Segmentation fault in `zend_unfinished_execution_gc_ex` found by `php-execute-fuzz`

[gal1ium]

Description

The following code:

<?php
class It implements IteratorAggregate
{
    public function getIterator(): Generator
    {
        yield "";
        Fiber::suspend();
    }
}
function g()
{
    yield from new It();
}
function gen($gen)
{
    yield from $gen;
}
$a = g();
$b = gen($a);
$fiber = new Fiber(function () use ($b) {
    $b->next();
});
$fiber->start();
while ($a->valid()) {
    $a->next();
}

Resulted in this output:

Segmentation fault (core dumped)

PHP Version

16b2fc4

Operating System

No response

[arnaud-lb]

Thank you @gal1ium!