centos重启报错Umounting file systems:umount:/opt:device is busy

系统重启报错：

Umounting file systems:umount:/opt:device is busy

只能硬关机，回想一下最近刚安装了nod32 for linux x64的杀毒软件，开启了文件系统监控，进入系统关闭文件防护即可