[Bug]: Segmentation fault when resizing on Python 3.12 and MacOS 14 #27262

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1. dopplershift commented on Nov 3, 2023

   

   dopplershift

   on Nov 3, 2023

   Last edited by dopplershift

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   Confirming that I was able to reproduce with Python 3.12 and Matplotlib 3.8.1 from conda-forge, macOS 14.1 on an M2.

   EDIT: This is using the macosx backend
2. greglucas commented on Nov 3, 2023

   

   greglucas

   on Nov 3, 2023

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   I cannot reproduce on an Intel Mac with matplotlib 3.8.1 from PyPI, so possibly just ARM related? Does 3.8.0 work as expected?
3. JRI98 commented on Nov 3, 2023

   

   JRI98

   on Nov 3, 2023

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   I cannot reproduce on an Intel Mac with matplotlib 3.8.1 from PyPI, so possibly just ARM related? Does 3.8.0 work as expected?

   Yeah I forgot to mention this happens on an M1.
   I also tried version 3.8.0 and 3.7.0, but get the same result. The bug appears to be related to the use of Python 3.12
4. ksunden commented on Nov 3, 2023

   

   ksunden

   on Nov 3, 2023

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   I can also reproduce (previously had py3.11 on that machine, so did not run into it)

   Here is the faulthandler:

   kyle@aluminum matplotlib % python -X faulthandler 
   Python 3.12.0 (main, Nov  3 2023, 10:35:24) [Clang 15.0.0 (clang-1500.0.40.1)] on darwin
   Type "help", "copyright", "credits" or "license" for more information.
   >>> import matplotlib.pyplot as plt
   >>> plt.plot([2,5,1])
   [<matplotlib.lines.Line2D object at 0x12286e1b0>]
   >>> plt.show()
   Fatal Python error: Segmentation fault
   
   Current thread 0x00000001e52b5300 (most recent call first):
     File "/Users/kyle/.pyenv/versions/edge-312/lib/python3.12/site-packages/matplotlib/backends/backend_macosx.py", line 183 in start_main_loop
     File "/Users/kyle/.pyenv/versions/edge-312/lib/python3.12/site-packages/matplotlib/backend_bases.py", line 3448 in show
     File "/Users/kyle/.pyenv/versions/edge-312/lib/python3.12/site-packages/matplotlib/pyplot.py", line 527 in show
     File "<stdin>", line 1 in <module>
   
   Extension modules: numpy.core._multiarray_umath, numpy.core._multiarray_tests, numpy.linalg._umath_linalg, numpy.fft._pocketfft_internal, numpy.random._common, numpy.random.bit_generator, numpy.random._bounded_integers, numpy.random._mt19937, numpy.random.mtrand, numpy.random._philox, numpy.random._pcg64, numpy.random._sfc64, numpy.random._generator, matplotlib._c_internal_utils, PIL._imaging, matplotlib._path, kiwisolver._cext, matplotlib._image, matplotlib.backends._macosx (total: 19)

   Can also confirm that it seems specific to the macosx backend (e.g. qt does not segfault)

   No surprise, but the innermost python call identified by the faulthandler traceback is a line calling into the obj-C extension module:

   matplotlib/lib/matplotlib/backends/backend_macosx.py

   Line 183 in fac632f

   _macosx.show()

   Edit: Python compiled from source via pyenv, so not specific to conda.
5. oscargus

   added

   GUI: MacOSX

   on Nov 3, 2023
6. tacaswell commented on Nov 6, 2023

   

   tacaswell

   on Nov 6, 2023

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   This suggests that the issues is with our extension module and have been bit by the c-level changes in upstream.
7. ksunden commented on Nov 8, 2023

   

   ksunden

   on Nov 8, 2023

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   Bisects to python/cpython@df3173d (python/cpython#101660)

   That commit changed memory allocation behavior, though not immediately obvious to me what we are doing wrong (if anything).

   The stated intent of the change is to enable per-subinterpretter GIL, though we do not (intentionally) use that feature (though the commit message does indicate value outside of that, and also states that the errors are indicative of problems down the line).
8. QuLogic

   added this to the v3.8.2 milestone on Nov 8, 2023
9. tacaswell

   closed this as completedin #27290on Nov 9, 2023
10. QuLogic

    modified the milestones: v3.8.2, v3.7.4 on Nov 15, 2023