Variious tests fail on x86 (32-bit issues)? #10956
Description
What happened?
FAILED xarray/tests/test_formatting.py::TestFormatting::test_diff_datatree_repr_equals - assert "Left and right DataTree objects are not equal\n\nData at node 'node' does not match:\n Differing dimensions:\n (y: 2) != (x: 1, y: 2)\n Differing data variables:\n L data (y) i...
FAILED xarray/tests/test_formatting.py::test_repr_pandas_multi_index - assert "<xarray.DataArray 'x' (x: 4)> Size: 16B\n[4 values with dtype=object]\nCoordinates:\n * x (x) object 16B MultiIndex\n * foo (x) object 16B 'a' 'a' 'b' 'b'\n * bar (x) int64 32B 1...
FAILED xarray/tests/test_coding_times.py::test_decode_timedelta_via_units[decode_timedelta=False] - AssertionError: assert dtype('int32') == dtype('int64')
FAILED xarray/tests/test_variable.py::TestVariable::test_reduce_keepdims - AssertionError: Left and right Variable objects are not identical
FAILED xarray/tests/test_groupby.py::test_groupby_reduce_dimension_error - AssertionError: Left and right DataArray objects are not identical
FAILED xarray/tests/test_groupby.py::TestDataArrayGroupBy::test_groupby_reduce_keep_attrs[None-True] - AssertionError: Left and right DataArray objects are not identical
FAILED xarray/tests/test_groupby.py::TestDataArrayGroupBy::test_groupby_reduce_keep_attrs[None-False] - AssertionError: Left and right DataArray objects are not identical
FAILED xarray/tests/test_groupby.py::TestDataArrayGroupBy::test_groupby_reduce_keep_attrs[True-True] - AssertionError: Left and right DataArray objects are not identical
FAILED xarray/tests/test_groupby.py::TestDataArrayGroupBy::test_groupby_reduce_keep_attrs[True-False] - AssertionError: Left and right DataArray objects are not identical
FAILED xarray/tests/test_groupby.py::TestDataArrayGroupBy::test_groupby_reduce_keep_attrs[False-True] - AssertionError: Left and right DataArray objects are not identical
FAILED xarray/tests/test_groupby.py::TestDataArrayGroupBy::test_groupby_reduce_keep_attrs[False-False] - AssertionError: Left and right DataArray objects are not identical
FAILED xarray/tests/test_namedarray.py::test_fake_target_chunksize[input_array0-1024-int64] - AssertionError: assert dtype('int32') == <class 'numpy.int64'>
FAILED xarray/tests/test_namedarray.py::test_fake_target_chunksize_cftime - assert 146 == 73
FAILED xarray/tests/test_dataset.py::TestDataset::test_to_and_from_dataframe - assert False
FAILED xarray/tests/test_strategies.py::TestReduction::test_mean - AssertionError:
========================================================= 15 failed, 12970 passed, 6493 skipped, 26 xfailed, 9 xpassed, 12 warnings in 178.95s (0:02:58) ==========================================================
* ERROR: dev-python/xarray-2025.11.0::gentoo failed (test phase):
* pytest failed with python3.13
Seems to be bad hardcoded assumptions? Tests all pass on amd64.
Verbose log: xarray-2025.11.0:20251128-074341.log
Steps to reproduce
In an x86 Gentoo container:
emerge --onlydeps --with-test-deps dev-python/xarray
FEATURES=test emerge dev-python/xarray
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.
Environment
INSTALLED VERSIONS
commit: None
python: 3.13.5 (main, Nov 28 2025, 05:01:36) [GCC 14.3.1 20250801]
python-bits: 32
OS: Linux
OS-release: 6.17.3-gentoo-dist
machine: i686
processor: AMD EPYC 7543 32-Core Processor
byteorder: little
LC_ALL: None
LANG: C.UTF-8
LOCALE: ('C', 'UTF-8')
libhdf5: 1.14.6
libnetcdf: None
xarray: 2025.11.0
pandas: 2.3.1
numpy: 2.3.2
scipy: 1.16.2
netCDF4: None
pydap: None
h5netcdf: None
h5py: 3.15.1
zarr: None
cftime: 1.6.5
nc_time_axis: None
iris: None
bottleneck: 1.6.0
dask: None
distributed: None
matplotlib: 3.10.3
cartopy: None
seaborn: None
numbagg: None
fsspec: None
cupy: None
pint: None
sparse: None
flox: None
numpy_groupies: None
setuptools: 80.9.0
pip: 25.3
conda: None
pytest: 8.4.2
mypy: None
IPython: None
sphinx: None