Bug #73684 [Nab->ReO]: Can be segmentation fault

Edit report at https://bugs.php.net/bug.php?id=73684&edit=1 ID: 73684 Updated by: cmb@php.net Reported by: deepvavar at mail dot ru Summary: Can be segmentation fault -Status: Not a bug +Status: Re-Opened Type: Bug Package: Scripting Engine problem Operating System: All PHP Version: Irrelevant -Assigned To: cmb +Assigned To: Block user comment: N Private report: N New Comment: Well, simplified reproduce script: <?php function foo() { foo(); } foo(); Crashes all PHP versions. Anyway, as you insist this is a bug in PHP, I'm re-opening. Previous Comments: ------------------------------------------------------------------------ [2016-12-08 13:56:32] thisisabug at server dot com This is php bug, because php trying write data with incorrect pointer or incorrect size. Xdebug/etc. just limiter. Without xdebug can be segfault. But maybe (as you see) this issue not for all php versions/packages. ------------------------------------------------------------------------ [2016-12-08 13:29:16] cmb@php.net Yes, this is a bug, but it is not a bug in PHP, but rather in the supplied reproduce script. ------------------------------------------------------------------------ [2016-12-08 13:16:01] thisisabug at server dot com This is a bug, because OS kill php process with incorrect write to memory. ------------------------------------------------------------------------ [2016-12-08 12:57:31] cmb@php.net Thank you for taking the time to write to us, but this is not a bug. Please double-check the documentation available at http://www.php.net/manual/ and the instructions on how to report a bug at http://bugs.php.net/how-to-report.php public static function bar($b) { $b->b = self::$a->getNewB(); self::bar($b->b); } causes infinite recursion, what is considered to be a programming error[1]. The fact that the script terminates differently is caused by different settings. On your Windows PHP 5.4 there is Xdebug enabled, for instance. [1] <http://php.net/manual/en/functions.user-defined.php#example-130> ------------------------------------------------------------------------ [2016-12-08 11:58:24] deepvavar at mail dot ru Description: ------------ Can be segmentation fault Test script: --------------- <?php class a { public function getNewB() { $b = new b(); $b->a = $this; return $b; } } class b { public $a = null; public $b = null; } class x { public static $a = null; public static $b = null; public static function foo() { self::$a = new a(); self::$b = self::$a->getNewB(); self::bar(self::$b); } public static function bar($b) { $b->b = self::$a->getNewB(); self::bar($b->b); } } x::foo(); Expected result: ---------------- Without segfault Actual result: -------------- ~$ php test.php Segmentation fault ~$ php -v PHP 5.6.22-0+deb8u1 (cli) (built: Jun 13 2016 07:55:54) Copyright (c) 1997-2016 The PHP Group Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend Technologies ~$ cat /etc/debian_version 8.5 ------------------------------------------ Fatal error: Maximum function nesting level of '100' reached, aborting! Windows, php 5.4 ------------------------------------------ > php test.php fish: “php test.php” terminated by signal SIGSEGV (Address boundary error) > php -version PHP 5.6.28 (cli) (built: Nov 9 2016 07:56:15) Copyright (c) 1997-2016 The PHP Group Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies ------------------------------------------ # php t.php Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 130968 bytes) in /t.php on line 29 # php -v PHP 5.6.28 (cli) (built: Dec 6 2016 22:12:29) Copyright (c) 1997-2016 The PHP Group Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies With php 7.1: Fatal error: Allowed memory size ------------------------------------------ ~$ php test.php Segmentation fault ~$ php -v PHP 7.0.13-2 (cli) ( NTS ) Copyright (c) 1997-2016 The PHP Group Zend Engine v3.0.0, Copyright (c) 1998-2016 Zend Technologies with Zend OPcache v7.0.13-2, Copyright (c) 1999-2016, by Zend Technologies ------------------------------------------ $ php test.php Segmentation fault $ php -v PHP 7.0.8-0ubuntu0.16.04.3 (cli) ( NTS ) Copyright (c) 1997-2016 The PHP Group Zend Engine v3.0.0, Copyright (c) 1998-2016 Zend Technologies with Zend OPcache v7.0.8-0ubuntu0.16.04.3, Copyright (c) 1999-2016, by Zend Technologies ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=73684&edit=1