mark `cc->cme_` if it is for `super`

`vm_search_super_method()` makes orphan CCs (they are not connected
from ccs) and `cc->cme_` can be collected before without marking.

1 files changed, 8 insertions, 0 deletions

diff --git a/gc.c b/gc.c
index 54582bd81a..916e08eb03 100644
--- a/gc.c
+++ b/gc.c
@@ -7030,7 +7030,15 @@ gc_mark_imemo(rb_objspace_t *objspace, VALUE obj)
          * - On the multi-Ractors, cme will be collected with global GC
          *   so that it is safe if GC is not interleaving while accessing
          *   cc and cme.
+         * - However, cc_type_super is not chained from cc so the cc->cme
+         *   should be marked.
          */
+        {
+            const struct rb_callcache *cc = (const struct rb_callcache *)obj;
+            if (vm_cc_super_p(cc)) {
+                gc_mark(objspace, (VALUE)cc->cme_);
+            }
+        }
         return;
       case imemo_constcache:
         {