René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: Coredump when importing matplotlib.pyplot","articleBody":"### Bug summary\n\nWhen I execute `python -c 'import matplotlib.pyplot'`, python will coredump. This will occur when it is generating the `~/.cache/matplotlib/fontlist-v330.json` file, assuming that it was not already successfully generated. \r\n\r\nThe root cause of the problem is that the `/usr/share/fonts/google-noto-emoji/NotoColorEmoji.ttf` font will cause an `invalid pixel size` exception to be thrown from the FreeType library, the exception is not subsequently handled in the C++ layer, and python will abort.\n\n### Code for reproduction\n\n```python\n[ -f /usr/share/fonts/google-noto-emoji/NotoColorEmoji.ttf ] \\\r\n  \u0026\u0026 /bin/rm -f ~/.cache/matplotlib/fontlist-v330.json \\\r\n  \u0026\u0026 python -c \"import matplotlib.pyplot\"\n```\n\n\n### Actual outcome\n\n[1]    229645 abort (core dumped)  python -c\n\n### Expected outcome\n\nNo output\n\n### Additional information\n\nIt appears that this is only caused by the NotoColorEmoji font. If I update font_manager.py to skip this font, there is no issue. \r\nThis was at least working in 3.1.3. I have tried 3.4.3 and 3.6.1 and they both have the same issue. I'm using system_freetype=True in the mplsetup.py file. I have also tried compiling FreeType and this does not seem to resolve anything.\r\n\r\nThe root cause of the problem is that the `/usr/share/fonts/google-noto-emoji/NotoColorEmoji.ttf` font will cause an `invalid pixel size` exception to be thrown from the FreeType library, the exception is not subsequently handled in the C++ layer, and python will abort. \r\n\r\nI am using RedHat 7.6, 7.3 works fine because it does not have the problematic font. \r\n\r\nHere is a link to a similar issue using Pillow, [issue](https://github.com/python-pillow/Pillow/issues/6166). I'm not familiar with the code, but my understanding is that the correct solution would be the handle the FreeType exceptions in the ft2font_wrapper.cpp code and not propogate it into the Python interpreter.\r\n\r\nHere is part of the stack trace. \r\n\r\n\u003e #0  0x00007f7862cef207 in raise () from /lib64/libc.so.6\r\n\u003e #1  0x00007f7862cf08f8 in abort () from /lib64/libc.so.6\r\n\u003e #2  0x00007f784cfb2420 in _Unwind_SetGR (context=\u003coptimized out\u003e, index=\u003coptimized out\u003e, val=\u003coptimized out\u003e)\r\n\u003e     at /tmp/gcc-v9.3.0p3/gcc.source/libgcc/unwind-dw2.c:1442\r\n\u003e #3  0x00007f784cfbe797 in __gcc_personality_v0 (version=\u003coptimized out\u003e, actions=\u003coptimized out\u003e, exception_class=\u003coptimized out\u003e, ue_header=0x15d9bf0, \r\n\u003e     context=0x7fff105961e0) at /tmp/gcc-v9.3.0p3/gcc.source/libgcc/unwind-c.c:231\r\n\u003e #4  0x00007f785a69a7b3 in _Unwind_RaiseException_Phase2 () at /tmp/gcc-v9.3.0p4lnx86/gcc.source/libgcc/unwind.inc:64\r\n\u003e #5  0x00007f785a69acf1 in _Unwind_RaiseException (exc=0x15d9bf0) at /tmp/gcc-v9.3.0p4lnx86/gcc.source/libgcc/unwind.inc:136\r\n\u003e #6  0x00007f785a74a358 in __cxa_throw () from .../lib/64bit/libstdc++.so.6\r\n\u003e #7  0x00007f784cfb12a1 in **throw_ft_error**(std::__cxx11::basic_string\u003cchar, std::char_traits\u003cchar\u003e, std::allocator\u003cchar\u003e \u003e, int) [clone .cold] ()\r\n\u003e    from .../lib/python3.9/site-packages/matplotlib-3.6.1-py3.9-linux-x86_64.egg/matplotlib/ft2font.cpython-39-x86_64-linux-gnu.so\r\n\u003e #8  0x00007f784cfb9868 in **PyFT2Font_init**(PyFT2Font*, _object*, _object*) () at /tmp/gcc-v9.3.0p3/gcc.source/libgcc/unwind-dw2.c:1442\r\n\n\n### Operating system\n\nRedHat 7.6\n\n### Matplotlib Version\n\n3.6.1\n\n### Matplotlib Backend\n\nCall to getBackend also crashes (same reason as above)\n\n### Python version\n\n3.9.16\n\n### Jupyter version\n\n_No response_\n\n### Installation\n\nNone","author":{"url":"https://github.com/john-odonovan","@type":"Person","name":"john-odonovan"},"datePublished":"2023-05-05T22:53:24.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":16},"url":"https://github.com/25823/matplotlib/issues/25823"}