Description:
------------
If you put an 

ini_set("open_basedir","/var/www/mydir"); 

in your code,

the first time it will work, put if you reload the page quickly, you will get a "open_basedir restriction in effect" on a jammed directory !

If I wait 1 minute, it works again for the first time and no more the next times : looks like a cache problem.

I do not have APC, xdebug etc...

Nothing in php.ini except the error_reporting turned to On.

the configure :

'./configure' '--with-apxs2=/usr/bin/apxs2' '--disable-short-tags' '--with-openssl' '--with-zlib' '--enable-bcmath' '--with-bz2=/bin/bzip2' '--enable-calendar' '--with-curl' '--with-curlwrappers' '--enable-exif' '--enable-ftp' '--with-gd' '--with-jpeg-dir=/usr/lib' '--with-png-dir=/usr/lib' '--with-xpm-dir=/usr/lib' '--with-ttf' '--with-t1lib' '--enable-gd-native-ttf' '--enable-gd-jis-conv' '--with-gettext' '--with-imap' '--with-imap-ssl' '--with-ldap' '--with-ldap-sasl' '--enable-mbstring' '--with-mcrypt' '--with-mhash' '--with-ming' '--with-mysql=mysqlnd' '--with-mysqli=mysqlnd' '--with-ncurses' '--with-pdo-mysql' '--with-pspell' '--with-readline' '--with-snmp' '--enable-soap' '--enable-sockets' '--without-sqlite' '--enable-sqlite-utf8' '--with-tidy' '--enable-wddx' '--with-xmlrpc' '--with-xsl' '--enable-zip' '--with-pear' '--with-kerberos'

Note : I use PHP as a Apache module

Reproduce code:
---------------
In /var/www/elapouya, I create the file open_basedir.php :

<?php
ini_set("open_basedir","/var/www/elapouya");
?>



Expected result:
----------------
no error

Actual result:
--------------
First time : No error,

Next times :

Warning: Unknown: open_basedir restriction in effect. File(/var/www/elapouya/open_basedir.php) is not within the allowed path(s): (??¸/www/elapouya) in Unknown on line 0

Warning: Unknown: failed to open stream: Operation not permitted in Unknown on line 0

Fatal error: Unknown: Failed opening required '/var/www/elapouya/open_basedir.php' (include_path='.:/usr/local/lib/php') in Unknown on line 0