[Bug 255083] NFS Stale

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255083

            Bug ID: 255083
           Summary: NFS Stale
           Product: Base System
           Version: 13.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs at FreeBSD.org
          Reporter: fabio.pratelli at unipi.it

Hardware platform:
Supermicro X9DRD-7LN4F(-JBOD)/X9DRD-EF - 2x CPU E5-2630 v2 - 128 GB ram

O.S.
FreeBSD 13.0 either updated from 12.2-p6 or installed from scratch.

services:
zfs pool exported via nfs

Description of the scenario:

Mounting from an updated CentOS 7.9 and testing with fio, results the fio
process stalling. Not only fio, the entire nfs mount stalls.

Same test, on the same source and target hardrware, but using FreeBSD 12.2-p6
on target results in normal behaviour, tests end without problems as expected.

The network environment, nic and switches, are the same.

The problem is 100% replicable.

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