Fatal trap 12: page fault while in kernel mode
cpuid = 0; interface if_tuntap.1 already present in the KLD 'kernel'!
apic id = 00
fault virtual address	= 0x0
fault code		= supervisor read data, page not present
linker_load_file: /boot/kernel/if_tap.ko - unsupported file type
instruction pointer	= 0x20:0xffffffff818a8ffd
stack pointer	        = 0x28:0xfffffe00212adfd0
interface if_tuntap.1 already present in the KLD 'kernel'!
linker_load_file: /boot/kernel/if_tap.ko - unsupported file type
frame pointer	        = 0x28:0xfffffe00212ae030
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		= 801 (syz-executor.3)
trap number		= 12
panic: page fault
cpuid = 0
time = 1558328648
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe00212adc30
vpanic() at vpanic+0x1e0/frame 0xfffffe00212adc90
panic() at panic+0x43/frame 0xfffffe00212adcf0
trap_fatal() at trap_fatal+0x4c6/frame 0xfffffe00212add70
trap_pfault() at trap_pfault+0x9f/frame 0xfffffe00212adde0
trap() at trap+0x44d/frame 0xfffffe00212adf00
calltrap() at calltrap+0x8/frame 0xfffffe00212adf00
--- trap 0xc, rip = 0xffffffff818a8ffd, rsp = 0xfffffe00212adfd0, rbp = 0xfffffe00212ae030 ---
link_elf_search_symbol() at link_elf_search_symbol+0x7d/frame 0xfffffe00212ae030
linker_ddb_search_symbol() at linker_ddb_search_symbol+0xa7/frame 0xfffffe00212ae090
stack_sbuf_print_ddb() at stack_sbuf_print_ddb+0x6a/frame 0xfffffe00212ae0f0
witness_debugger() at witness_debugger+0xa7/frame 0xfffffe00212ae220
witness_checkorder() at witness_checkorder+0xf72/frame 0xfffffe00212ae2d0
_sx_xlock() at _sx_xlock+0xb3/frame 0xfffffe00212ae320
ufsdirhash_add() at ufsdirhash_add+0x42/frame 0xfffffe00212ae3c0
ufs_direnter() at ufs_direnter+0x5ed/frame 0xfffffe00212ae490
ufs_makeinode() at ufs_makeinode+0xa7f/frame 0xfffffe00212ae630
ufs_create() at ufs_create+0x40/frame 0xfffffe00212ae670
VOP_CREATE_APV() at VOP_CREATE_APV+0xc2/frame 0xfffffe00212ae6a0
vn_open_cred() at vn_open_cred+0x409/frame 0xfffffe00212ae800
kern_openat() at kern_openat+0x2f7/frame 0xfffffe00212ae980
amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe00212aeab0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe00212aeab0
--- syscall (5, FreeBSD ELF64, sys_open), rip = 0x2000000b, rsp = 0x7fffdfffdeb8, rbp = 0xa ---
KDB: enter: panic
[ thread pid 801 tid 100118 ]
Stopped at      kdb_enter+0x6a: movq    $0,kdb_why