From b277c58e783f187cfff1b7bb5843d2e95d3c3b0b Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Wed, 8 Feb 2017 16:31:37 +0900
Subject: Mark classes referenced from saved backtrace.

Maybe related to #3438
---
 src/gc.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src')

diff --git a/src/gc.c b/src/gc.c
index 88d157d9c..1608dbcb2 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -857,7 +857,12 @@ root_scan_phase(mrb_state *mrb, mrb_gc *gc)
   mrb_gc_mark(mrb, (struct RBasic*)mrb->top_self);
   /* mark exception */
   mrb_gc_mark(mrb, (struct RBasic*)mrb->exc);
+  /* mark backtrace */
   mrb_gc_mark(mrb, (struct RBasic*)mrb->backtrace.exc);
+  e = (size_t)mrb->backtrace.n;
+  for (i=0; i<e; i++) {
+    mrb_gc_mark(mrb, (struct RBasic*)mrb->backtrace.entries[i].klass);
+  }
   /* mark pre-allocated exception */
   mrb_gc_mark(mrb, (struct RBasic*)mrb->nomem_err);
 #ifdef MRB_GC_FIXED_ARENA
-- 
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