机器卡死，强制启动出现：
generating “/run/initramfs/rdsosreport.txt”
entering emergencymode. exit the shell to continue
type “journalctl” to view system logs.
you might want to save “/run/initramfs/rdsosreport.txt” to a usb stick or /boot after mounting them and attach it to a bug report。
解决办法：
xfs_repair /dev/mapper/centos-root -L然后重启