[Bug 261291] ESX NFS4.1 client hangs, server never responds to EXCHANGE_ID/CREATE_SESSION

From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 18 Jan 2022 00:40:10 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261291

            Bug ID: 261291
           Summary: ESX NFS4.1 client hangs, server never responds to
                    EXCHANGE_ID/CREATE_SESSION
           Product: Base System
           Version: 13.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: asomers@FreeBSD.org

About once per week a VMWare ESX client hangs on its NFS 4.1 mount from my
FreeBSD server, which is running a build based on stable/13 at 5dc6fedeb40
(16-Sep-2021).  I have a packet trace from the last time I observed the
problem.  It shows normal NFS traffic culminating with a successful FSSTAT
operation.  Then, the client sends alternating EXCHANGE_ID and CREATE_SESSION
operations, but the server never replies.  It does send TCP ACKs, but there is
no NFS-level response.  It does continue to service other clients normally.

I am unsure how to debug this further, but I can probably conduct any
experiment you suggest.  I can also provide the pcap files if necessary.

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