Bug #55365 [Opn->Fbk]: Using reference variable to $this in callback causes a segfault

Edit report at https://bugs.php.net/bug.php?id=55365&edit=1 ID: 55365 Updated by: felipe@php.net Reported by: dan at velsoft dot com Summary: Using reference variable to $this in callback causes a segfault -Status: Open +Status: Feedback Type: Bug Package: Reproducible crash Operating System: OS X 10.7 PHP Version: 5.3.6 Block user comment: N Private report: N New Comment: Thank you for this bug report. To properly diagnose the problem, we need a backtrace to see what is happening behind the scenes. To find out how to generate a backtrace, please read http://bugs.php.net/bugs-generating-backtrace.php for *NIX and http://bugs.php.net/bugs-generating-backtrace-win32.php for Win32 Once you have generated a backtrace, please submit it to this bug report and change the status back to "Open". Thank you for helping us make PHP better. I can't reproduce it on linux 32 bit. Previous Comments: ------------------------------------------------------------------------ [2011-08-04 20:32:51] dan at velsoft dot com Description: ------------ Using a reference variable to $this within an anonymous function, in a class function causes a segfault. This previously worked in PHP 5.3.5. The segfault can be caused either when using the function as a closure, or as an anonymous function. The GDB output: GNU gdb 6.3.50-20050815 (Apple version gdb-1705) (Fri Jul 1 10:50:06 UTC 2011) Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "x86_64-apple-darwin"...Reading symbols for shared libraries ...................... done (gdb) run segfault.php Starting program: /usr/bin/php segfault.php Reading symbols for shared libraries +++++++++++++++++++++........................................................... ............................................................... done Reading symbols for shared libraries . done Reading symbols for shared libraries . done Reading symbols for shared libraries . done Reading symbols for shared libraries . done Program received signal EXC_BAD_ACCESS, Could not access memory. Reason: KERN_INVALID_ADDRESS at address: 0x00000001ffffffff 0x000000010035d53d in zend_std_get_method () Test script: --------------- <?php class Seg { public function fault() { $that = &$this; $callback = function() use ($that){}; $callback(); // Causes a segfault is_callable(function() use ($that){}); // Causes a segfault } } $obj = new Seg(); for($i = 0; $i < 5000; $i++) { $obj->fault(); } Expected result: ---------------- No segfault Actual result: -------------- Segfault ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=55365&edit=1