pyvista's tests are failing in debci on 32-bit arches (armhf and i386).

The problem appears to be triggered by vtk 9.6

The symptom is that the connectivities generated by
grid.compute_connectivity() and grid.compute_connections() have value
0, not matching the reference values.

A second observation is that the dtype is mildly discrepant (int vs
uint8 or uint32), though I don't think this would cause test error if
the values matched.

Reported upstream https://github.com/pyvista/pyvista/issues/8841
but perhaps it is a VTK issue.


e.g. on i386

$ pytest-3 -v tests/core/test_grid.py -k structured_grid_compute
==================================================================================================================== test session starts =====================================================================================================================
platform linux -- Python 3.14.6, pytest-9.1.1, pluggy-1.6.0 -- /usr/bin/python3
cachedir: .pytest_cache
hypothesis profile 'default'
Test order randomisation NOT enabled. Enable with --random-order or --random-order-bucket=<bucket_type>
required packages: cyclopts-4.17.0, matplotlib-3.10.7+dfsg1, numpy-2.4.6, pillow-12.3.0, pooch-1.9.0, scooby-0.11.0, typing-extensions-4.16.0, vtk (not found), vtk (not found), vtk (not found), vtk (not found)
optional 'colormaps' package: colorcet-3.1.0
optional 'io' packages: imageio-2.37.4, meshio-5.3.5
optional packages not found: cmcrameri, cmocean, fsspec, pyvista-zstd, ipywidgets, jupyter-server-proxy, nest-asyncio2, trame-client, trame-server, trame-vtk, trame-vtk, trame-vuetify, trame
rootdir: /home/dparsons/pyvista/python-pyvista-0.48.4
configfile: pyproject.toml
plugins: cases-3.10.1, hypothesis-6.152.4, typeguard-4.4.4, mock-3.15.1, random-order-1.2.0+ds
collected 198 items / 196 deselected / 2 selected

tests/core/test_grid.py::test_explicit_structured_grid_compute_connectivity FAILED                                                                                                                                                                     [ 50%]
tests/core/test_grid.py::test_explicit_structured_grid_compute_connections FAILED                                                                                                                                                                      [100%]

========================================================================================================================== FAILURES ==========================================================================================================================
E       assert False
E        +  where False = <function array_equal at 0xf5965ce0>(pyvista_ndarray([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,\n                 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,\n                 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,\n                 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,\n                 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,\n                 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,\n                 0, 0, 0, 0, 0, 0], dtype=uint8), array([42, 43, 43, 41, 46, 47, 47, 45, 46, 47, 47, 45, 46, 47, 47, 45, 38,\n       39, 39, 37, 58, 59, 59, 57, 62, 63, 63, 61, 62, 63, 63, 61, 62, 63,\n       63, 61, 54, 55, 55, 53, 58, 59, 59, 57, 62, 63, 63, 61, 62, 63, 63,\n       61, 62, 63, 63, 61, 54, 55, 55, 53, 58, 59, 59, 57, 62, 63, 63, 61,\n       62, 63, 63, 61, 62, 63, 63, 61, 54, 55, 55, 53, 58, 59, 59, 57, 62,\n       63, 63, 61, 62, 63, 63, 61, 62, 63, 63, 61, 54, 55, 55, 53, 26, 27,\n       27, 25, 30, 31, 31, 29, 30, 31, 31, 29, 30, 31, 31, 29, 22, 23, 23,\n       21]))
E        +    where <function array_equal at 0xf5965ce0> = np.array_equal

tests/core/test_grid.py:1806: AssertionError

E       assert False
E        +  where False = <function array_equal at 0xf5965ce0>(pyvista_ndarray([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,\n                 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,\n                 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,\n                 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,\n                 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,\n                 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,\n                 0, 0, 0, 0, 0, 0], dtype=uint32), array([3, 4, 4, 3, 4, 5, 5, 4, 4, 5, 5, 4, 4, 5, 5, 4, 3, 4, 4, 3, 4, 5,\n       5, 4, 5, 6, 6, 5, 5, 6, 6, 5, 5, 6, 6, 5, 4, 5, 5, 4, 4, 5, 5, 4,\n       5, 6, 6, 5, 5, 6, 6, 5, 5, 6, 6, 5, 4, 5, 5, 4, 4, 5, 5, 4, 5, 6,\n       6, 5, 5, 6, 6, 5, 5, 6, 6, 5, 4, 5, 5, 4, 4, 5, 5, 4, 5, 6, 6, 5,\n       5, 6, 6, 5, 5, 6, 6, 5, 4, 5, 5, 4, 3, 4, 4, 3, 4, 5, 5, 4, 4, 5,\n       5, 4, 4, 5, 5, 4, 3, 4, 4, 3]))
E        +    where <function array_equal at 0xf5965ce0> = np.array_equal

tests/core/test_grid.py:1832: AssertionError
================================================================================================================== short test summary info ===================================================================================================================
FAILED tests/core/test_grid.py::test_explicit_structured_grid_compute_connectivity - assert False
FAILED tests/core/test_grid.py::test_explicit_structured_grid_compute_connections - assert False
============================================================================================================= 2 failed, 196 deselected in 0.90s ==============================================================================================================

Hello,

Bug #1142638 in python-pyvista reported by you has been fixed in the
Git repository and is awaiting an upload. You can see the commit
message below and you can check the diff of the fix at:

https://salsa.debian.org/science-team/python-pyvista/-/commit/3ae1d13aae08677d5c2b8b02d2bb7085f82c5e9e
------------------------------------------------------------------------
add debian patch test_32bit_skip_test_explicit_structured_grid.patch

skips explicit_structured grid_compute tests,
see upstream Issue#8841
https://github.com/pyvista/pyvista/issues/8841

Closes: #1142638
------------------------------------------------------------------------

(this message was generated automatically)
-- 
Greetings

https://bugs.debian.org/1142638

We believe that the bug you reported is fixed in the latest version of
python-pyvista, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1142638@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Drew Parsons <dparsons@debian.org> (supplier of updated python-pyvista package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Tue, 28 Jul 2026 14:36:44 +0200
Source: python-pyvista
Architecture: source
Version: 0.48.4-5
Distribution: unstable
Urgency: medium
Maintainer: Debian Science Maintainers <debian-science-maintainers@lists.alioth.debian.org>
Changed-By: Drew Parsons <dparsons@debian.org>
Closes: 1142638
Changes:
 python-pyvista (0.48.4-5) unstable; urgency=medium
 .
   * debian patch test_32bit_skip_test_explicit_structured_grid.patch
     skips explicit_structured grid_compute tests, see upstream
     Issue#8841. Closes: #1142638.
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