Mixing py::bind and PyModule_AddObject

[jojobugfree]

I created a module using py::module. Based on this, can I get the PyObject* of this module and then call PyModule_AddObject to create a new type?
The code looks like:

typedef struct {
    PyObject_HEAD
    /* Type-specific fields go here. */
} CustomObject;

static PyTypeObject CustomType = {
    .ob_base = PyVarObject_HEAD_INIT(NULL, 0)
    .tp_name = "custom.Custom",
    .tp_doc = PyDoc_STR("Custom objects"),
    .tp_basicsize = sizeof(CustomObject),
    .tp_itemsize = 0,
    .tp_flags = Py_TPFLAGS_DEFAULT,
    .tp_new = PyType_GenericNew,
};

void Reg(const py::module *m) {
  Py_INCREF(&CustomType);
  if (PyModule_AddObject(m->ptr(), "Custom", (PyObject *) &CustomType) < 0) {
    Py_DECREF(&CustomType);
  }
}

[jojobugfree]

I got a "Segmentation fault"

Thread 1 "python" received signal SIGSEGV, Segmentation fault.
_PyObject_IS_GC (obj=0xfffeaa5c5ff8) at /usr/local/src/conda/python-3.9.19/Include/internal/pycore_object.h:112
112     /usr/local/src/conda/python-3.9.19/Include/internal/pycore_object.h: No such file or directory.
(gdb) bt
#0  _PyObject_IS_GC (obj=0xfffeaa5c5ff8) at /usr/local/src/conda/python-3.9.19/Include/internal/pycore_object.h:112
#1  visit_decref (parent=<optimized out>, op=0xfffeaa5c5ff8) at /usr/local/src/conda/python-3.9.19/Modules/gcmodule.c:443
#2  dict_traverse (op=0xfffe5e740b00, visit=<optimized out>, arg=<optimized out>) at /usr/local/src/conda/python-3.9.19/Objects/dictobject.c:3148
#3  0x000000000047ad80 in subtract_refs (containers=<optimized out>) at /usr/local/src/conda/python-3.9.19/Modules/gcmodule.c:469
#4  deduce_unreachable (base=base@entry=0x7674a0, unreachable=unreachable@entry=0xffffffffa3f0) at /usr/local/src/conda/python-3.9.19/Modules/gcmodule.c:1092
#5  0x0000000000479978 in collect (tstate=tstate@entry=0x769040, generation=generation@entry=0, n_collected=n_collected@entry=0xffffffffa4b0,
    n_uncollectable=n_uncollectable@entry=0xffffffffa4a8, nofail=nofail@entry=0) at /usr/local/src/conda/python-3.9.19/Modules/gcmodule.c:1207
#6  0x000000000054f1bc in collect_with_callback (tstate=tstate@entry=0x769040, generation=0) at /usr/local/src/conda/python-3.9.19/Modules/gcmodule.c:1387
#7  0x000000000046ef88 in collect_generations (tstate=0x769040) at /usr/local/src/conda/python-3.9.19/Modules/gcmodule.c:2269
#8  _PyObject_GC_Alloc (basicsize=<optimized out>, use_calloc=0) at /usr/local/src/conda/python-3.9.19/Modules/gcmodule.c:2284
#9  _PyObject_GC_Malloc (basicsize=<optimized out>) at /usr/local/src/conda/python-3.9.19/Modules/gcmodule.c:2294
#10 _PyObject_GC_New (tp=tp@entry=0x70d830 <PyDict_Type>) at /usr/local/src/conda/python-3.9.19/Modules/gcmodule.c:2306
#11 0x0000000000470ef8 in new_dict (values=0x7429f0 <empty_values>, keys=0x714e40 <empty_keys_struct>) at /usr/local/src/conda/python-3.9.19/Objects/dictobject.c:628
#12 PyDict_New () at /usr/local/src/conda/python-3.9.19/Objects/dictobject.c:723
#13 0x0000000000581500 in ste_new (col_offset=4, lineno=1514, key=0xfffe5e64e7b0, block=FunctionBlock, name=0xffffeaf2e7f0, st=0xfffe5e64e7b0)
    at /usr/local/src/conda/python-3.9.19/Python/symtable.c:96
#14 symtable_enter_block (st=st@entry=0xfffe5e64e7b0, name=0xffffeaf2e7f0, block=block@entry=FunctionBlock, ast=ast@entry=0xf357668, lineno=1514, col_offset=4)
    at /usr/local/src/conda/python-3.9.19/Python/symtable.c:973
#15 0x00000000004fb274 in symtable_visit_stmt (st=st@entry=0xfffe5e64e7b0, s=0xf357668) at /usr/local/src/conda/python-3.9.19/Python/symtable.c:1191
#16 0x00000000004fb904 in symtable_visit_stmt (st=st@entry=0xfffe5e64e7b0, s=<optimized out>) at /usr/local/src/conda/python-3.9.19/Python/symtable.c:1213
#17 0x0000000000580830 in PySymtable_BuildObject (mod=mod@entry=0xf3d7050, filename=filename@entry=0xfffeaa739180, future=<optimized out>)
    at /usr/local/src/conda/python-3.9.19/Python/symtable.c:305
#18 0x000000000057f6f0 in PyAST_CompileObject (mod=0xf3d7050, filename=filename@entry=0xfffeaa739180, flags=flags@entry=0xffffffffa830, optimize=optimize@entry=-1,
    arena=arena@entry=0xfffe5e78ae30) at /usr/local/src/conda/python-3.9.19/Python/compile.c:363
#19 0x000000000056a960 in Py_CompileStringObject (
    str=0xf13a2b0 "# This is the Python adaptation and derivative work of Myia (https://github.com/mila-iqia/myia/).\n#\n# Copyright 2020-2024 Huawei Technologies Co., Ltd\n#\n# Licensed under the Apache License, Version 2."..., filename=filename@entry=0xfffeaa739180, start=257, flags=flags@entry=0xffffffffa830,
    optimize=optimize@entry=-1) at /usr/local/src/conda/python-3.9.19/Python/pythonrun.c:1316
#20 0x0000000000565cf0 in builtin_compile_impl (module=<optimized out>, feature_version=<optimized out>, optimize=-1, dont_inherit=1, flags=0, mode=<optimized out>,
    filename=0xfffeaa739180, source=0xf13a290) at /usr/local/src/conda/python-3.9.19/Python/Python-ast.c:10851