Bug #52109 [NEW]: session_start / session_write_close memory leak

From: Operating system: Linux PHP version: 5.3.2 Package: Session related Bug Type: Bug Bug description:session_start / session_write_close memory leak Description: ------------ session_start() and session_write_close() don't free unused memory. When they are called multiple times, the memory usage reported by memory_get_usage() constantly grows. The session data is stored in files, ini settings are default. # php -v PHP 5.2.9 (cli) (built: Sep 1 2009 11:43:38) Copyright (c) 1997-2009 The PHP Group Zend Engine v2.2.0, Copyright (c) 1998-2009 Zend Technologies with Suhosin v0.9.31, Copyright (c) 2007-2010, by SektionEins GmbH Test script: --------------- session_start(); $_SESSION["foo"] = str_repeat("bar", 5000); session_write_close(); $memory_before = round(memory_get_usage() / 1024, 2) . "KB"; for ($i=0; $i<1000; $i++) { session_start(); session_write_close(); } $memory_after = round(memory_get_usage() / 1024, 2) . "KB"; echo "Before: " . $memory_before . "\n"; echo "After: " . $memory_after; Expected result: ---------------- Before: 88.34KB After: 88.34KB (or something small amount) Actual result: -------------- Before: 88.34KB After: 19906.61K -- Edit bug report at http://bugs.php.net/bug.php?id=52109&edit=1 -- Try a snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=52109&r=trysnapshot52 Try a snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=52109&r=trysnapshot53 Try a snapshot (trunk): http://bugs.php.net/fix.php?id=52109&r=trysnapshottrunk Fixed in SVN: http://bugs.php.net/fix.php?id=52109&r=fixed Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=52109&r=needdocs Fixed in release: http://bugs.php.net/fix.php?id=52109&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=52109&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=52109&r=needscript Try newer version: http://bugs.php.net/fix.php?id=52109&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=52109&r=support Expected behavior: http://bugs.php.net/fix.php?id=52109&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=52109&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=52109&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=52109&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=52109&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=52109&r=dst IIS Stability: http://bugs.php.net/fix.php?id=52109&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=52109&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=52109&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=52109&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=52109&r=mysqlcfg