Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual address	= 0x10
fault code		= supervisor read data  , page not present
instruction pointer	= 0x20:0xffffffff813e0139
stack pointer	        = 0x28:0xfffffe0016ad4710
frame pointer	        = 0x28:0xfffffe0016ad4770
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 (swi1: netisr 0)
trap number		= 12
panic: page fault
cpuid = 1
time = 4
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0016ad4370
vpanic() at vpanic+0x1e0/frame 0xfffffe0016ad43d0
panic() at panic+0x43/frame 0xfffffe0016ad4430
trap_fatal() at trap_fatal+0x4c6/frame 0xfffffe0016ad44b0
trap_pfault() at trap_pfault+0x9f/frame 0xfffffe0016ad4520
trap() at trap+0x44d/frame 0xfffffe0016ad4640
calltrap() at calltrap+0x8/frame 0xfffffe0016ad4640
--- trap 0xc, rip = 0xffffffff813e0139, rsp = 0xfffffe0016ad4710, rbp = 0xfffffe0016ad4770 ---
in6_cksum_partial() at in6_cksum_partial+0x179/frame 0xfffffe0016ad4770
rip6_input() at rip6_input+0x5ff/frame 0xfffffe0016ad4850
ip6_input() at ip6_input+0x1a9b/frame 0xfffffe0016ad4970
swi_net() at swi_net+0x23b/frame 0xfffffe0016ad49f0
ithread_loop() at ithread_loop+0x2f2/frame 0xfffffe0016ad4a60
fork_exit() at fork_exit+0xb0/frame 0xfffffe0016ad4ab0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0016ad4ab0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic
[ thread pid 12 tid 100017 ]
Stopped at      kdb_enter+0x6a: movq    $0,kdb_why