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Date:      Tue, 24 Mar 2020 00:29:05 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 245022] Problem with FreeBSD NLM interoperating with Netapp Filer after software upgrade
Message-ID:  <bug-245022-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D245022

            Bug ID: 245022
           Summary: Problem with FreeBSD NLM interoperating with Netapp
                    Filer after software upgrade
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: rmacklem@FreeBSD.org

Created attachment 212663
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D212663&action=
=3Dedit
create a tunable to set the NLM client to use TCP

After upgrading the software on a Netapp Filer, serious interoperability
problems were observed between the FreeBSD NLM client and Netapp server.
(The NLM protocol is a separate protocol from NFSv3 that provides file
 locking. Also known as rpc.lockd.)
Reported via email by Daniel Braniss (danny@cs.huji.ac.il).

Although the problem(s) were not completely diagnosed, it appeared to
be related to reuse of the xid in the RPC over UDP header.

Adam McDougall (mcdouga9@egr.msu.edu) mentioned resolving a similar
issue with the FreeBSD NLM->Netapp Filer by switching the NLM to use TCP
instead of UDP.

I have created this bug report to track this and have two simple patches
that might resolve (or make it easier to deal with) attached here.

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