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Bug #60785 Memory leak in IntlDateFormatter constructor
Submitted: 2012-01-17 22:14 UTC Modified: 2012-05-24 09:19 UTC
Votes:1
Avg. Score:5.0 ± 0.0
Reproduced:0 of 0 (0.0%)
From: tim at digicol dot de Assigned: cataphract
Status: Closed Package: I18N and L10N related
PHP Version: 5.3.9 OS: Linux 2.6.32 x86_64 CentOS 6.2
Private report: No CVE-ID:
 [2012-01-17 22:14 UTC] tim at digicol dot de
Description:
------------
Each time I create a new IntlDateFormatter instance, PHP 5.3.9 leaks memory. You 
can see in "top" that the RES column (resident size) keeps growing as long as the 
script is running; up to more than 500 MB for my example. (By the way, 
memory_get_usage() and the PHP memory limit don't report or act on this.)

I've noticed this because we're using long-running scripts with the 
PHP CLI - they eventually die when too much memory is used. This happens to me 
with older 5.3.x versions as well.

I tested with PHP 5.3.9 built with "./configure --enable-intl" on 64bit CentOS 
6.2, running in VMware Fusion on my Mac.

Thanks for looking into this, and for the great work on PHP!

Test script:
---------------
<?php

printf("Run 'top -p %s' in another shell to watch memory usage grow...\n", posix_getpid());

for ($i = 1; $i < 500000; $i++)
{
    $fmt = new IntlDateFormatter
    (
        'en_US',
        IntlDateFormatter::SHORT,
        IntlDateFormatter::NONE
    ); 
}

?>

Expected result:
----------------
[digicol@dcxcentos6vm ~]$ /usr/local/src/php-5.3.9/sapi/cli/php leak.php 
Run 'top -p 7211' in another shell to watch memory usage grow...

[digicol@dcxcentos6vm ~]$ top -p 7211

top - 00:13:05 up 12:37,  3 users,  load average: 0.34, 0.26, 0.34
Tasks:   1 total,   0 running,   1 sleeping,   0 stopped,   0 zombie
Cpu(s): 10.1%us,  3.7%sy,  0.0%ni, 79.7%id,  6.1%wa,  0.1%hi,  0.3%si,  0.0%st
Mem:   2054984k total,  1515064k used,   539920k free,   111760k buffers
Swap:   511992k total,   511992k used,        0k free,   121912k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                 
 7211 digicol   20   0  406m  21m  10m S  0.0  1.1   0:00.06 php    

Actual result:
--------------
[digicol@dcxcentos6vm ~]$ /usr/local/src/php-5.3.9/sapi/cli/php leak.php 
Run 'top -p 7211' in another shell to watch memory usage grow...

[digicol@dcxcentos6vm ~]$ top -p 7211

top - 00:01:18 up 12:26,  3 users,  load average: 0.95, 0.65, 0.50
Tasks:   1 total,   1 running,   0 sleeping,   0 stopped,   0 zombie
Cpu(s): 96.0%us,  3.3%sy,  0.0%ni,  0.0%id,  0.0%wa,  0.3%hi,  0.3%si,  0.0%st
Mem:   2054984k total,  1985784k used,    69200k free,    68784k buffers
Swap:   511992k total,   511860k used,      132k free,   122068k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                
 7211 digicol   20   0  908m 524m  10m R 97.9 26.2   1:15.58 php                                                                     

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 [2012-01-17 22:34 UTC] tim at digicol dot de
The phpinfo "intl" section says:

Internationalization support => enabled
version => 1.1.0
ICU version => 4.2.1
 [2012-01-27 22:15 UTC] carloschilazo at gmail dot com
If you unset the variable right after you create it, does the memory usage still 
increases?

<?php

printf("Run 'top -p %s' in another shell to watch memory usage grow...\n", 
posix_getpid());

for ($i = 1; $i < 500000; $i++)
{
    $fmt = new IntlDateFormatter
    (
        'en_US',
        IntlDateFormatter::SHORT,
        IntlDateFormatter::NONE
    ); 
    unset($fmt);
}

?>

?
 [2012-01-31 10:15 UTC] tim at digicol dot de
unset() doesn’t help, it still leaks memory.

(I had already tried this. In my understanding, reusing the $fmt variable should 
effectively unset the old instance anyway.)
 [2012-05-24 08:33 UTC] cataphract@php.net
-Status: Open +Status: Assigned -Assigned To: +Assigned To: cataphract
 [2012-05-24 09:10 UTC] cataphract@php.net
Automatic comment on behalf of cataphract
Revision: http://git.php.net/?p=php-src.git;a=commit;h=2da2de46a8dc9d44b624c40adb0d6bf698567167
Log: Fixed bug #60785
 [2012-05-24 09:12 UTC] cataphract@php.net
Automatic comment on behalf of cataphract
Revision: http://git.php.net/?p=php-src.git;a=commit;h=2da2de46a8dc9d44b624c40adb0d6bf698567167
Log: Fixed bug #60785
 [2012-05-24 09:19 UTC] cataphract@php.net
-Status: Assigned +Status: Closed
 [2012-05-24 09:19 UTC] cataphract@php.net
This bug has been fixed in SVN.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.

 For Windows:

http://windows.php.net/snapshots/
 
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