Description:
------------
I have a recent installation of Ubuntu 6.10 + std ubuntu packages (like Apache2 + PHP5 (5.1.6)).

I installed APC 3.0.12p2 to this as per directions, and it seems to work.  But I frequently get HTTP requests 
being processed by the wrong script.  For instance, a request for "page_A.php" can return the results of "page_B.php".

In this case, APC (via apc_cache_info()) shows a cache hit on "page_B.php", when "page_A.php" should have been hit.  "page_B.php" traces the output of :

$_SERVER['REQUEST_URI']

and it shows "page_A.php".

It appears that I'm seeing the effects of mismatched fetches from the cache list.  The URI is correct, but the wrong script is invoked.

The problem occurs frequently (maybe 1 in 5 pages), but not consistently.  It seems to effect just one pair of pages (mixes just these two with each other).  The affected pair can change when I restart apache.  I cannot characterize it farther.  Of course, simply disabling APC avoids the problem.


System Setup:
=============

- ubuntu 6.10 installation
- std ubuntu install of Apache2 and PHP5 packages (i did not compile)
- APC 3.0.12p2 installed as per instructions


apache :
========


# apache2 -V
Server version: Apache/2.0.55
Server built:   Sep 27 2006 16:52:14
Server's Module Magic Number: 20020903:11
Architecture:   32-bit
Server compiled with....
 -D APACHE_MPM_DIR="server/mpm/prefork"
 -D APR_HAS_SENDFILE
 -D APR_HAS_MMAP
 -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
 -D APR_USE_SYSVSEM_SERIALIZE
 -D APR_USE_PTHREAD_SERIALIZE
 -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
 -D APR_HAS_OTHER_CHILD
 -D AP_HAVE_RELIABLE_PIPED_LOGS
 -D HTTPD_ROOT=""
 -D SUEXEC_BIN="/usr/lib/apache2/suexec2"
 -D DEFAULT_PIDLOG="/var/run/apache2.pid"
 -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
 -D DEFAULT_LOCKFILE="/var/run/apache2/accept.lock"
 -D DEFAULT_ERRORLOG="logs/error_log"
 -D AP_TYPES_CONFIG_FILE="/etc/apache2/mime.types"
 -D SERVER_CONFIG_FILE="/etc/apache2/apache2.conf"



php.ini settings (that i changed) :
===================================

  track_errors = On
  display_errors = On
  magic_quotes_gpc = Off
  error_reporting  =  E_ALL
  always_populate_raw_post_data = On
  allow_call_time_pass_reference = On

  extension=mhash.so
  extension=mysql.so
  extension=mysqli.so
  extension=json.so
  extension=mcrypt.so
  extension=apc.so

  ; APC settings
  apc.enabled=1
  apc.shm_segments=1
  apc.optimization=0
  apc.shm_size=30
  apc.ttl=7200
  apc.user_ttl=7200
  apc.num_files_hint=1200
  apc.mmap_file_mask=/tmp/apc.XXXXXX
  apc.enable_cli=1



other :
=======

- Web site configured in apache as a virtual host
- there are simple mod_rewrite rules, but these don't match in many cases (so I suspect has no effect)