httpd 作为上下文运行 unconfined_u:system_r:httpd_t:s0（SELinux 处于许可状态）

我在开始时遇到问题httpd：

# service httpd status
httpd is stopped
# service httpd start
Starting httpd: [Tue Nov 01 12:02:53 2016] [notice] SELinux policy enabled; httpd running as context unconfined_u:system_r:httpd_t:s0
                                                           [FAILED]
# tail /var/log/httpd/error_log
[Tue Nov 01 12:59:57 2016] [notice] SELinux policy enabled; httpd running as context unconfined_u:system_r:httpd_t:s0
[Tue Nov 01 13:00:11 2016] [notice] SELinux policy enabled; httpd running as context unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
[Tue Nov 01 13:00:11 2016] [info] Init: Initialized OpenSSL library
[Tue Nov 01 13:00:49 2016] [notice] SELinux policy enabled; httpd running as context unconfined_u:system_r:httpd_t:s0
[Tue Nov 01 13:05:15 2016] [notice] SELinux policy enabled; httpd running as context unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
[Tue Nov 01 13:05:15 2016] [info] Init: Initialized OpenSSL library
[Tue Nov 01 14:38:56 2016] [notice] SELinux policy enabled; httpd running as context system_u:system_r:httpd_t:s0
[Tue Nov 01 14:40:38 2016] [notice] SELinux policy enabled; httpd running as context system_u:system_r:httpd_t:s0
[Tue Nov 01 14:59:55 2016] [notice] SELinux policy enabled; httpd running as context unconfined_u:system_r:httpd_t:s0
[Tue Nov 01 15:00:40 2016] [notice] SELinux policy enabled; httpd running as context system_u:system_r:httpd_t:s0
# cat /var/log/httpd/error_log | grep -v 'SELinux policy enabled'
[Tue Nov 01 12:30:07 2016] [info] Init: Initialized OpenSSL library
[Tue Nov 01 12:30:52 2016] [info] Init: Initialized OpenSSL library
[Tue Nov 01 12:31:17 2016] [info] Init: Initialized OpenSSL library
[Tue Nov 01 12:31:35 2016] [info] Init: Initialized OpenSSL library
[Tue Nov 01 12:31:43 2016] [info] Init: Initialized OpenSSL library
[Tue Nov 01 12:32:10 2016] [info] Init: Initialized OpenSSL library
[Tue Nov 01 12:38:22 2016] [info] Init: Initialized OpenSSL library
[Tue Nov 01 13:00:11 2016] [info] Init: Initialized OpenSSL library
[Tue Nov 01 13:05:15 2016] [info] Init: Initialized OpenSSL library
# getenforce 
Permissive
# httpd -t
Syntax OK
# httpd -e debug -k start
[Tue Nov 01 12:32:10 2016] [debug] mod_so.c(246): loaded module authz_host_module
[Tue Nov 01 12:32:10 2016] [debug] mod_so.c(246): loaded module log_config_module
[Tue Nov 01 12:32:10 2016] [debug] mod_so.c(246): loaded module setenvif_module
[Tue Nov 01 12:32:10 2016] [debug] mod_so.c(246): loaded module mime_module
[Tue Nov 01 12:32:10 2016] [debug] mod_so.c(246): loaded module autoindex_module
[Tue Nov 01 12:32:10 2016] [debug] mod_so.c(246): loaded module negotiation_module
[Tue Nov 01 12:32:10 2016] [debug] mod_so.c(246): loaded module dir_module
[Tue Nov 01 12:32:10 2016] [debug] mod_so.c(246): loaded module alias_module
[Tue Nov 01 12:32:10 2016] [debug] mod_so.c(246): loaded module rewrite_module
[Tue Nov 01 12:32:10 2016] [debug] mod_so.c(246): loaded module proxy_module
[Tue Nov 01 12:32:10 2016] [debug] mod_so.c(246): loaded module proxy_http_module
[Tue Nov 01 12:32:10 2016] [debug] mod_so.c(246): loaded module ssl_module
# echo $?
1
# run_init service httpd start
Authenticating root.
Password: 
Starting httpd:                                            [FAILED]
# 

我的环境：

# cat /etc/redhat-release 
Red Hat Enterprise Linux Server release 6.8 (Santiago)
# uname -a
Linux X 2.6.32-642.6.1.el6.x86_64 #1 SMP Thu Aug 25 12:42:19 EDT 2016 x86_64 x86_64 x86_64 GNU/Linux
# rpm -q httpd
httpd-2.2.15-54.el6_8.x86_64
#

请指教。