From: romain dot riviere at gmail dot com
Operating system: Gentoo Linux 32bit
PHP version: 5.2.10
PHP Bug Type: *General Issues
Bug description: Memory leak ending up in Out of Memory errors
Description:
------------
While trying to diagnose apparently random Out of Memory errors in various
PHP scripts (including Drupal among others), I ended up using the code
pasted below for testing purposes.
Browing the resulting page several times always results in an
ever-increasing VSZ for apache processes (up to 4GB in my case) and
eventually Out of Memory errors way before the script itself actually
reaches the limit. The script was called with size=61 in my case
(memory_limit=64M). On an 8GB system, it might take as many as 30 requests
to recreate the bug. With a higher memory limit and value of the "size"
parameter, it will probably happen much sooner.
PHP compiled with
Reproduce code:
---------------
<?php
ini_set('display_errors',true);
if (isset($_GET['size']) && $_GET['size'] < 200) {
$mb = intval($_GET['size']);
}
else {
$mb=5;
}
$var = '';
echo 'Memory limit: '.ini_get('memory_limit').'<br>';
for ($i=0; $i<=$mb; $i++) {
$var.= str_repeat('a',1*1024*1024);
echo memory_get_usage().'<br>';
}
echo 'String length: '. strlen($var);
?>
Expected result:
----------------
For the first few runs, the script correctly displays the memory usage and
the value is consistent with the memory limit :
Memory limit: 64M
<snip>
String length: 65011712
Actual result:
--------------
Memory limit: 64M
<snip>
Fatal error: Out of memory (allocated 61341696) at
/var/tmp/portage/dev-lang/php-5.2.10/work/php-5.2.10/ext/standard/string.c:4599
(tried to allocate 1048577 bytes) in /home/acrm/OF-svn/2.0/test.php on line
14
Subsequent runs :
Fatal error: Out of memory (allocated 262144) at
/var/tmp/portage/dev-lang/php-5.2.10/work/php-5.2.10/ext/standard/string.c:4599
(tried to allocate 1048577 bytes) in /home/acrm/OF-svn/2.0/test.php on line
14
--
Edit bug report at http://bugs.php.net/?id=49501&edit=1
--
Try a snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=49501&r=trysnapshot52
Try a snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=49501&r=trysnapshot53
Try a snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=49501&r=trysnapshot60
Fixed in SVN:
http://bugs.php.net/fix.php?id=49501&r=fixed
Fixed in SVN and need be documented:
http://bugs.php.net/fix.php?id=49501&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=49501&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=49501&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=49501&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=49501&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=49501&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=49501&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=49501&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=49501&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=49501&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=49501&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=49501&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=49501&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=49501&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=49501&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=49501&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=49501&r=mysqlcfg
