64-method_interp_like-coords] - uses scipy
XFAIL tests/test_variable.py::TestVariableWithDask::test_pad[xr_arg3-np_arg3-median] - median is not implemented by Dask
XFAIL tests/test_variable.py::TestVariableWithDask::test_pad[xr_arg4-np_arg4-median] - median is not implemented by Dask
XFAIL tests/test_units.py::TestDataArray::test_numpy_methods_with_args[float64-no_unit-function_clip] - xarray does not implement __array_function__
XFAIL tests/test_units.py::TestDataset::test_interp_reindex[int64-method_interp-data] - uses scipy
XFAIL tests/test_variable.py::TestVariableWithDask::test_pad[xr_arg3-np_arg3-reflect] - dask.array.pad bug
XFAIL tests/test_units.py::TestDataArray::test_interp_reindex_like[int64-method_interp_like-coords] - uses scipy
XFAIL tests/test_units.py::TestDataset::test_interp_reindex_like[int64-method_interp_like-data] - uses scipy
XFAIL tests/test_units.py::TestDataset::test_interp_reindex[int64-method_interp-coords] - uses scipy
XFAIL tests/test_units.py::TestDataset::test_interp_reindex_like[int64-method_interp_like-coords] - uses scipy
XPASS tests/test_computation.py::test_cross[a6-b6-ae6-be6-cartesian--1-False]
XPASS tests/test_dataarray.py::TestDataArray::test_copy_coords[True-expected_orig0]
XPASS tests/test_dataarray.py::TestDataArray::test_to_dask_dataframe - dask-expr is broken
XPASS tests/test_dataset.py::TestDataset::test_copy_coords[True-expected_orig0]
XPASS tests/test_computation.py::test_cross[a5-b5-ae5-be5-cartesian--1-False]
XPASS tests/test_plot.py::TestImshow::test_dates_are_concise - Failing inside matplotlib. Should probably be fixed upstream because other plot functions can handle it. Remove this test when it works, already in Common2dMixin
XPASS tests/test_units.py::TestVariable::test_computation[int64-method_rolling_window-numbagg] - converts to ndarray
XPASS tests/test_units.py::TestVariable::test_computation[int64-method_rolling_window-None] - converts to ndarray
XPASS tests/test_units.py::TestVariable::test_computation[float64-method_rolling_window-numbagg] - converts to ndarray
XPASS tests/test_units.py::TestVariable::test_computation[float64-method_rolling_window-None] - converts to ndarray
XPASS tests/test_units.py::TestDataset::test_computation_objects[float64-coords-method_rolling] - strips units
XPASS tests/test_units.py::TestDataset::test_computation_objects[int64-coords-method_rolling] - strips units
XPASS tests/test_variable.py::TestVariableWithDask::test_pad[xr_arg0-np_arg0-reflect] - dask.array.pad bug
XPASS tests/test_variable.py::TestVariableWithDask::test_pad[xr_arg1-np_arg1-reflect] - dask.array.pad bug
FAILED tests/test_backends.py::TestNetCDF4ViaDaskData::test_roundtrip_mask_and_scale[dtype0-create_unsigned_false_masked_scaled_data-create_encoded_unsigned_false_masked_scaled_data]
FAILED tests/test_backends.py::TestNetCDF4Data::test_roundtrip_mask_and_scale[dtype0-create_unsigned_false_masked_scaled_data-create_encoded_unsigned_false_masked_scaled_data]
FAILED tests/test_backends.py::TestNetCDF4ViaDaskData::test_roundtrip_mask_and_scale[dtype1-create_unsigned_false_masked_scaled_data-create_encoded_unsigned_false_masked_scaled_data]
FAILED tests/test_backends.py::TestNetCDF4Data::test_roundtrip_mask_and_scale[dtype1-create_unsigned_false_masked_scaled_data-create_encoded_unsigned_false_masked_scaled_data]

Anything else we need to know?

TestNetCDF4ViaDaskData::test_roundtrip_mask_and_scale

TestNetCDF4Data::test_roundtrip_mask_and_scale

Environment

commit: 1bb867d
python: 3.13.0 (main, Oct 8 2024, 00:00:00) [GCC 14.2.1 20240912 (Red Hat 14.2.1-3)]
python-bits: 64
OS: Linux
OS-release: 6.1.55
machine: riscv64
processor:
byteorder: little
LC_ALL: None
LANG: C.UTF-8
LOCALE: ('C', 'UTF-8')
libhdf5: 1.12.1
libnetcdf: 4.9.2

xarray: 2024.11.0
pandas: 2.2.1
numpy: 1.26.4
scipy: 1.11.3
netCDF4: 1.7.1
pydap: None
h5netcdf: None
h5py: None
zarr: 2.18.3
cftime: 1.6.4
nc_time_axis: None
iris: None
bottleneck: 1.3.7
dask: 2024.9.1
distributed: None
matplotlib: 3.9.1
cartopy: None
seaborn: 0.13.2
numbagg: None
fsspec: 2024.3.1
cupy: None
pint: 0.24.4
sparse: None
flox: None
numpy_groupies: None
setuptools: 69.2.0
pip: 24.2
conda: None
pytest: 8.3.3
mypy: None
IPython: None
sphinx: 7.3.7

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