Segmentation fault (stack overflow in phpdbg) in main/spprintf.c  #16041

<?php
final class StreamWrapper
{
    public $context;
}
$fusion = $context;
register_shutdown_function(function () {
    global $shutdown;
    $shutdown = true;
});
class Cycle {
    public $self;
    public function __construct() {
        $this->self = $this;
    }
}
class Canary {
    public $self;
    public function __construct() {
        $this->self = $fusion;
    }
    public function __destruct() {
        global $shutdown;
        if (!$shutdown) {
            work();
        }
    }
}
function work() {
    global $objs, $defaultThreshold;
    new Canary();
    // Create some collectable garbage so the next run will not adjust
    // threshold
    for ($i = 0; $i < 100; $i++) {
        new Cycle();
    }
    // Add potential garbage to buffer
    foreach (array_slice($objs, 0, $defaultThreshold) as $obj) {
        $o = $obj;
    }
}
work();
?>