From: tdondich at groundworkopensource dot com
Operating system: Ubuntu Edgy
PHP version: 5.2.0
PHP Bug Type: Apache2 related
Bug description: Apache2 with simple PHP Script consumes all available memory
Description:
------------
Using:
- Apache 2.2.4
- PHP 5.2.0 w/ sessions
Description:
When running this simple script, Apache2 will consume all available memory
and the script will not complete (with no memory limit and high time limit)
until all memory is taken by Apache 2 process and system starts to fail
(swap extensively until nothing is responsive).
Reproduce code:
---------------
<?php
session_start();
$myarray = array();
$numOfIterations = 100000; // Set to 10000 to see the script succeed
for($counter = 0; $counter < $numOfIterations; $counter++) {
$myarray[$counter] =
'jkdfjklsdfjklfsdhjklsdfhildfnifsdnsdfnlfsdnklfsdnkglgfnkl;nmklsdf';
}
// copy the array, just for kicks
$_SESSION['test'] = $myarray;
sleep(5); // See the memory usage in top for awhile
print("Completed.");
?>
Expected result:
----------------
Apache2 process (pre-fork) will consume all available memory and continue
to climb until system swaps excessively and then becomes unresponsive.
Changing the $numOfIterations to 10000 causes it to succeed.
By my account, the memory needed approx for each array is:
100000 X 66 = 6600000bytes
6600000 / 1048576 = 6 megabytes
Even when copying it to $_SESSION, it should only take 12 megs, plus maybe
a little more for overhead (array constructs, program execution). We're
seeing consumption of over a gigabyte and growing with one script
execution.
Actual result:
--------------
TAKEN FROM TOP:
Mem: 1035632k total, 1021568k used, 14064k free, 1208k buffers
Swap: 3028212k total, 432996k used, 2595216k free, 40336k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
16094 tdondich 16 0 344m 86m 5172 S 1 8.6 15:16.51 java
4205 root 15 0 197m 19m 3960 S 1 1.9 31:37.61 Xorg
28209 daemon 18 0 779m 704m 2148 D 1 69.7 0:04.34 httpd
No other pages being served on this box. The script was continuing to
execute at this time.
--
Edit bug report at http://bugs.php.net/?id=40222&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=40222&r=trysnapshot44
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=40222&r=trysnapshot52
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=40222&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=40222&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=40222&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=40222&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=40222&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=40222&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=40222&r=support
Expected behavior: http://bugs.php.net/fix.php?id=40222&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=40222&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=40222&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=40222&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=40222&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=40222&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=40222&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=40222&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=40222&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=40222&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=40222&r=mysqlcfg
