101 static PyObject*
102 get_disk_partitions(PyObject* self, PyObject* args)
103 {
104     FILE *file;
105     struct mntent *entry;
106     PyObject* py_retlist = PyList_New(0);
when PyList_New() succeeds
PyListObject allocated at:     PyObject* py_retlist = PyList_New(0);
ob_refcnt is now refs: 1 + N where N >= 0
107     PyObject* py_tuple;
108 
109     // MOUNTED constant comes from mntent.h and it's == '/etc/mtab'
110     Py_BEGIN_ALLOW_THREADS
releasing the GIL by calling PyEval_SaveThread()
111     file = setmntent(MOUNTED, "r");
112     Py_END_ALLOW_THREADS
reacquiring the GIL by calling PyEval_RestoreThread()
113     if ((file == 0) || (file == NULL)) {
when treating unknown struct FILE * from psutil/_psutil_linux.c:111 as NULL
taking True path
114         return PyErr_SetFromErrno(PyExc_OSError);
PyErr_SetFromErrno()
115     }
116 
117     while ((entry = getmntent(file))) {
118         if (entry == NULL) {
119             endmntent(file);
120             return PyErr_Format(PyExc_RuntimeError, "getmntent() failed");
121         }
122         py_tuple = Py_BuildValue("(sss)", entry->mnt_fsname,  // device
123                                           entry->mnt_dir,     // mount point
124                                           entry->mnt_type);   // fs type
125         PyList_Append(py_retlist, py_tuple);
126         Py_XDECREF(py_tuple);
127     }
128 
129     endmntent(file);
130     return py_retlist;
131 }
ob_refcnt of '*py_retlist' is 1 too high
was expecting final ob_refcnt to be N + 0 (for some unknown N)
but final ob_refcnt is N + 1

101 static PyObject*
102 get_disk_partitions(PyObject* self, PyObject* args)
103 {
104     FILE *file;
105     struct mntent *entry;
106     PyObject* py_retlist = PyList_New(0);
when PyList_New() fails
107     PyObject* py_tuple;
108 
109     // MOUNTED constant comes from mntent.h and it's == '/etc/mtab'
110     Py_BEGIN_ALLOW_THREADS
releasing the GIL by calling PyEval_SaveThread()
111     file = setmntent(MOUNTED, "r");
112     Py_END_ALLOW_THREADS
reacquiring the GIL by calling PyEval_RestoreThread()
113     if ((file == 0) || (file == NULL)) {
when treating unknown struct FILE * from psutil/_psutil_linux.c:111 as non-NULL
taking False path
114         return PyErr_SetFromErrno(PyExc_OSError);
115     }
116 
117     while ((entry = getmntent(file))) {
when treating unknown struct mntent * from psutil/_psutil_linux.c:117 as non-NULL
taking True path
118         if (entry == NULL) {
taking False path
119             endmntent(file);
120             return PyErr_Format(PyExc_RuntimeError, "getmntent() failed");
121         }
122         py_tuple = Py_BuildValue("(sss)", entry->mnt_fsname,  // device
when Py_BuildValue() succeeds
123                                           entry->mnt_dir,     // mount point
124                                           entry->mnt_type);   // fs type
125         PyList_Append(py_retlist, py_tuple);
calling PyList_Append with NULL as argument 1 (py_retlist) at psutil/_psutil_linux.c:125
PyList_Append() invokes Py_TYPE() on the pointer via the PyList_Check() macro, thus accessing (NULL)->ob_type
found 1 similar trace(s) to this
126         Py_XDECREF(py_tuple);
127     }
128 
129     endmntent(file);
130     return py_retlist;
131 }