`Py_Initialize()` still leaks in libpython3.11

Bug Report

The following code leaks several hundred kilobytes with the latest libpython from the Ubuntu APT repository:

#include <Python.h>

int main(void) {
        Py_Initialize();
        Py_Finalize();
        return 0;
}

With libpython3.10, it consistently leaks 480 KB, whereas with libpython3.11, it consistently leaks 408 KB. (These are proper IEC power-of-10 kilobytes, not power-of-2 kibibytes.) I’ve verified this by running this code as a Clang-compiled dynamic executable through Valgrind.

Binary Images

libpython3.10 version:

linux-vdso.so.1 (0x0000ffffbf695000)
libpython3.10.so.1.0 => /lib/aarch64-linux-gnu/libpython3.10.so.1.0 (0x0000ffffbf050000)
libc.so.6 => /lib/aarch64-linux-gnu/libc.so.6 (0x0000ffffbeea0000)
libexpat.so.1 => /lib/aarch64-linux-gnu/libexpat.so.1 (0x0000ffffbee60000)
libz.so.1 => /lib/aarch64-linux-gnu/libz.so.1 (0x0000ffffbee30000)
libm.so.6 => /lib/aarch64-linux-gnu/libm.so.6 (0x0000ffffbed90000)
/lib/ld-linux-aarch64.so.1 (0x0000ffffbf65c000)

libpython3.11 version:

linux-vdso.so.1 (0x0000ffffaee59000)
libpython3.11.so.1.0 => /lib/aarch64-linux-gnu/libpython3.11.so.1.0 (0x0000ffffae650000)
libc.so.6 => /lib/aarch64-linux-gnu/libc.so.6 (0x0000ffffae4a0000)
libm.so.6 => /lib/aarch64-linux-gnu/libm.so.6 (0x0000ffffae400000)
libz.so.1 => /lib/aarch64-linux-gnu/libz.so.1 (0x0000ffffae3d0000)
libexpat.so.1 => /lib/aarch64-linux-gnu/libexpat.so.1 (0x0000ffffae390000)
/lib/ld-linux-aarch64.so.1 (0x0000ffffaee20000)

Valgrind Reports

• libpython3.10.log
• libpython3.11.log

Environment

• CPython versions tested on:
  • libpython3.10
  • libpython3.11
    (Both from the Ubuntu APT repository)
• Operating system and architecture:
  • Ubuntu 22.04.1 LTS
  • AArch64
  • Virtual machine on top of Apple’s Virtualization and Hypervisor frameworks
  • macOS Ventura 13.2 (a) Beta (22D7750270d)
  • MacBook Pro with M1 Max

Comienza ejecutando el programa C independiente con Py_Initialize() y Py_Finalize() bajo Valgrind, usando las versiones de libpython3.10 y libpython3.11 de Ubuntu AArch64 descritas en el informe. Compara los informes resultantes con los logs de Valgrind enlazados para determinar el origen y el estado esperado de las asignaciones; terminado significa que la fuga está explicada y que el comportamiento se ha corregido o documentado.