tenderlove	2019-04-19 15:21:55 +0900 (Fri, 19 Apr 2019)

  New Revision: 67610

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=67610

  Log:
    Only mark the superclass if there is one
    
    Some classes don't have a superclass, so we should check to see if it's
    there before marking.

  Modified files:
    trunk/gc.c
Index: gc.c
===================================================================
--- gc.c	(revision 67609)
+++ gc.c	(revision 67610)
@@ -4757,7 +4757,9 @@ gc_mark_children(rb_objspace_t *objspace https://github.com/ruby/ruby/blob/trunk/gc.c#L4757
       case T_CLASS:
       case T_MODULE:
 	mark_m_tbl(objspace, RCLASS_M_TBL(obj));
-        gc_mark(objspace, RCLASS_SUPER((VALUE)obj));
+        if (RCLASS_SUPER((VALUE)obj)) {
+            gc_mark(objspace, RCLASS_SUPER((VALUE)obj));
+        }
 	if (!RCLASS_EXT(obj)) break;
         mark_tbl(objspace, RCLASS_IV_TBL(obj));
 	mark_const_tbl(objspace, RCLASS_CONST_TBL(obj));
@@ -4767,7 +4769,9 @@ gc_mark_children(rb_objspace_t *objspace https://github.com/ruby/ruby/blob/trunk/gc.c#L4769
 	if (FL_TEST(obj, RICLASS_IS_ORIGIN)) {
 	    mark_m_tbl(objspace, RCLASS_M_TBL(obj));
 	}
-        gc_mark(objspace, RCLASS_SUPER((VALUE)obj));
+        if (RCLASS_SUPER((VALUE)obj)) {
+            gc_mark(objspace, RCLASS_SUPER((VALUE)obj));
+        }
 	if (!RCLASS_EXT(obj)) break;
 	mark_m_tbl(objspace, RCLASS_CALLABLE_M_TBL(obj));
 	break;

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