PHP 4.0 Bug #9240 Updated: unserialize fails non-determenistic on large objects
| From: | brian at kusala dot com | Date: | Tue, 20 Mar 2001 12:53:17 +0000 |
| Subject: | PHP 4.0 Bug #9240 Updated: unserialize fails non-determenistic on large objects | ||
| Groups: | php.dev | ||
| Request: | Send a blank email to php-dev+get-49485@lists.php.net to get a copy of this message | ||
ID: 9240
User Update by: brian@kusala.com
Old-Status: Feedback
Status: Open
Bug Type: Variables related
Description: unserialize fails non-determenistic on large objects
I have noticed a tendancy for this to occur when the server is particularly short on memory. My
impression is that it is failing with a "can't unserialize at" error instead of a
memory error.
Previous Comments:
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[2001-02-22 10:54:03] stas@php.net
Could you please send me smallest possible object that has
this behaviour? If it's large, please compress it.
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[2001-02-13 10:38:17] brian@kusala.com
I'm unserializing a large object using the following test script:
for ($i = 0; $i < 20; $i++)
{
echo "$in";
$ObjectToCreate = array();
if (!$fp = fopen('test.ser', 'r'))
return false;
$ObjectToCreate = unserialize(fread ($fp, filesize ('test.ser')));
fclose($fp);
}
I get the following output:
0
1
2
3
4
5
6
PHP Warning: unserialize() failed at offset 2150380 of 3601223 bytes in test.inc on line 8
<font color=ff0000><br>
<b>Warning</b>: unserialize() failed at offset 2150380 of 3601223 bytes in
<b>test.inc</b> on line <b>8</b><br>
</font>7
8
9
10
11
PHP Warning: unserialize() failed at offset 2822123 of 3601223 bytes in test.inc on line 8
<font color=ff0000><br>
<b>Warning</b>: unserialize() failed at offset 2822123 of 3601223 bytes in
<b>test.inc</b> on line <b>8</b><br>
</font>12
13
14
15
16
17
18
19
Repeatedly running the script produces different output each time with different numbers of failures
at different offsets. So far the lowest offset at which I have had a problem is about 650000.
I can supply the 'test.ser' file on request but for obvious reasons do not wish to include
it in this error report!
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Full Bug description available at: http://bugs.php.net/?id=9240