[Bug 220867] Double loading of the if_tap module causes the system to crash, without panic and reboot

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220867

            Bug ID: 220867
           Summary: Double loading of the if_tap module causes the system
                    to crash, without panic and reboot
           Product: Base System
           Version: 11.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: admin at support.od.ua

Created attachment 184517
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=184517&action=edit
Screenshot of the screen at the moment of crash

Double loading of the if_tap module causes the system to crash, without panic
and reboot

I have FreeBSD system:
# uname -a
FreeBSD core.domain.com 11.1-PRERELEASE FreeBSD 11.1-PRERELEASE #0 r318606: Mon
May 22 14:28:27 EEST 2017    
root at core.domain.com:/usr/obj/usr/src/sys/core.domain.com.1  amd64

The if_tap module is compiled into the kernel

If you add to /boot/loader.conf:
If_tap_load = "YES"

And reboot system, then I get a crash system, without panic and reboot

# kldstat -v | grep if_tap
                330 if_tap

# kldstat
Id Refs Address            Size     Name
 1   15 0xffffffff80200000 13b1b00  kernel
 2    1 0xffffffff815b3000 303178   zfs.ko
 3    2 0xffffffff818b7000 aab0     opensolaris.ko
 4    1 0xffffffff818c2000 29f0     nmdm.ko
 5    1 0xffffffff818c5000 3552e0   vmm.ko

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