NFS 官網的 D12 描述的解法如下:
Sometimes it can at a couple of interations of the "kill processes" then "umount -f" cycle until the filesystem is unmounted, but it usually works.
If all else fails, you can still unmount the partition on which the processes are hanging using the "umount -l" command. This causes the stuck mount to become detached from the file system name space hierarchy on your client, and will thus no longer be visible to other processes結論是: 重覆 kill、umount -f、mount 多次應該會有效。再不行的話, 改試看看 umount -l。我自己試的時候是 「umount -l, mount, kill (失敗), umount -f」 結果就好了。
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