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[MNT]: Python 3.14: multiple RecursionErrors when running tests #29185

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befeleme opened this issue Nov 25, 2024 · 2 comments
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[MNT]: Python 3.14: multiple RecursionErrors when running tests #29185

befeleme opened this issue Nov 25, 2024 · 2 comments
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Maintenance status: duplicate

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@befeleme
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Summary

I try to build matplotlib in Fedora Linux with Python 3.14a2. The build fails, there's over 1900 tests erroring/failing because of RecursionErrors. An example traceback is copied below.

I wonder whether this has something to do with "super objects are now pickleable and copyable. (Contributed by Serhiy Storchaka in gh-125767.)"

___________________________ test_arc_pathpatch[png] ____________________________
[gw0] linux -- Python 3.14.0 /usr/bin/python3

args = ()
kwds = {'extension': 'png', 'request': <FixtureRequest for <Function test_arc_pathpatch[png]>>}

    @wraps(func)
    def inner(*args, **kwds):
        with self._recreate_cm():
>           return func(*args, **kwds)

/usr/lib64/python3.14/contextlib.py:85: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
../BUILDROOT/usr/lib64/python3.14/site-packages/matplotlib/figure.py:3395: in savefig
    self.canvas.print_figure(fname, **kwargs)
../BUILDROOT/usr/lib64/python3.14/site-packages/matplotlib/backend_bases.py:2204: in print_figure
    result = print_method(
../BUILDROOT/usr/lib64/python3.14/site-packages/matplotlib/backend_bases.py:2054: in <lambda>
    print_method = functools.wraps(meth)(lambda *args, **kwargs: meth(
../BUILDROOT/usr/lib64/python3.14/site-packages/matplotlib/backends/backend_agg.py:496: in print_png
    self._print_pil(filename_or_obj, "png", pil_kwargs, metadata)
../BUILDROOT/usr/lib64/python3.14/site-packages/matplotlib/backends/backend_agg.py:444: in _print_pil
    FigureCanvasAgg.draw(self)
../BUILDROOT/usr/lib64/python3.14/site-packages/matplotlib/backends/backend_agg.py:387: in draw
    self.figure.draw(self.renderer)
../BUILDROOT/usr/lib64/python3.14/site-packages/matplotlib/artist.py:95: in draw_wrapper
    result = draw(artist, renderer, *args, **kwargs)
../BUILDROOT/usr/lib64/python3.14/site-packages/matplotlib/artist.py:72: in draw_wrapper
    return draw(artist, renderer)
../BUILDROOT/usr/lib64/python3.14/site-packages/matplotlib/figure.py:3162: in draw
    mimage._draw_list_compositing_images(
../BUILDROOT/usr/lib64/python3.14/site-packages/matplotlib/image.py:132: in _draw_list_compositing_images
    a.draw(renderer)
../BUILDROOT/usr/lib64/python3.14/site-packages/matplotlib/artist.py:72: in draw_wrapper
    return draw(artist, renderer)
../BUILDROOT/usr/lib64/python3.14/site-packages/mpl_toolkits/mplot3d/axes3d.py:460: in draw
    axis.draw_grid(renderer)
../BUILDROOT/usr/lib64/python3.14/site-packages/matplotlib/artist.py:72: in draw_wrapper
    return draw(artist, renderer)
../BUILDROOT/usr/lib64/python3.14/site-packages/mpl_toolkits/mplot3d/axis3d.py:649: in draw_grid
    ticks = self._update_ticks()
../BUILDROOT/usr/lib64/python3.14/site-packages/matplotlib/axis.py:1301: in _update_ticks
    major_ticks = self.get_major_ticks(len(major_locs))
../BUILDROOT/usr/lib64/python3.14/site-packages/mpl_toolkits/mplot3d/axis3d.py:174: in get_major_ticks
    ticks = super().get_major_ticks(numticks)
../BUILDROOT/usr/lib64/python3.14/site-packages/matplotlib/axis.py:1663: in get_major_ticks
    self._copy_tick_props(self.majorTicks[0], tick)
../BUILDROOT/usr/lib64/python3.14/site-packages/matplotlib/axis.py:1617: in _copy_tick_props
    dest.tick1line.update_from(src.tick1line)
../BUILDROOT/usr/lib64/python3.14/site-packages/matplotlib/lines.py:1357: in update_from
    self._marker = MarkerStyle(marker=other._marker)
../BUILDROOT/usr/lib64/python3.14/site-packages/matplotlib/markers.py:248: in __init__
    self._set_marker(marker)
../BUILDROOT/usr/lib64/python3.14/site-packages/matplotlib/markers.py:323: in _set_marker
    self.__dict__ = copy.deepcopy(marker.__dict__)
/usr/lib64/python3.14/copy.py:140: in deepcopy
    y = copier(x, memo)
/usr/lib64/python3.14/copy.py:211: in _deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)
/usr/lib64/python3.14/copy.py:147: in deepcopy
    y = copier(memo)
../BUILDROOT/usr/lib64/python3.14/site-packages/matplotlib/path.py:285: in __deepcopy__
    p = copy.deepcopy(super(), memo)
/usr/lib64/python3.14/copy.py:166: in deepcopy
    y = _reconstruct(x, memo, *rv)
/usr/lib64/python3.14/copy.py:243: in _reconstruct
    y = func(*args)
/usr/lib64/python3.14/copy.py:242: in <genexpr>
    args = (deepcopy(arg, memo) for arg in args)
/usr/lib64/python3.14/copy.py:147: in deepcopy
    y = copier(memo)
E   RecursionError: maximum recursion depth exceeded
!!! Recursion detected (same locals & position)

Proposed fix

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@rcomer
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rcomer commented Nov 25, 2024

Possible duplicate of #29157

@tacaswell
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Yes, this is a duplicate of #29157 and I did indeed bisect it to python/cpython#125767

There is an upstream issue already open python/cpython#126817

@tacaswell tacaswell closed this as not planned Won't fix, can't repro, duplicate, stale Nov 25, 2024
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@tacaswell @rcomer @befeleme