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Segmentation fault in zend_unfinished_execution_gc_ex found by php-execute-fuzz #19306
Description
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
Operating System
No response
Activity
Fix dangling stack frames with fibers and nested generators
Prevent resumption of generator suspended in yield from
arnaud-lb commentedon Jul 31, 2025
Thank you @gal1ium!