[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

--- Comment #12 from Alexey <pautina at kharkiv.net> ---
I rolled back on the current server to revision r341831 and it did not help,
then I remembered that on the second server I used the drivers installed from
the ports (/usr/ports/net/intel-ix-kmod/).
Now when using these drivers - there are no problems and the physical interface
does not flap.
FreeBSD nas1 12.0-STABLE FreeBSD 12.0-STABLE r341831 NAS  amd64

Mar  1 13:38:29 nas1 ntpd[1127]: Listen normally on 8 vlan111 192.168.0.8:123
Mar  1 13:38:32 nas1 ntpd[1127]: Deleting interface #8 vlan111,
192.168.0.8#123, interface stats: received=0, sent=0, dropped=0, active_time=3
secs

[root at nas1 /home/pautina]#  cat /etc/rc.conf |egrep "vlan111|ix1"
cloned_interfaces="vlan111 vlan780"
ifconfig_ix1="up -tso4 -tso6 -lro -vlanhwtso description
-=INTERFACE-TO-APHRODITE="
ifconfig_vlan111="inet 192.168.0.8 netmask 255.255.255.224 vlan 111 vlandev ix1
description -=NAS-WORLD=-"
[root at nas1 /home/pautina]#

[root at nas1 /home/pautina]# ifconfig vlan111
vlan111: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        description: -=NAS-WORLD=-
        options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
        ether e4:11:5b:9b:72:b4
        inet 192.168.0.8 netmask 0xffffffe0 broadcast 192.168.0.31
        groups: vlan
        vlan: 111 vlanpcp: 0 parent interface: ix1
        media: Ethernet autoselect (10Gbase-Twinax <full-duplex>)
        status: active
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
[root at nas1 /home/pautina]#

[root at nas1 /home/pautina]# ifconfig ix1
ix1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        description: -=INTERFACE-TO-APHRODITE=
       
options=e000bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
        ether e4:11:5b:9b:72:b4
        media: Ethernet autoselect (10Gbase-Twinax <full-duplex>)
        status: active
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
[root at nas1 /home/pautina]#

[root at nas1 /home/pautina]# grep if_ix_updated /boot/loader.conf
if_ix_updated_load="YES"
[root at nas1 /home/pautina]#

[root at nas1 /home/pautina]# kldstat
Id Refs Address                Size Name
 1    9 0xffffffff80200000  12f04e0 kernel
 2    1 0xffffffff814f1000    562f0 if_ix_updated.ko
 3    1 0xffffffff81621000      acf mac_ntpd.ko
[root at nas1 /home/pautina]#

[root at nas1 /home/pautina]# dmesg |grep ix1
ix1: <Intel(R) PRO/10GbE PCI-Express Network Driver, Version - 3.3.6> port
0xe000-0xe01f mem 0xdf980000-0xdf9fffff,0xdfb00000-0xdfb03fff irq 17 at device
0.1 on pci2
ix1: Using MSI-X interrupts with 5 vectors
ix1: Ethernet address: e4:11:5b:9b:72:b4
ix1: PCI Express Bus: Speed 5.0GT/s Width x8
ix1: link state changed to UP
[root at nas1 /home/pautina]#

ix0 at pci0:2:0:0: class=0x020000 card=0x17d3103c chip=0x10fb8086 rev=0x01
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '82599ES 10-Gigabit SFI/SFP+ Network Connection'
    class      = network
    subclass   = ethernet
ix1 at pci0:2:0:1: class=0x020000 card=0x17d3103c chip=0x10fb8086 rev=0x01
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '82599ES 10-Gigabit SFI/SFP+ Network Connection'
    class      = network
    subclass   = ethernet

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