IPv6 (6rd or 6to4) kernel panic

[ddggttff3]

Hello,

I am trying to get IPv6 going on 2.4 Alpha, but as soon as I enable 6rd or 6to4 from the Web GUI, my PfSense instance crashes and continues to boot loop & crash. To get the system stable, I have to boot into single user and remove the PfSense config. If it helps, my instance is setup in a KVM VM using VirtIO for networking and has hardware checksum disabled.

I had the crash uploaded via the GUI (required /conf/config.xml to be deleted to get the instance booting again), but below you can find a copy of the information:

                    Crash report begins.  Anonymous machine information:

amd64
11.0-RELEASE-p3
FreeBSD 11.0-RELEASE-p3 #202 a48eb0f(RELENG_2_4): Thu Nov 24 06:48:34 CST 2016     root@buildbot2.netgate.com:/builder/ce/tmp/obj/builder/ce/tmp/FreeBSD-src/sys/pfSense

Crash report details:

Filename: /var/crash/bounds
1

Filename: /var/crash/info.0
Dump header from device: /dev/gptid/65886df7-b2f1-11e6-9c1c-1f8d055955cb
  Architecture: amd64
  Architecture Version: 1
  Dump Length: 157184
  Blocksize: 512
  Dumptime: Fri Nov 25 10:25:31 2016
  Hostname: pfSense.localdomain
  Magic: FreeBSD Text Dump
  Version String: FreeBSD 11.0-RELEASE-p3 #202 a48eb0f(RELENG_2_4): Thu Nov 24 06:48:34 CST 2016
    root@buildbot2.netgate.com:/builder/ce/tmp/obj/builder/ce/tmp/FreeBSD-src/sys/pfSense
  Panic String: double fault
  Dump Parity: 2304334970
  Bounds: 0
  Dump Status: good

Filename: /var/crash/info.last
Dump header from device: /dev/gptid/65886df7-b2f1-11e6-9c1c-1f8d055955cb
  Architecture: amd64
  Architecture Version: 1
  Dump Length: 157184
  Blocksize: 512
  Dumptime: Fri Nov 25 10:25:31 2016
  Hostname: pfSense.localdomain
  Magic: FreeBSD Text Dump
  Version String: FreeBSD 11.0-RELEASE-p3 #202 a48eb0f(RELENG_2_4): Thu Nov 24 06:48:34 CST 2016
    root@buildbot2.netgate.com:/builder/ce/tmp/obj/builder/ce/tmp/FreeBSD-src/sys/pfSense
  Panic String: double fault
  Dump Parity: 2304334970
  Bounds: 0
  Dump Status: good

Full dump is at http://pastebin.com/5GkSzAPL