grub里面改了密码也没用，于是关闭quiet开启日志，结果发现/etc/passwd被selinux拦截了，于是去/etc/selinux/config里面关闭即可。类似这样的错误：
audit(1733934483.186:122):avc: denied { open } for pid=814 comme=“dbus-dae
mon=”/etc/passwd" dev="dm-0"ino=20088836 scontext=system_u:system r:system_dbusd_t:s0-s0:c1023 tcontext=system_u:object _r:unlabeled_t:s0 tclass=file permissive=8
$ ls -Z /etc/passwd
system_u:object_r:passwd_file_t:s0 /etc/passwd
结果变成他变成system_u:object_r:unlabeled_t:s0 /etc/passwd，ext4扩展属性出现问题