More CARP issues under 12

[Pete French]

so, having got a workaround for yesterdays problems, I now went to upgrade my
other pair of boxes using CARP. No 'pf' on these, just one shared address.
This is the setup I have tested in development and it works fine.

I install the new kenel and do the first reboot - and I get the panic
below. Maybe its not carp related, but seems suspicious as the last
thing it spits out is a carp message.

Note this is the first reboot - so 12.0 kernel with the 11 userland, in
perparation for the installworld step. Machine is booting from, ZFS and also
has a GELI partition contain some data which requires a manual password.



Setting hostuuid: 49434d53-0200-9031-2500-31902500d9bf.
Setting hostid: 0xf41a3f2e.
Starting file system checks:
Mounting local filesystems:.
ELF ldconfig path: /lib /usr/lib /usr/lib/compat /usr/local/lib
32-bit compatibility ldconfig path: /usr/lib32
Setting hostname: serpentine-passive.telehouse-internal.ingresso.co.uk.
Setting up harvesting: PURE_RDRAND,[UMA],[FS_ATIME],SWI,INTERRUPT,NET_NG,NET_ETHER,NET_TUN,MOUSE,KEYBOARD,ATTACH,CACHED
Feeding entropy: .
lo0: link state changed to UP
em0: promiscuous mode enabled
carp: demoted by 240 to 240 (interface down)


Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x28
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff80ca0de1
stack pointer           = 0x28:0xfffffe00004da740
frame pointer           = 0x28:0xfffffe00004da760
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 12 (swi4: clock (0))
trap number             = 12
panic: page fault
cpuid = 0
time = 1547727391
KDB: stack backtrace:
#0 0xffffffff80be8597 at kdb_backtrace+0x67
#1 0xffffffff80b9ccf3 at vpanic+0x1a3
#2 0xffffffff80b9cb43 at panic+0x43
#3 0xffffffff8107382f at trap_fatal+0x35f
#4 0xffffffff81073889 at trap_pfault+0x49
#5 0xffffffff81072eae at trap+0x29e
#6 0xffffffff8104e1a5 at calltrap+0x8
#7 0xffffffff80ca0ce6 at ether_output+0x6b6
#8 0xffffffff80d0bda4 at arprequest+0x4c4
#9 0xffffffff80d0d9fc at garp_rexmit+0xbc
#10 0xffffffff80bb6ba9 at softclock_call_cc+0x129
#11 0xffffffff80bb7089 at softclock+0x79
#12 0xffffffff80b60e79 at ithread_loop+0x169
#13 0xffffffff80b5e012 at fork_exit+0x82
#14 0xffffffff8104f18e at fork_trampoline+0xe
Uptime: 19s