From 3e0eea644f31b0a80da143c18149c750712d833d Mon Sep 17 00:00:00 2001
From: Peter Zhu <peter@peterzhu.ca>
Date: Sat, 23 Mar 2024 12:08:48 -0400
Subject: [PATCH] Don't set RUBY_TYPED_EMBEDDABLE flag on backtrace

---
 vm_backtrace.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/vm_backtrace.c b/vm_backtrace.c
index 3fbb8d1e3b..6f4379ad23 100644
--- a/vm_backtrace.c
+++ b/vm_backtrace.c
@@ -540,7 +540,10 @@ static const rb_data_type_t backtrace_data_type = {
         NULL, // No external memory to report,
         backtrace_update,
     },
-    0, 0, RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_WB_PROTECTED | RUBY_TYPED_EMBEDDABLE
+    /* Cannot set the RUBY_TYPED_EMBEDDABLE flag because the loc of frame_info
+     * points elements in the backtrace array. This can cause the loc to become
+     * incorrect if this backtrace object is moved by compaction. */
+    0, 0, RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_WB_PROTECTED
 };
 
 int