ObjectSpace._id2ref should check liveness.

objspace->id_to_obj_tbl can contain died objects because of lazy
sweep, so that it should check liveness.

1 files changed, 2 insertions, 1 deletions

diff --git a/gc.c b/gc.c
index ab7662b534..f6e75e8c78 100644
--- a/gc.c
+++ b/gc.c
@@ -3644,7 +3644,8 @@ id2ref(VALUE objid)
         }
     }
 
-    if (st_lookup(objspace->id_to_obj_tbl, objid, &orig)) {
+    if (st_lookup(objspace->id_to_obj_tbl, objid, &orig) &&
+        is_live_object(objspace, orig)) {
         return orig;
     }