[Bug 214955] rpc.lockd sends spurious NLM_UNLOCKs

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214955

            Bug ID: 214955
           Summary: rpc.lockd sends spurious NLM_UNLOCKs
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: feld at FreeBSD.org
                CC: rmacklem at FreeBSD.org

Created attachment 177543
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=177543&action=edit
packet capture

We have encountered an issue reproducible on FreeBSD 10.3 with read-only NFS
mounts. FreeBSD is sending NLM_UNLOCKs when mounted read-only. This was
discovered because it triggers a bug in NetApp filers where it causes the file
to be truncated.

We can trigger this reliably when using clamscan to scan virus samples on a
readonly NFS mount.

Other FreeBSD versions have not been tested, but we did not believe this
happened in FreeBSD 9.3. I believe there was a lot of NFS related development
between 9.0 and 10.0, but I am not sure if this bug was introduced because of
those changes.

Attached is a pcap showing UNLOCKs sent.

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