[Bug 240825] Vlan interfaces does not work on lagg from em0, em1

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240825

            Bug ID: 240825
           Summary: Vlan interfaces does not work on lagg from em0, em1
           Product: Base System
           Version: 12.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: yar at shvets.name

Created attachment 207816
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=207816&action=edit
network configuration in rc.conf

After upgrading from 11.3-RELEASE-p3 to 12.0-RELEASE-p10 vlan-interfaces on
lagg0 (em0, em1) stopped working.
Vlan interfaces look like working but not working.
Network configuration is: em0 and em1 aggregated to lagg0. Based on lagg0
created vlan-interfaces.
On the other end is a cisco switch (port channel from two ethernet ports, the
mode is LACP).

The network configuration worked on 9.x-releng, 10.x-releng, 11.2-releng,
11.3-releng.
And does not work on 12.0-releng, 12-stable, 12.1-PRERELEASE.
The lagg0 interface works. But does not work vlans on lagg0.
Looks like that untagged ethernet frames passed from/to lagg0, but tagged
ethernet frames not passed.

After downgrading to 11.3-releng vlans on lagg0 works again.

Kernel of the system based on GENERIC, i.e "device vlan" is in the kernel
configuration.

See rc.conf, console.log in attachment.

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