umount -a -f -t nfs doesn't work when a file has been written and "-l" option is needed

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I suffer the following problem with nfs since a lot of time, now, I am
using nfs-utils-1.2.0, but older versions were affected too.

When I write a file on a mounted nfs filesystem and server goes down, I
am unable to umount it even with "-f" option, it simply hangs. On the
other hand, if no file was written (for example, it was simply read)
there is no problem and "umount -f" works as expected.

Seems that I need to run "umount -l" for being able to unmount it, even
when I expected that "-f" should be enough.

Is this the proper behavior or something is going wrong?

Thanks a lot :-)

 

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