#42369 [Com]: Implicit conversion to string leaks memory

ID: 42369 Comment by: jfdsmit at gmail dot com Reported By: david at acz dot org Status: Open Bug Type: SimpleXML related Operating System: SuSE Linux PHP Version: 5.2.3 New Comment: Could reproduce on 5.2.4 running on IIS6.0/W2k3. php5isapi.dll will crash inetinfo.exe and all IIS related stuff will cease to function. Explicitly casting every access to the SimpleXML object will fix random crashes. Previous Comments: ------------------------------------------------------------------------ [2007-08-23 15:32:04] david at acz dot org I could reproduce on php5.2-200708231430 (32-bit). ------------------------------------------------------------------------ [2007-08-23 01:02:58] stas@php.net Please try using this CVS snapshot: http://snaps.php.net/php5.2-latest.tar.gz For Windows (zip): http://snaps.php.net/win32/php5.2-win32-latest.zip For Windows (installer): http://snaps.php.net/win32/php5.2-win32-installer-latest.msi couldn't reproduce on latest 5.2.4 RC ------------------------------------------------------------------------ [2007-08-21 23:30:17] david at acz dot org Description: ------------ Passing a SimpleXML string object to most builtin string functions causes a memory leak. Reproduce code: --------------- #!/usr/local/bin/php -d memory_limit=128M <? $xml = '<?xml version="1.0" encoding="utf-8"?>'; $x = simplexml_load_string($xml . "<q><x>foo</x></q>"); echo "explicit conversion\n"; for ($i = 0; $i < 1000000; $i++) md5(strval($x->x)); echo "no conversion\n"; for ($i = 0; $i < 1000000; $i++) md5($x->x); echo "done\n"; ?> Expected result: ---------------- $ ./crash.php explicit conversion no conversion done Actual result: -------------- $ ./crash.php explicit conversion no conversion Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 40 bytes) in /tmp/crash.php on line 12 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=42369&edit=1