From: mb at diderot dot de
Operating system: Linux
PHP version: 4.3.6
PHP Bug Type: Session related
Bug description: readfile + session_start results in huge memory consumption
Description:
------------
When using readfile or fread in combination with
session_start php seems to allocate memory for the whole
filesize. Without session_start it doesn't.
Replacing readfile by a fread loop doesn't make any
difference.
Reproduce code:
---------------
<?php
//error appears:
session_start();
readfile('big.zip'); //big.zip > memory_limit
?>
<?php
//working fine:
readfile('big.zip'); //big.zip > memory_limit
?>
<?php
//fread version, same error
session_start();
$fp = fopen('big.zip');
while($d = fread($fp,4096)) {
echo $d;
flush();
}
?>
Expected result:
----------------
Memory consumation should stay much bellow the whole
filesize as it does without sessions.
Actual result:
--------------
apache error.log:
Allowed memory size of 16777216 bytes exhausted (tried to
allocate 138188800 bytes)
--
Edit bug report at http://bugs.php.net/?id=28260&edit=1
--
Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=28260&r=trysnapshot4
Try a CVS snapshot (php5): http://bugs.php.net/fix.php?id=28260&r=trysnapshot5
Fixed in CVS: http://bugs.php.net/fix.php?id=28260&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=28260&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=28260&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=28260&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=28260&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=28260&r=support
Expected behavior: http://bugs.php.net/fix.php?id=28260&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=28260&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=28260&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=28260&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=28260&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=28260&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=28260&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=28260&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=28260&r=float
