linux无法登陆，显示module is unknown

1.进入救援模式

http://www.linuxidc.com/Linux/2015-03/114942.htm

2.查看log

cat /var/log/security

---

PAM [error: /lib/security/pam_limits.so: wrong ELF class: ELFCLASS32]

3.修改/etc/pam.d/login

session required /lib/security/pam_limits.so

改为

session required /lib64/security/pam_limits.so

来源张永光的博客