SecChrootDir -> Premature end of script headers

Hello there,
I've got some Problems but at first some Informations:

Operating System:
Linux debian 2.4.27 #3 SMP Fri Oct 22 13:50:24 CEST 2004 i686 GNU/Linux

Server version: Apache/2.0.53
Server built: Feb 25 2005 08:29:30
Server's Module Magic Number: 20020903:9
Architecture: 32-bit
Server compiled with....
-D APACHE_MPM_DIR="server/mpm/worker"
-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_SCOREBOARD="logs/apache_runtime_status"
-D DEFAULT_ERRORLOG="logs/error_log"
-D AP_TYPES_CONFIG_FILE="/etc/apache2/mime.types"
-D SERVER_CONFIG_FILE="/etc/apache2/apache2.conf"

Compiled in modules:
core.c
mod_access.c
mod_auth.c
mod_log_config.c
mod_logio.c
mod_env.c
mod_setenvif.c
worker.c
http_core.c
mod_mime.c
mod_status.c
mod_autoindex.c
mod_negotiation.c
mod_dir.c
mod_alias.c
mod_so.c

My mod_security:
debian:/etc/apache2/mods-enabled# apt-cache show libapache2-mod-security
Package: libapache2-mod-security
Priority: optional
Section: web
Installed-Size: 128
Maintainer: Bruno Rodrigues
Architecture: i386
Source: libapache-mod-security
Version: 1.8.4-1.1
Depends: mod-security-common (= 1.8.4-1.1), apache2-common, libc6
(>=
2.3.2.ds1-4)
Filename:
pool/main/liba/libapache-mod-security/libapache2-mod-security_1.8.4-1.1_i386.deb
Size: 32874
MD5sum: e8dba8ed671ab0e8346aeef1619a1a0e
Description: Tighten the Web application security for Apache 2.x

Apache error log:
[Sat Mar 05 21:23:31 2005] [notice] mod_security: chroot checkpoint #1
(pid=7334 ppid=7332)
[Sat Mar 05 21:23:31 2005] [notice] mod_security: chroot checkpoint #2
(pid=7335 ppid=1)
[Sat Mar 05 21:23:31 2005] [notice] mod_security: chroot successful,
path=/chroot/apache
[Sat Mar 05 21:23:31 2005] [notice] Apache/2.0.53 (Debian GNU/Linux)
proxy_html/2.4 mod_perl/1.999.20 Perl/v5.8.4 configured -- resuming normal
operations
[Sat Mar 05 21:23:31 2005] [info] Server built: Feb 25 2005 08:29:30
[Sat Mar 05 21:23:31 2005]
[debug]
/home/adconrad/apache2/apache2-2.0.53/build-tree/apache2/server/mpm/worker/worker.c(1632):
AcceptMutex: sysvsem (default: sysvsem)
[Sat Mar 05 21:24:00 2005] [error] [client xxx] Premature end of script
headers: index.php

mod_security Debug log:
[05/Mar/2005:21:24:00 +0100] [xxx/sid#81afd70][rid#83dff70][/index.php]
sec_check_access, path=(null)
[05/Mar/2005:21:24:00 +0100] [xxx/sid#81afd70][rid#83dff70][/index.php]
Filtering off, switched off for path "(null)"
[05/Mar/2005:21:24:00 +0100] [xxx/sid#81afd70][rid#83dff70][/index.php]
Filtering off, switched off for path "(null)"
[05/Mar/2005:21:24:00 +0100] [xxx/sid#81afd70][rid#83dff70][/index.php]
find_last_request: start with 83dff70 "/index.php"
[05/Mar/2005:21:24:00 +0100] [xxx/sid#81afd70][rid#83dff70][/index.php]
sec_logger: start
[05/Mar/2005:21:24:00 +0100] [xxx/sid#81afd70][rid#83dff70][/index.php]
Audit log off here

There are no informations in the php log file.

System description:
Apache is used for normal Website Providing. Users could access their
Webspaces during FTP and upload HTML Sites, PHP and CGI Script, so that
their Pages are provided to the www. A mysql Server is also running.
PHP is configured to run as CGI with suPHP. This is provided by the
mod_suphp for apache.
I tried to configure Apache to run with mod_security and its SecChrootDir
Directive. But there must be the error. Either in mod_security or in
mod_suphp.
When I access a simple PHP Script, with the phpinfo() function I got the
following error in the apache log:

[Sat Mar 05 21:24:00 2005] [error] [client xxx] Premature end of script
headers: index.php

And a 500 Internal Server Error at the Browser.

Please help me, I don't know what I could do...

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