[FFI] Segmentation fault when calling callback function

Description

The following code:

<?php
class Test {
   public $lib;
   public function __construct() {
      $this->lib = \FFI::cdef("extern void setCloseSessionCallback(void(*fun)(unsigned long cid));
      extern void testCloseSessionCallback();
      ", "./libsomelib.so");
   }
}

$tclass = new Test();
$tclass->lib->setCloseSessionCallback(function($cid){
   echo "ok\n";
});

$tclass->lib->testCloseSessionCallback(); //this function creates new std::thread from c++ stl, sleeps 2 seconds and calls function passed to setCloseSessionCallback
while(true); //prevent php script from completion because testCloseSessionCallback running in other thread

Resulted in this output:

segmentation fault (core dumped)

But I expected this output instead:

ok

gdb backtrace:

PHP Version

PHP 8.0.21 (zts) with Zend OPcache v8.0.21

Operating System

Manjaro Linux

Comienza con la reproducción de PHP FFI en el issue, incluido el callback registrado a través de libsomelib.so y el hilo de C++ que lo invoca. Usa el backtrace de gdb proporcionado mientras pruebas la configuración de PHP 8.0.21 ZTS en Manjaro Linux. Se considera terminado cuando el callback imprime "ok" sin un segmentation fault.