I don't think this has been really fixed, see attached log,even with the patch applied I am still getting:

[ 6220s] ======================================================================
[ 6220s] FAIL: test_pyobject_freed_is_freed (test.test_capi.PyMemMallocDebugTests)
[ 6220s] ----------------------------------------------------------------------
[ 6220s] Traceback (most recent call last):
[ 6220s]   File "/home/abuild/rpmbuild/BUILD/Python-3.8.0b1/Lib/test/test_capi.py", line 730, i
n test_pyobject_freed_is_freed
[ 6220s]     self.check_pyobject_is_freed('check_pyobject_freed_is_freed')
[ 6220s]   File "/home/abuild/rpmbuild/BUILD/Python-3.8.0b1/Lib/test/test_capi.py", line 721, i
n check_pyobject_is_freed
[ 6220s]     assert_python_ok('-c', code, PYTHONMALLOC=self.PYTHONMALLOC)
[ 6220s]   File "/home/abuild/rpmbuild/BUILD/Python-3.8.0b1/Lib/test/support/script_helper.py",
 line 157, in assert_python_ok
[ 6220s]     return _assert_python(True, *args, **env_vars)
[ 6220s]   File "/home/abuild/rpmbuild/BUILD/Python-3.8.0b1/Lib/test/support/script_helper.py",
 line 143, in _assert_python
[ 6220s]     res.fail(cmd_line)
[ 6220s]   File "/home/abuild/rpmbuild/BUILD/Python-3.8.0b1/Lib/test/support/script_helper.py", line 70, in fail
[ 6220s]     raise AssertionError("Process return code is %d\n"
[ 6220s] AssertionError: Process return code is 1
[ 6220s] command line: ['/home/abuild/rpmbuild/BUILD/Python-3.8.0b1/python', '-X', 'faulthandler', '-c', '\nimport gc, os, sys, _testcapi\n# Disable the GC to avoid crash on GC collection\ngc.disable()\ntry:\n    _testcapi.check_pyobject_freed_is_freed()\n    # Exit immediately to avoid a crash while deallocating\n    # the invalid object\n    os._exit(0)\nexcept _testcapi.error:\n    os._exit(1)\n']