From c8da60275281dc54310aa0d7e45085c55ee8bda3 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Fri, 17 Nov 2017 01:08:46 +0900
Subject: Need to save stack space by number of registers from the current
 proc,

Not from the execution ensure proc; fix #3849
---
 src/vm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/vm.c b/src/vm.c
index dd68e8a79..6bf6877a4 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -309,6 +309,7 @@ static void
 ecall(mrb_state *mrb, int i)
 {
   struct RProc *p;
+  int nregs;
   struct mrb_context *c = mrb->c;
   mrb_callinfo *ci = c->ci;
   struct RObject *exc;
@@ -323,6 +324,7 @@ ecall(mrb_state *mrb, int i)
   p = c->ensure[i];
   if (!p) return;
   mrb_assert(!MRB_PROC_CFUNC_P(p));
+  nregs = ci->proc->body.irep->nregs;
   c->ensure[i] = NULL;
   cioff = ci - c->cibase;
   ci = cipush(mrb);
@@ -335,7 +337,7 @@ ecall(mrb_state *mrb, int i)
   ci->target_class = MRB_PROC_TARGET_CLASS(p);
   env = MRB_PROC_ENV(p);
   mrb_assert(env);
-  c->stack += p->body.irep->nregs;
+  c->stack += nregs;
   exc = mrb->exc; mrb->exc = 0;
   if (exc) {
     mrb_gc_protect(mrb, mrb_obj_value(exc));
-- 
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