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Subinterpreters hang in GIL adquisition if an extension module calls PyGILState_Ensure. #90453
Description
Activity
Reproducer:
Code for native_ext.cpp:
#define PY_SSIZE_T_CLEAN #include <Python.h> #include <assert.h> #include <pthread.h> #include <malloc.h>
#pragma GCC push_options
#pragma GCC optimize ("O0")PyObject* run_simple(PyObject*, PyObject*) { PyGILState_STATE gstate; gstate = PyGILState_Ensure(); PyGILState_Release(gstate); Py_RETURN_NONE; }
static PyMethodDef methods[] = {
{"run_simple", run_simple, METH_NOARGS, "Execute a chain of native functions"},
{NULL, NULL, 0, NULL},
};#if PY_MAJOR_VERSION >= 3 static struct PyModuleDef moduledef = {PyModuleDef_HEAD_INIT, "native_ext", "", -1, methods}; PyMODINIT_FUNC PyInit_native_ext(void) { return PyModule_Create(&moduledef); } #else PyMODINIT_FUNC initnative_ext(void) { Py_InitModule("native_ext", methods); } #endif
Code for setup.py:
import os from distutils.core import Extension from distutils.core import setup ROOT = os.path.realpath(os.path.dirname(__file__))
setup(
name="native_ext",
version="0.0",
ext_modules=[
Extension(
"native_ext",
language="c++",
sources=[os.path.join(ROOT, "native_ext.cpp")],
),
],
zip_safe=False,
)Compile extension:
python setup.py build_ext --inplace
Execute the following script:
from test.support import run_in_subinterp run_in_subinterp(""" import sys sys.path.append(".") import native_ext native_ext.run_simple() """)
The script deadlocks
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