Apache isn't booting on our production server (all of a sudden) and there are no error messages. Can anyone help me fix this or help me start debugging?

init.d fails:

/etc/init.d/httpd restart
Stopping httpd:                                            [FAILED]
Starting httpd:                                            [FAILED]

Configtest

Syntax OK

Apache:

Server version: Apache/2.2.3
Server built:   Nov 12 2012 08:48:46

Server:

CentOS release 5.8 (Final)

Booting with debug:

/usr/sbin/httpd -e debug -X
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module auth_basic_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module auth_digest_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module authn_file_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module authn_alias_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module authn_anon_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module authn_dbm_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module authn_default_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module authz_host_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module authz_user_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module authz_owner_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module authz_groupfile_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module authz_dbm_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module authz_default_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module ldap_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module authnz_ldap_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module include_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module log_config_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module logio_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module env_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module ext_filter_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module mime_magic_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module expires_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module deflate_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module headers_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module usertrack_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module setenvif_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module mime_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module dav_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module status_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module autoindex_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module info_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module dav_fs_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module vhost_alias_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module negotiation_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module dir_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module actions_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module speling_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module userdir_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module alias_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module rewrite_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module proxy_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module proxy_balancer_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module proxy_ftp_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module proxy_http_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module proxy_connect_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module cache_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module suexec_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module disk_cache_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module file_cache_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module mem_cache_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module cgi_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module version_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module ssl_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module perl_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module php5_module
[Sun Dec 16 20:10:16 2012] [debug] mod_so.c(246): loaded module proxy_ajp_module
<At this point it exits>

/var/log/httpd/error_log

[Sun Dec 16 20:10:16 2012] [notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Sun Dec 16 20:10:16 2012] [info] Init: Seeding PRNG with 256 bytes of entropy
[Sun Dec 16 20:10:16 2012] [info] Init: Generating temporary RSA private keys (512/1024 bits)
[Sun Dec 16 20:10:16 2012] [info] Init: Generating temporary DH parameters (512/1024 bits)
[Sun Dec 16 20:10:16 2012] [info] Init: Initializing (virtual) servers for SSL