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

From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 27 Jan 2022 22:43:30 UTC

--- Comment #8 from Rick Macklem <rmacklem@FreeBSD.org> ---
When I looked at the packet trace, I noted where the problem
occurred, which was long before the ExchangeID repeats.
(I think the client is somehow trying to recover, but in a
 weird way.)

In the packet trace, there was no reply to the request in
packet #644. It is a packet with two compounds in it, but
Linux does that to the server without any problems, from time
to time.

If there is no "stuck" TCP connection and no hung nfsd threads,
then hmm... I'll take another look at the packet trace (I think
I still have it), focusing on the session (sequence ops) around
where the request does not get a reply.
--> Is it possible for your server's net interface to drop a reply
    such that it doesn't show up in the packet trace?
--> Did you try disabling TSO, which is the most common breakage for
    net interfaces and their device drivers.

Actually, the fact that there is no non-zero RecvQ is good news, since
that indicates that the PR256280 breakage isn't still broken.

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