err = PyExceptionInstance_Class(err);
if (PyExceptionClass_Check(err) && PyExceptionClass_Check(exc)) {
- int res = 0;
+ int res = 0, reclimit;
PyObject *exception, *value, *tb;
PyErr_Fetch(&exception, &value, &tb);
+ /* Temporarily bump the recursion limit, so that in the most
+ common case PyObject_IsSubclass will not raise a recursion
+ error we have to ignore anyway. */
+ reclimit = Py_GetRecursionLimit();
+ Py_SetRecursionLimit(reclimit + 5);
res = PyObject_IsSubclass(err, exc);
+ Py_SetRecursionLimit(reclimit);
/* This function must not fail, so print the error here */
if (res == -1) {
PyErr_WriteUnraisable(err);