Assertion failure Zend/zend_hash.c:1543

Description

The following code:

<?php
function Error2Exception($errno, $errstr, $errfile, $errline)
{
throw new MyException($errstr, $errno);
}
set_error_handler('Error2Exception');
function bar(array &$a): ?bool {
foreach ($a as $key => $val) {
if ($val === 2) {
unset($a[$fusion]);
}
}
}
function foo($a, bool $b): bool {
do {
$res = bar($a);
} while ($res === null && $n !== $n2);
}
foo([2,'a'=>5], false);

Resulted in this output:

php: /home/phpfuzz/WorkSpace/flowfusion/php-src/Zend/zend_hash.c:1543: zend_result zend_hash_del(HashTable *, zend_string *): Assertion `(zend_gc_refcount(&(ht)->gc) == 1) || ((ht)->u.flags & (1<<6))' failed.
Aborted (core dumped)

PHP Version

nightly

Operating System

No response

Run the supplied PHP reproducer against the nightly build, then inspect Zend/zend_hash.c around line 1543 and the hash deletion path. Trace why the assertion is reached; done means the reproducer no longer aborts and the failure has a regression test.