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Bug #41411 imagecreatetruecolor memory break?
Submitted: 2007-05-16 17:54 UTC Modified: 2008-06-17 21:19 UTC
From: eth at ethaniel dot com Assigned: pajoye (profile)
Status: Not a bug Package: GD related
PHP Version: 5.2.2 OS: Linux FC 6 2.6.18
Private report: No CVE-ID: None
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From: eth at ethaniel dot com
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 [2007-05-16 17:54 UTC] eth at ethaniel dot com 
Description:
------------
I run a image thumbnail service on my server, it runs under priority of +11. It has a memory limit set to 520M.

On some images it exits with "Allowed memory size of 545259520 bytes exhausted" when I do imagecreatetruecolor(500,375). 

Memory usage details below.

Reproduce code:
---------------
if ($photo_id==2348804) error_log(memory_get_usage()." - $newX - $newY");

$newImg = ImageCreateTrueColor($newX, $newY);

if ($photo_id==2348804) error_log(memory_get_usage()." - $newX - $newY");

Expected result:
----------------
following entry in error log

[16-May-2007 19:10:27] 6451636 - 500 - 375
[16-May-2007 18:34:24] PHP Fatal error:  Allowed memory size of 545259520 bytes exhausted (tried to allocate 2000 bytes) in /data1/albums/retreive.php3 on line 427

Actual result:
--------------
I checked the memory usage right before imagecreatetruecolor and it was at 6.4M. The memory limit was set to 512M, script run under nice +11.

It crashes on imagecreatetruecolor.

But when I set the memory limit to 10000M it works ok and the code above returns.

[16-May-2007 19:10:27] 6451636 500 - 375
[16-May-2007 19:10:27] 7405476 500 - 375

As you can see, the real memory usage raised only about 1MB instead of hitting the upper limit of 500MB.

This happened only on some images. Don't know why.

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AllCommentsChangesGit/SVN commitsRelated reports
 [2007-05-16 17:55 UTC] eth at ethaniel dot com 
Sorry, I messed up when submitting the bug report. Expected and Actual results fields are to be switched places.
 [2007-05-16 18:33 UTC] tony2001@php.net 
./sapi/cli/php -r 'var_dump(memory_get_usage()); $newImg = ImageCreateTrueColor(500, 375); var_dump(memory_get_usage());'
int(88476)
int(1069836)
 [2007-05-24 01:00 UTC] php-bugs at lists dot php dot net 
No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".
 [2008-06-17 20:34 UTC] anonymous at anonymous dot com 
Upgrade to 5.2.6.
 [2008-06-17 21:19 UTC] pajoye@php.net 
I suppose you are uploading an image as well?

But there is no such bug in imagecreatetruecolor, really not.
 
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