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Subject[bug?] can't unmount filesystem after running "exportfs -u" -- dangling refcount?

I'm seeing some odd behaviour on an NFS server.

We're running 3.4.82 and have a drbd-replicated filesystem
(active/standby) that is exported via NFS (explicitly v3, and
/proc/fs/nfsd is mounted).

On a server switchover we take down the NFS server IP address, run
"exportfs -u" on the exports, unmount the drbd filesystem, and then
demote drbd from primary to secondary.

The problem we're seeing is that sometimes "exportfs -u" completes
successfully but "umount" fails with an error that the filesystem is
busy. When this happens, "fuser" doesn't see any userspace users, which
points at the kernel thinking it has a reference open.

When it's in the stuck state, manually running "exportfs -f" seems to
resolve the issue so that "unmount" can run.

Are there any known issue in this area?

I'm not currently subscribed to the list, so please CC me on replies.

Thanks,
Chris


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