From: laden100 at mail dot ru
Operating system: Solaris
PHP version: 5.2.3
PHP Bug Type: Session related
Bug description: Same processes of one session are executed simultaneously
Description:
------------
If more than one process of the same session is created in the one time,
this processes are executed simultaneously instead of being executed one
after another.
Reproduce code:
---------------
<?php
//For example this script is asked three times simultaneously from the
one user, siting on the one session ID
require_once('db_fns.php'); //requiring mysql functions and connecting to
database
require_once('session.php'); //creating session from MySQL storage
$sessid = session_id();
$example = db_query_onerow("SELECT example FROM table WHERE id=1"); //etc
the field `example` is "1" by default. So all three times every process has
the value "1"
echo "Example: $example"; //So every time we will get "1"
$lock = db_query_onerow("SELECT GET_LOCK('database.lock_{$sessid}',
60);"); //Getting lock to test the bug of PHP
$anotherexample = db_query_onerow("SELECT example FROM table WHERE
id=1"); //This Select will be not executed at the one time because of MySQL
locks and will give us the right values
echo "Another Example: $anotherexample"; //At the first time it will be
"1" and two other time "0"
db_query_write("UPDATE table SET example=0 WHERE id=1"); //Setting the
field `example` to 0
$lock = db_query_onerow("SELECT
RELEASE_LOCK('database.lock_{$sessid}')"); //Getting lock to test the bug
?>
Expected result:
----------------
Example: 1
Another Example: 1
Example: 0
Another Example: 0
Example: 0
Another Example: 0
Actual result:
--------------
Example: 1
Example: 1
Example: 1
Another Example: 1
Another Example: 0
Another Example: 0
--
Edit bug report at http://bugs.php.net/?id=41705&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=41705&r=trysnapshot44
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=41705&r=trysnapshot52
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=41705&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=41705&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=41705&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=41705&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=41705&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=41705&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=41705&r=support
Expected behavior: http://bugs.php.net/fix.php?id=41705&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=41705&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=41705&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=41705&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=41705&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=41705&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=41705&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=41705&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=41705&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=41705&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=41705&r=mysqlcfg
