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: b...@freebsd.org
Reporter: asom...@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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