From c32fd1b5ed6709dfbed3d19cac881886576e231b Mon Sep 17 00:00:00 2001
From: Peter Zhu <peter@peterzhu.ca>
Date: Mon, 23 Sep 2024 11:56:29 -0400
Subject: Add debugging code to vm_objtostring in ASAN

To debug this issue on CI:
http://ci.rvm.jp/logfiles/brlog.trunk_asan.20240922-002945
---
 vm_insnhelper.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index 543f31a3b1..8174d7ee9a 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -6056,6 +6056,13 @@ VALUE rb_mod_name(VALUE);
 static VALUE
 vm_objtostring(const rb_iseq_t *iseq, VALUE recv, CALL_DATA cd)
 {
+    // Debugging code for ASAN issues such as:
+    // http://ci.rvm.jp/logfiles/brlog.trunk_asan.20240922-002945
+    if (asan_poisoned_object_p(recv)) {
+        asan_unpoison_object(recv, false);
+        rb_bug("vm_objtostring: recv is poisoned (type %d)", TYPE(recv));
+    }
+
     int type = TYPE(recv);
     if (type == T_STRING) {
         return recv;
-- 
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