root@server:~# qm stop 121#尝试停止该虚拟机，但报错，错误提示如下
trying to acquire lock...
can't lock file '/var/lock/qemu-server/lock-121.conf' - got timeout
root@server:~# qm unlock 121#尝试解锁该虚拟机，但故障依旧
trying to acquire lock...
can't lock file '/var/lock/qemu-server/lock-121.conf' - got timeout
root@server:~# rm -rf /var/lock/qemu-server/lock-121.conf #删除锁定文件
root@server:~# qm stop 121#在次尝试强制关闭虚拟机，发现问题解决了
root@server:~#