Small fixes

src/codegen/unwinding.cpp

@@ -696,11 +696,14 @@ ExcInfo* getFrameExcInfo() {
 
     if (!copy_from_exc->type) {
         // No exceptions found:
-        *copy_from_exc = ExcInfo(None, None, NULL);
+        *copy_from_exc = ExcInfo(incref(None), incref(None), NULL);
     }
 
     for (auto* ex : to_update) {
         *ex = *copy_from_exc;
+        Py_INCREF(ex->type);
+        Py_INCREF(ex->value);
+        Py_XINCREF(ex->traceback);
     }
     assert(cur_exc);
     return cur_exc;

src/runtime/int.cpp

@@ -1395,7 +1395,7 @@ static void _addFuncIntUnknown(const char* name, ConcreteCompilerType* rtn_type,
 
 static Box* intIntGetset(Box* b, void*) {
     if (b->cls == int_cls) {
-        return b;
+        return incref(b);
     } else {
         assert(PyInt_Check(b));
         return boxInt(static_cast<BoxedInt*>(b)->n);

src/runtime/objmodel.cpp

@@ -2056,7 +2056,8 @@ Box* dataDescriptorInstanceSpecialCases(GetattrRewriteArgs* rewrite_args, BoxedS
     case BoxedMemberDescriptor::TYPE: {                                                                                \
         if (rewrite_args) {                                                                                            \
             RewriterVar* r_unboxed_val = rewrite_args->obj->getAttrCast<type, cast>(member_desc->offset);              \
-            RewriterVar* r_rtn = rewrite_args->rewriter->call(true, (void*)boxFn, r_unboxed_val);                      \
+            RewriterVar* r_rtn                                                                                         \
+                = rewrite_args->rewriter->call(true, (void*)boxFn, r_unboxed_val)->setType(RefType::OWNED);            \
             /* XXX assuming that none of these throw a capi error! */                                                  \
             rewrite_args->setReturn(r_rtn, ReturnConvention::HAS_RETURN);                                              \
         }                                                                                                              \

src/runtime/types.cpp

@@ -3443,8 +3443,10 @@ static void typeSetName(Box* b, Box* v, void*) {
     }
 
     BoxedHeapClass* ht = static_cast<BoxedHeapClass*>(type);
+    auto old_name = ht->ht_name;
     ht->ht_name = incref(s);
     ht->tp_name = s->data();
+    Py_DECREF(old_name);
 }
 
 static Box* typeBases(Box* b, void*) {

test/tests/descriptors_double.py

-# expected: reffail
 # TODO This is a hodgepodge of stuff, should probably organize it better
 # maybe merge some of it into dunder_descriptors?
 

test/tests/descriptors_getset_ics.py

-# expected: reffail
 # run_args: -n
 # statcheck: noninit_count('slowpath_getattr') <= 10
 # statcheck: noninit_count('slowpath_setattr') <= 10

test/tests/hashlib_test.py

-# expected: reffail
 import hashlib
 
 #for m in [hashlib.md5(), hashlib.sha1(), hashlib.sha256(), hashlib.sha512()]:

test/tests/traceback_test2.py

-# expected: reffail
 import sys, traceback
 
 def lumberjack():