[php-src] Issue #22650: Assertion failure `zend_weakref_unregister(zend_object *, void *, _Bool): Assertion 'tagged_ptr && "Weakref not registered?"' failed`

[email protected] (YuanchengJiang) Thu, 9 Jul 2026 08:47:42 +0000
Newsgroups php.bugs
Message-ID <[email protected]>
Issue: https://github.com/php/php-src/issues/22650
Author: YuanchengJiang

### Description

The following code:

```php
<?php
try {
function garbageCollectionTrigger() {
for ($i = 0; $i < 10000; $i++) {
$obj = new stdClass();
$weakReferences[] = WeakReference::create($obj);
garbageCollectionTrigger();
$root = $document->createElement('root');
$document = new DomDocument();
}
gc_collect_cycles();
}
garbageCollectionTrigger();
} catch (\Throwable $_ffl_e) {}
```

Resulted in this output:
```
php: /home/fuzz/WorkSpace/fusion-fuzz/projects/php/php-src/Zend/zend_weakrefs.c:126: void zend_weakref_unregister(zend_object *, void *, _Bool): Assertion `tagged_ptr && "Weakref not registered?"' failed.
Aborted (core dumped)
```

To reproduce:
```
/home/fuzz/WorkSpace/fusion-fuzz/projects/php/php-src/sapi/cli/php  ./test.php
```

Commit:
```
9dc29aafa5eecc71a9f9e2c7607b588597a91810
```

Configurations:
```
CC="clang-12" CXX="clang++-12" CFLAGS="-DZEND_VERIFY_TYPE_INFERENCE" CXXFLAGS="-DZEND_VERIFY_TYPE_INFERENCE" ./configure --enable-debug --enable-address-sanitizer --enable-undefined-sanitizer --enable-re2c-cgoto --enable-fpm --enable-litespeed --enable-phpdbg-debug --enable-zts --enable-bcmath --enable-calendar --enable-dba --enable-dl-test --enable-exif --enable-ftp --enable-gd --enable-gd-jis-conv --enable-mbstring --enable-pcntl --enable-shmop --enable-soap --enable-sockets --enable-sysvmsg --enable-zend-test --with-zlib --with-bz2 --with-curl --with-enchant --with-gettext --with-gmp --with-mhash --with-ldap --with-libedit --with-readline --with-snmp --with-sodium --with-xsl --with-zip --with-mysqli --with-pdo-mysql --with-pdo-pgsql --with-pgsql --with-sqlite3 --with-pdo-sqlite --with-webp --with-jpeg --with-freetype --enable-sigchild --with-readline --with-pcre-jit --with-iconv
```

Operating System:
```
Ubuntu 20.04 Host, Docker 0599jiangyc/flowfusion:latest
```

*This bug was found by [fusion-fuzz](https://github.com/fusion-fuzz/fusion-fuzz)*

### PHP Version

```plain
nightly
```

### Operating System

_No response_