[Bug 278979] CARP not working on 14.0-RELEASE on VMware

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278979

            Bug ID: 278979
           Summary: CARP not working on 14.0-RELEASE on VMware
           Product: Base System
           Version: 14.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: tburns@hrsd.com

After upgrading from from 13.2 to 14.0, CARP stopped working as expected. For
one, no matter what I do with manually setting the state or adjusting the
advskew, it doesn't work as expected. The same with the preempt kernel
parameter. I have tried both unicast and multicast peer settings.

Here are the configs:

host1 $ ifconfig | grep 'vhid 10'
    inet 172.21.4.170 netmask 0xffffffff broadcast 172.21.4.170 vhid 10
    carp: MASTER vhid 10 advbase 1 advskew 50
host1 $ grep 'vhid 10' /etc/rc.conf
ifconfig_vmx0_alias10="inet vhid 10 advskew 50 pass redacted alias
172.21.4.170/32"
host1 $

$ export PS1='host2 $ '
host2 $ export PS1='host2 $ '^C
host2 $ ifconfig | grep 'vhid 10'
    inet 172.21.4.170 netmask 0xffffffff broadcast 172.21.4.170 vhid 10
    carp: MASTER vhid 10 advbase 1 advskew 100
host2 $ grep 'vhid 10' /etc/rc.conf
ifconfig_vmx0_alias10="inet vhid 10 advskew 100 pass redacted alias
172.21.4.170/32"
host2 $

host1 $ cat /etc/sysctl.conf
net.inet.carp.allow=1
net.inet.carp.preempt=1
net.inet.carp.log=1

Nothing has changed other than the OS version. I verified the hypervisor
environment by making sure two 13.2 hosts with identical configs except their
IPs work on the same vSwitch and the same ESXi hosts. I also tried changing the
NIC type from VMXNET3 (vmx driver) to intel (em driver) with the same results.

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