ntb_hw in use panic:

# kldload if_ntb
ntb: Cannot init transport: 22
kpanic @ time 1463015447.051, thread 0xfffff801c2b1a000: Fatal trap 9: general protection fault while in kernel mode

cpuid = 2
Panic occurred in module kernel loaded at 0xffffffff80200000:

Stack: --------------------------------------------------
kernel:trap_fatal+0xa2
kernel:trap+0x88a
kernel:ether_ifdetach+0x10
if_ntb.ko:ntb_handle_module_events+0x3e6
kernel:module_register_init+0xca
kernel:linker_load_module+0xbd9
kernel:kern_kldload+0x2ee
kernel:sys_kldload+0x5a
kernel:amd64_syscall+0x2f3
--------------------------------------------------
cpuid = 2; apic id = 02
instruction pointer     = 0x20:0xffffffff805b0970
stack pointer           = 0x28:0xfffffe99a8c78400
frame pointer           = 0x28:0xfffffe99a8c78420
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
Registers:
rax: deadc0dedeadc0de rbx: fffff801cb4cb800 rcx: 0000000000000080 rdx: 0000000000000000
rsi: 0000000000000001 rdi: fffff801cb4cb800 rbp: fffffe99a8c78420 rsp: fffffe99a8c78400
r8:  fffff801cb447380 r9:  0000000000000001 r10: fffff801c2b1a000 r11: 0000000000000001
r12: 0000000000000001 r13: fffff801c20a3340 r14: 0000000000000000 r15: 0000000000000016
rflags: 0000000000010286 rip: ffffffff805b0970 trapno: 0000000000000009 err: 0000000000000000
curthread: 0xfffff801c2b1a000
current process         = 2569 (kldload)
Stack Data from 0xfffffe99a8c78400:
 0: fffffe99a8c78410 0000000000000028 0000000000000016 fffff801c2aaf380 fffffe99a8c784a0 ffffffff83b5f3e7 ffffffff00000100 ffffffff83b61ef8
 8: fffff8010b3e7000 fffff801cb4cb800 00000b0000000000 fffff801c2aba800 0000000000000000 ffffffff808d30d4 fffffe99a8c784a0 fffff801c2aaf380
16: 0000000000000001 fffff801c20a3340 ffffffff83b61e90 0000000000000016 fffffe99a8c784d0 ffffffff804bd85b ffffffff83b617d8 ffffffff83b617d0
24: fffff801c23f6a00 fffff801c2aaf380 fffffe99a8c78820 ffffffff804b0c3a ffffffff00000008 fffff8015240fe00 0000000000000000 fffffe99a8c78580
32: fffff801c2b1a000 fffffe99a8c78848 0000000000000000 fffff801c20a3340 ffffffff80bb2a33 fffff801c2b1a000 0000000000000000 fffff8015240fe00
40: 0000000000000012 ffffffff80bb2a20 000001f0f89d1003 fffffe0f07635b64 0000000000000006 fffff801c21b4000 fffffe0f0762f000 ffffffff00000000
48: 0000000000000018 0000000100000000 0000000800641000 0000000000000000 fffffe99a8c78640 ffffffff808e00b4 0000000100000007 ffffffff810d4cd0
56: fffffe0ee9e0de80 ffffffff808e00b4 00000001e9e0e780 ffffffff810d4cd0 fffffe0ee9e0de80 0000000000000000 fffffe0ee9e0e000 ffffffff80934b02
Dumping stacks (40960 bytes)
Stacks dumped.
Dumping core.
Dumping 32642 MB (6 chunks)
 (10MB compressed; ratio: 4:1)dumping writable kmod segments.
 (20MB compressed; ratio: 4:1)
added 11617 referenced pages
dumping panic thread stack.
dumping pages according to priority:
dumping priority: ESSENTL [5]
 (30MB compressed; ratio: 11:1) (40MB compressed; ratio: 10:1) (50MB compressed; ratio: 9:1) (60MB compressed; ratio: 9:1) (70MB compressed; ratio: 9:1) (80MB compressed; ratio: 8:1) (90MB compressed; ratio: 8:1) (100MB compressed; ratio: 8:1) (110MB compressed; ratio: 8:1) (120MB compressed; ratio: 8:1) (130MB compressed; ratio: 8:1) (140MB compressed; ratio: 8:1) (150MB compressed; ratio: 8:1) (160MB compressed; ratio: 7:1)
added 17 referenced pages

dumping priority: HIGH [4]

added 459 referenced pages

dumping priority: MEDIUM [3]
 (170MB compressed; ratio: 8:1)
added 9123 referenced pages

dumping priority: LOW [2]

added 1106 referenced pages

dumping priority: LEAST [1]
 (180MB compressed; ratio: 7:1)
added 0 referenced pages

dumping priority: DEFAULT [0]
 (190MB compressed; ratio: 8:1) (200MB compressed; ratio: 8:1) (210MB compressed; ratio: 9:1) (220MB compressed; ratio: 10:1) (230MB compressed; ratio: 10:1) (240MB compressed; ratio: 11:1)
added 0 referenced pages

Dump complete
Core dumped.
[ thread pid 2569 tid 100282 ]
Stopped at      ether_ifdetach+0x10:    movq    (%rax),%rax
db>