kernel panic by enabling net.inet.ip.random_id

Hey All,

Here's a kernel panic I'm experiencing by enabling net.inet.ip.random_id
at boot.

I'm on latest HEAD on amd64 in bhyve. I'll soon-ish be testing on native
hardware with VIMAGE enabled.

=== Begin Log ===
Kernel page fault with the following non-sleepable locks held:
exclusive sleep mutex ip_id_mtx (ip_id_mtx) r = 0 (0xffffffff81c54830) locked _at_ /usr/src/sys/netinet/ip_id.c:227
stack backtrace:
#0 0xffffffff80a79620 at witness_debugger+0x70
#1 0xffffffff80a7a937 at witness_warn+0x3d7
#2 0xffffffff80e6b887 at trap_pfault+0x57
#3 0xffffffff80e6b15f at trap+0x4bf
#4 0xffffffff80e4af97 at calltrap+0x8
#5 0xffffffff80b6c41b at ip_output+0x16b
#6 0xffffffff80b68e82 at icmp_reflect+0x5b2
#7 0xffffffff80b6883f at icmp_error+0x46f
#8 0xffffffff80beeb12 at udp_input+0x982
#9 0xffffffff80b69d1d at ip_input+0x17d
#10 0xffffffff80b08ba1 at netisr_dispatch_src+0x81
#11 0xffffffff80afecce at ether_demux+0x15e
#12 0xffffffff80affa14 at ether_nh_input+0x344
#13 0xffffffff80b08ba1 at netisr_dispatch_src+0x81
#14 0xffffffff80afefcf at ether_input+0x4f
#15 0xffffffff8089a5c3 at vtnet_rxq_eof+0x823
#16 0xffffffff8089b2ce at vtnet_rx_vq_intr+0x4e
#17 0xffffffff809e9ba6 at intr_event_execute_handlers+0x96


Fatal trap 12: page fault while in kernel mode
cpuid = 6; apic id = 06
fault virtual address   = 0x5bd
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff80b5de9e
stack pointer           = 0x28:0xfffffe02b8d483e0
frame pointer           = 0x28:0xfffffe02b8d48410
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 (irq265: virtio_pci0)
[ thread pid 12 tid 100040 ]
Stopped at      ip_fillid+0x8e: movzbl  (%rax,%rcx,1),%esi
=== End Log ===

Thanks,

-- 
Shawn Webb
HardenedBSD

GPG Key ID:          0x6A84658F52456EEE
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