From e8a4e4262a425d9e5e8e19c40bf987d491f73053 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Wed, 21 Jun 2017 17:59:14 +0900
Subject: Add write barrier to protect proc reference from fiber; fix #3719

---
 mrbgems/mruby-fiber/src/fiber.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mrbgems/mruby-fiber/src/fiber.c b/mrbgems/mruby-fiber/src/fiber.c
index 8a6146dbe..0a6d92f67 100644
--- a/mrbgems/mruby-fiber/src/fiber.c
+++ b/mrbgems/mruby-fiber/src/fiber.c
@@ -125,6 +125,7 @@ fiber_init(mrb_state *mrb, mrb_value self)
   ci = c->ci;
   ci->target_class = p->target_class;
   ci->proc = p;
+  mrb_field_write_barrier(mrb, (struct RBasic*)mrb_obj_ptr(self), (struct RBasic*)p);
   ci->pc = p->body.irep->iseq;
   ci->nregs = p->body.irep->nregs;
   ci[1] = ci[0];
-- 
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