From 5955ce898789ca691559baf69d8ab5a1d6136548 Mon Sep 17 00:00:00 2001
From: Ilija Tovilo <ilija.tovilo@me.com>
Date: Tue, 8 Oct 2024 14:39:58 +0200
Subject: [PATCH] Fix segfault on debug_backtrace() in _ZendTestFiber

Fixes GH-16230
Closes GH-16299
---
 ext/zend_test/fiber.c            |  1 +
 ext/zend_test/tests/gh16230.phpt | 22 ++++++++++++++++++++++
 2 files changed, 23 insertions(+)
 create mode 100644 ext/zend_test/tests/gh16230.phpt

diff --git a/ext/zend_test/fiber.c b/ext/zend_test/fiber.c
index fc673801f7a..a4aa8498e41 100644
--- a/ext/zend_test/fiber.c
+++ b/ext/zend_test/fiber.c
@@ -91,6 +91,7 @@ static ZEND_STACK_ALIGNED void zend_test_fiber_execute(zend_fiber_transfer *tran
 		execute_data = (zend_execute_data *) stack->top;
 
 		memset(execute_data, 0, sizeof(zend_execute_data));
+		execute_data->func = (zend_function *) &zend_pass_function;
 
 		EG(current_execute_data) = execute_data;
 		EG(jit_trace_num) = 0;
diff --git a/ext/zend_test/tests/gh16230.phpt b/ext/zend_test/tests/gh16230.phpt
new file mode 100644
index 00000000000..42487df5b94
--- /dev/null
+++ b/ext/zend_test/tests/gh16230.phpt
@@ -0,0 +1,22 @@
+--TEST--
+GH-16230: Segfault on debug_backtrace() inside _ZendTestFiber
+--EXTENSIONS--
+zend_test
+--FILE--
+<?php
+$test = new _ZendTestFiber(function (): void {
+    var_dump(debug_backtrace());
+});
+$test->start();
+?>
+--EXPECT--
+array(1) {
+  [0]=>
+  array(2) {
+    ["function"]=>
+    string(9) "{closure}"
+    ["args"]=>
+    array(0) {
+    }
+  }
+}