From 14c21793a01e4caa802e600540628fe9ae622d54 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Wed, 23 May 2018 08:27:22 +0900
Subject: Check if the exception is frozen; fix #4025

`exc_debug_info()` and `mrb_keep_backtrace()` raise `FrozenError`
if the exception is frozen and lead to infinite loop.
---
 src/error.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/error.c')

diff --git a/src/error.c b/src/error.c
index 5445b51bf..599612b97 100644
--- a/src/error.c
+++ b/src/error.c
@@ -233,7 +233,7 @@ mrb_exc_set(mrb_state *mrb, mrb_value exc)
         (struct RBasic*)mrb->exc == mrb->gc.arena[mrb->gc.arena_idx-1]) {
       mrb->gc.arena_idx--;
     }
-    if (!mrb->gc.out_of_memory) {
+    if (!mrb->gc.out_of_memory && !MRB_FROZEN_P(mrb->exc)) {
       exc_debug_info(mrb, mrb->exc);
       mrb_keep_backtrace(mrb, exc);
     }
-- 
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