[Bug 285967] [hyper-v] Changing hn MTU causes on freeze on Azure D4ds_v6 (and other v6) instances

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=285967

--- Comment #2 from Evans Chen <evans.c@dell.com> ---
I should also mention that the sysctl was from a different system, hence it
being hn.1 instead of hn.0, but here is the commands that I used to get around
the ifconfig command hang to print it out:

# sysctl dev.hn.1.channel.12.br.tx.state
# python -c "import subprocess; subprocess.Popen(['ifconfig', 'hn1', 'mtu',
'1520', 'up']); exit()"
# sysctl dev.hn.1.channel.12.br.tx.state

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