https://git.ruby-lang.org/ruby.git/commit/?id=2a4049b23c

From 2a4049b23c081eb5509490bac0414ac40e83c5c4 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 3 Apr 2020 01:06:56 +0900
Subject: Bail out before pushing unexpected object


diff --git a/gc.c b/gc.c
index 1840edb..5d2801c 100644
--- a/gc.c
+++ b/gc.c
@@ -4629,6 +4629,18 @@ free_stack_chunks(mark_stack_t *stack) https://github.com/ruby/ruby/blob/trunk/gc.c#L4629
 static void
 push_mark_stack(mark_stack_t *stack, VALUE data)
 {
+    VALUE obj = data;
+    switch (BUILTIN_TYPE(obj)) {
+      case T_NIL:
+      case T_FIXNUM:
+	rb_bug("push_mark_stack() called for broken object");
+	break;
+
+      case T_NODE:
+	UNEXPECTED_NODE(push_mark_stack);
+        break;
+    }
+
     if (stack->index == stack->limit) {
         push_mark_stack_chunk(stack);
     }
-- 
cgit v0.10.2


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