--TEST--UBSan phpdbg_frame member access within null pointer of type 'zval'--FILE--<?phpclass C {    public function __destruct() {        echo __METHOD__, "\n";    }}$fiber = new Fiber(function () {    $c = new C();    $fiber = Fiber::getCurrent();    Fiber::suspend();});$fiber->start();gc_collect_cycles();$fiber = null;gc_collect_cycles();?>--PHPDBG--rtev 1 + 2cq--EXPECT--C::__destruct

[Successful compilation of /test.php]prompt> [Uncaught GracefulExit in  on line 0: ]>00014:     Fiber::suspend(); 00015: }); 00016:prompt> frame #0: {closure}() at /test.php:14//php-src/sapi/phpdbg/phpdbg_frame.c:295:2: runtime error: member access within null pointer of type 'zval' (aka 'struct _zval_struct')SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /php-src/sapi/phpdbg/phpdbg_frame.c:295:2 in