From c9a4f8a63bef19c98771c49884ff40126e9b7b33 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Sat, 3 Jun 2017 16:35:20 +0900
Subject: Prohibit changing generational mode during GC disabled; fix #3689

---
 src/gc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/gc.c b/src/gc.c
index 031e93994..475449b2f 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -1437,7 +1437,7 @@ static void
 change_gen_gc_mode(mrb_state *mrb, mrb_gc *gc, mrb_bool enable)
 {
   if (gc->disabled || gc->iterating) {
-    gc->generational = enable;
+    mrb_raise(mrb, E_RUNTIME_ERROR, "generational mode changed when GC disabled");
     return;
   }
   if (is_generational(gc) && !enable) {
-- 
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