[Bug 236102] When create or destroy vlan, the physical interface is flapping

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236102

            Bug ID: 236102
           Summary: When create or destroy vlan, the physical interface is
                    flapping
           Product: Base System
           Version: 12.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: pautina at kharkiv.net

I add some configuretion on rc.conf

[root at nas1 /home]# cat /etc/rc.conf |egrep "vlan111|ix0"
cloned_interfaces="vlan111 vlan780"
#ifconfig_ix0="up -tso4 -tso6 -lro -vlanhwtso description
-=INTERFACE-TO-HERMES=-"
ifconfig_ix0="up -tso4 -tso6 -lro -vlanhwtso description
-=INTERFACE-TO-HERMES=-"
ifconfig_vlan111="inet 192.168.0.8 netmask 255.255.255.224 vlan 111 vlandev ix0
description -=NAS-WORLD=-"
[root at nas1 /home]#

then do some commands:

ifconfig vlan111 create

Feb 28 12:05:34 nas1 kernel: ix0: link state changed to DOWN
Feb 28 12:05:34 nas1 kernel: vlan111: link state changed to DOWN
Feb 28 12:05:35 nas1 ntpd[1049]: Listen normally on 8 vlan111 192.168.0.8:123
Feb 28 12:05:36 nas1 kernel: ix0: link state changed to UP
Feb 28 12:05:36 nas1 kernel: vlan111: link state changed to UP

after this physical interface is flapping
when I doo:

ifconfig vlan111 destroy
physical interface also is flapping

Feb 28 12:05:57 nas1 kernel: ix0: link state changed to DOWN
Feb 28 12:05:58 nas1 ntpd[1049]: Deleting interface #8 vlan111,
192.168.0.8#123, interface stats: received=0, sent=0, dropped=0, active_time=23
secs
Feb 28 12:06:00 nas1 kernel: ix0: link state changed to UP

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