1.19.6: test_checkbox and/or test_combobox lead to SIGABRT ("corrupted double-linked list")

[dvzrv]

Please provide all mandatory information!

Describe the bug (mandatory)

When trying to package 1.19.6 for Arch Linux I attempted to run the tests again.
It appears that test_checkbox() and test_combobox() both lead to SIGABRT of python/pytest after the tests are finished.
The following is printed, after the printout of the pytest result overview (example where test_checkbox() leads to the crash):

corrupted double-linked list
/startdir/PKGBUILD: line 24:  1301 Aborted                 (core dumped) pytest -vv -k "not test_pageids and not test_textbox3 and not test_combobox"

To Reproduce (mandatory)

local _site_packages=$(python -c "import site; print(site.getsitepackages()[0])")
local _test_dir="test_dir"
python -m installer --destdir="$_test_dir" dist/*.whl
export PYTHONPATH="$_test_dir/$_site_packages:$PYTHONPATH"
pytest -vv -k "not test_pageids and not test_textbox3 and not test_combobox"

Expected behavior (optional)

Tests pass and pytest/ python does not SIGABRT.

Screenshots (optional)

n/a

Your configuration (mandatory)

• Operating system, potentially version and bitness: Arch Linux (x86_64)
• Python version, bitness: 3.10.4 (x86_64)
• PyMuPDF version, installation method (wheel or generated from source): 1.19.6 (attempting to build from pypi sdist)

For example, the output of print(sys.version, "\n", sys.platform, "\n", fitz.__doc__) would be sufficient (for the first two bullets).

Additional context (optional)

I am able to ignore the two test functions (there are two others which I have issues with, but for other reasons and they do not lead to SIGABRT).

[julian-smith-artifex-com]

Would you be able to test with PyMuPDF-1.20.0 (released a couple of days ago)?

This has a fix for a potential SEGV that could be related to what you're seeing here.

[dvzrv]

Yes, this is fixed with pymupdf 1.20.0 and building against mupdf/libmupdf 1.20.0. 🎉