网站介绍：umount失败# fuser -mk /opt973 974 1013 1014 1075# umount /optumount: can't unmount /opt: Device or resource busy常规umount失败后有3种处理方法：fuser,lsof,和umount -l这几个方法都试过，仍然失败，umount -l实际上骗人的，df虽然显示已经卸载..._can't unmount
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