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deleted 9 characters in body; edited tags; edited title

edited Oct 12, 2014 at 10:16

umount: device is busy. Why isn't my NFS partition unmounting?

When running umount /path I get:

umount: /path: device is busy.

The filesystem is huge, so lsof +D /path is not a realistic option.

lsof /path, lsof +f -- /path, and fuser /path all return nothing. fuser -v /path gives:

 USER PID ACCESS COMMAND /path: root kernel mount /path

which is normal for all unused mounted file systems.

umount -l and umount -f is not good enough for my situation.

How do I figure out why the kernel thinks this filesystem is busy?

asked Jun 15, 2011 at 11:41