./python -m venv env
./env/bin/python -m pip install wheel
./env/bin/python -m pip install cinder

$ ./env/bin/python -X dev -c 'import cinder, ctypes, sys; print(f"{len(sys.modules)=}"); ctypes.string_at(0)'
(...)
len(sys.modules)=220
Fatal Python error: Segmentation fault

Current thread 0x00007ff626de1740 (most recent call first):
  File "/home/vstinner/python/master/Lib/ctypes/__init__.py", line 517 in string_at
  File "<string>", line 1 in <module>

Extension modules: sys, builtins, _imp, _warnings, _weakref, _io, marshal, posix, faulthandler, _codecs, _signal, _abc, _stat, itertools, _operator, _collections, _functools, _sre, _locale, _heapq, _opcode, _struct, greenlet._greenlet, _thread, __original_module__thread, errno, math, __original_module_select, time, __original_module_time, _socket, select, array, _datetime, binascii, _hashlib, _blake2, _cffi_backend, _bisect, _sha512, _string, _ssl, _ctypes
Erreur de segmentation (core dumped)

$ ./env/bin/python -X dev -c 'import cinder, ctypes, sys; print(f"{len(sys.modules)=}"); ctypes.string_at(0)'
(...)
len(sys.modules)=220
Fatal Python error: Segmentation fault

Current thread 0x00007f7421252740 (most recent call first):
  File "/home/vstinner/python/master/Lib/ctypes/__init__.py", line 517 in string_at
  File "<string>", line 1 in <module>

Extension modules: greenlet._greenlet, __original_module__thread, __original_module_select, __original_module_time, _cffi_backend (total: 5)
Erreur de segmentation (core dumped)