Description:
------------
php version 5.2.6
Build Date 	May 2 2008 18:01:20 
PHP API 	20041225
PHP Extension 	20060613
Zend Extension 	220060519

Apache/2.2.8 (Win32) PHP/5.2.6 
Apache API Version 	20051115 

Request URL http://host/file1.php
Request URL http://host/file2.php and refresh several times.
windows alert that httpd.exe - application error. notice a memory address can not be "read".

In Task manager during the operation, the process httpd.exe memory usage increment quickly, and then crashed.


Reproduce code:
---------------
file1.php
--------------------------
<?php
$int_shm = shmop_open(20000, 'c', 0600, 2048);
shmop_write($int_shm, 'abcd', 0);
shmop_close($int_shm);
echo "OK";
?>

file2.php
--------------------------
<?php
for($i = 0; $i < 10000; $i ++){
    $int_shm = shmop_open(20000, 'a', 0, 0);
    $str_data = trim(shmop_read($int_shm, 0, 100));
    shmop_close($int_shm);
}
echo $str_data;
echo "Done.<br />";
?>

Expected result:
----------------
Warning: shmop_open() [function.shmop-open]: unable to attach or create shared memory segment in F:\home\share_var2.php on line 3

Warning: shmop_read() [function.shmop-read]: no shared memory segment with an id of [0] in F:\home\share_var2.php on line 4

Warning: shmop_close() [function.shmop-close]: no shared memory segment with an id of [0] in F:\home\share_var2.php on line 5