[Bug 227654] [panic] repeatable crash with IPv6+lagg+vlan+em

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227654

            Bug ID: 227654
           Summary: [panic] repeatable crash with IPv6+lagg+vlan+em
           Product: Base System
           Version: 11.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Keywords: crash
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: net at FreeBSD.org
          Reporter: eugen at freebsd.org
                CC: stable at FreeBSD.org

Created attachment 192681
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=192681&action=edit
panic screenshot

Hi!

I run my workstation under FreeBSD 11.1-STABLE/amd64 r331249 with custom kernel
including IPv6 support, options DDB, KDB, INVARIANTS and WITNESS.

The following sequence of commands produces a panic reliably, including
cold-booted single user mode:

ifconfig tap0 create up
ifconfig lagg0 create up
ifconfig lagg0 laggport tap0
ifconfig em0 up
ifconfig vlan61 create vlan 61 vlandev em0
ifconfig vlan61 inet 192.168.0.1/24
ifconfig lagg0 laggport em0 # instant panic

Panic messages sometimes printed in bright-white and then system jumps to BIOS
POST within a second or so. Sometimes they are pronted in gray then system just
hangs solid without any reaction on Ctrl-Alt-ESC to enter KDB and no crashdump
generated.

Screenshot is attached.

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