From 9b8956cdd0165e1bc2295694720b5c70dba39fce Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Sat, 1 Jul 2017 12:30:15 +0900
Subject: `break` should not cross fiber-context boundary; fix #3724

---
 src/vm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/vm.c b/src/vm.c
index 93f2eceba..4fca2b2ac 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -1991,6 +1991,9 @@ RETRY_TRY_BLOCK:
           if (!proc->env || !MRB_ENV_STACK_SHARED_P(proc->env)) {
             goto L_BREAK_ERROR;
           }
+          if (proc->env->cxt.c != mrb->c) {
+            goto L_BREAK_ERROR;
+          }
           while (mrb->c->eidx > mrb->c->ci->epos) {
             ecall(mrb, --mrb->c->eidx);
           }
-- 
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