Crash report
What happened?
Tested on the latest ubuntu:25.04 docker image.
from ctypes import Structure class MyStructure(Structure): _align_ = 0 _fields_ = []
Crashes with Floating point exception on CPython 3.13.
I'm attaching both gdb core dump and backtrace: dump.zip
Problem seems caused by _ctypes/stgdict.c:573:
aligned_size = ((size + total_align - 1) / total_align) * total_align;
Also tested on CPython 3.14, which doesn't segfaults but exits on an assert in ctypes/_layout.py:19:
assert multiple > 0
called by ctypes/_layout.py:314:
aligned_size = round_up(total_size, align)
CPython versions tested on:
3.13
Operating systems tested on:
Linux
Output from running 'python -VV' on the command line:
Python 3.13.3 (main, Apr 8 2025, 19:55:40) [GCC 14.2.0]