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From Alessandro Bottoni <abott...@quadrante.com>
Subject mod_rewrite/8278: memory lack or infinite loop in mod_rewrite?
Date Fri, 31 Aug 2001 15:24:52 GMT

>Number:         8278
>Category:       mod_rewrite
>Synopsis:       memory lack or infinite loop in mod_rewrite?
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    apache
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   apache
>Arrival-Date:   Fri Aug 31 08:30:00 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     abottoni@quadrante.com
>Release:        1.3.20 Windows 2000
>Organization:
apache
>Environment:
Apache 1.3.20 on Windows 2000 Pro Machine.
Pentium III 800 Mhz with 128 Mb RAM (Dell Optiplex GX150)
PHP 4.04pl - ezPublish 2.1 (developer.ez.no)
>Description:
Apparently, mod-rewrite enters an infinite loop and consumes all memory, until windows starts
compalining for low memory. It could be a memory lack, as well.
You can use the Task Manager to check the phenomenon. The consumption rate is something like
one Mb per minute on my machine.

I'm tring to install ezPublish 2.1 (see http://developer.ez.no). It uses both virtual hosts
and the rewrite engine. After having modified the httpd.conf file as descripted in their documentation,
I have got the memory problem.

>How-To-Repeat:
This is the relevant part of my httpd.conf:
---------------------------------------------------

#
# Dynamic Shared Object (DSO) Support
#
# To be able to use the functionality of a module which was built as a DSO you
# have to place corresponding `LoadModule' lines at this location so the
# directives contained in it are actually available _before_ they are used.
# Please read the file README.DSO in the Apache 1.3 distribution for more
# details about the DSO mechanism and run `apache -l' for the list of already
# built-in (statically linked and thus always available) modules in your Apache
# binary.
#
# Note: The order in which modules are loaded is important.  Don't change
# the order below without expert advice.
#
#LoadModule anon_auth_module modules/mod_auth_anon.so
#LoadModule dbm_auth_module modules/mod_auth_dbm.so
#LoadModule digest_auth_module modules/mod_auth_digest.so
#LoadModule cern_meta_module modules/mod_cern_meta.so
#LoadModule digest_module modules/mod_digest.so
#LoadModule expires_module modules/mod_expires.so
#LoadModule headers_module modules/mod_headers.so
#LoadModule proxy_module modules/mod_proxy.so
LoadModule rewrite_module modules/mod_rewrite.so
#LoadModule speling_module modules/mod_speling.so
#LoadModule info_module modules/mod_info.so
#LoadModule status_module modules/mod_status.so
#LoadModule usertrack_module modules/mod_usertrack.so

#
# Use name-based virtual hosting.
#
NameVirtualHost 192.168.0.54

#
# VirtualHost example:
# Almost any Apache directive may go into a VirtualHost container.
# The first VirtualHost section is used for requests without a known
# server name.
#
#<VirtualHost *>
#    ServerAdmin webmaster@dummy-host.example.com
#    DocumentRoot /www/docs/dummy-host.example.com
#    ServerName dummy-host.example.com
#    ErrorLog logs/dummy-host.example.com-error_log
#    CustomLog logs/dummy-host.example.com-access_log common
#</VirtualHost>
#

<VirtualHost silvana2.quadrante.com>
    ServerAdmin abottoni@quadrante.com
    DocumentRoot "C:/Apache/htdocs"
    ServerName silvana2.quadrante.com
</VirtualHost>

<VirtualHost ezpublish.quadrante.com>
    ServerName ezpublish.quadrante.com
    DocumentRoot "C:/Apache/htdocs/ezpublish"
    <Directory "C:/Apache/htdocs/ezpublish">
      Options FollowSymLinks Indexes ExecCGI
      AllowOverride None
    </Directory>
    RewriteEngine On
    RewriteLog rewrite_user.log
    RewriteLogLevel 9
    RewriteRule ^/stats/store/(.*).gif$ /ezstats/user/storestats.php [S=2]
    # The lines above should appear on the same line in your configuration file!
    RewriteRule ^/filemanager/filedownload/([^/]+)/(.*)$ /ezfilemanager/files/$1 [T="application/oct-stream",S=1]
    # The lines above should appear on the same line in your configuration file!
    RewriteRule !\.(gif|css|jpg|png)$ /index.php
    ServerAdmin abottoni@quadrante.com
</VirtualHost>

<VirtualHost ezadmin.quadrante.com>
   ServerAdmin abottoni@quadrante.com
   DocumentRoot "C:/Apache/htdocs/ezpublish"
   <Directory "C:/Apache/htdocs/ezpublish">
     Options FollowSymLinks Indexes ExecCGI
     AllowOverride None
   </Directory>
   ServerName ezadmin.quadrante.com
   RewriteEngine On
   RewriteLog rewrite_admin.log
   RewriteLogLevel 9
   RewriteRule !\.(gif|css|jpg|png)$ /index_admin.php
</VirtualHost>
-------------------------------------------------

and this is the relevant part of my hosts file: 
-------------------------------------------------
127.0.0.1       localhost
192.168.0.217     jader.quadrante.com
192.168.0.54	silvana2.quadrante.com
192.168.0.54	silvana2
192.168.0.54	ezpublish.quadrante.com
192.168.0.54	ezpublish
192.168.0.54	ezadmin.quadrante.com
192.168.0.54	ezadmin
------------------------------------------
>Fix:
I did not find any workaround until now.
>Release-Note:
>Audit-Trail:
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