Fatal trap 12: page fault while in kernel mode
interface if_tuntap.1 already present in the KLD 'kernel'!
cpuid = 1; apic id = 01
fault virtual address	= 0x0
linker_load_file: /boot/kernel/if_tap.ko - unsupported file type
fault code		= supervisor read data, page not present
instruction pointer	= 0x20:0xffffffff818a8ffd
stack pointer	        = 0x28:0xfffffe00212fb0f0
frame pointer	        = 0x28:0xfffffe00212fb150
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		= 1059 (syz-executor.3)
trap number		= 12
panic: page fault
cpuid = 1
time = 1558505182
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe00212fad50
vpanic() at vpanic+0x1e0/frame 0xfffffe00212fadb0
panic() at panic+0x43/frame 0xfffffe00212fae10
trap_fatal() at trap_fatal+0x4c6/frame 0xfffffe00212fae90
trap_pfault() at trap_pfault+0x9f/frame 0xfffffe00212faf00
trap() at trap+0x44d/frame 0xfffffe00212fb020
calltrap() at calltrap+0x8/frame 0xfffffe00212fb020
--- trap 0xc, rip = 0xffffffff818a8ffd, rsp = 0xfffffe00212fb0f0, rbp = 0xfffffe00212fb150 ---
link_elf_search_symbol() at link_elf_search_symbol+0x7d/frame 0xfffffe00212fb150
linker_ddb_search_symbol() at linker_ddb_search_symbol+0xa7/frame 0xfffffe00212fb1b0
stack_sbuf_print_ddb() at stack_sbuf_print_ddb+0x6a/frame 0xfffffe00212fb210
witness_debugger() at witness_debugger+0xa7/frame 0xfffffe00212fb340
witness_checkorder() at witness_checkorder+0xf72/frame 0xfffffe00212fb3f0
lockmgr_xlock_hard() at lockmgr_xlock_hard+0xb5/frame 0xfffffe00212fb480
__lockmgr_args() at __lockmgr_args+0x488/frame 0xfffffe00212fb530
ffs_lock() at ffs_lock+0xea/frame 0xfffffe00212fb590
VOP_LOCK1_APV() at VOP_LOCK1_APV+0xc5/frame 0xfffffe00212fb5c0
_vn_lock() at _vn_lock+0xaf/frame 0xfffffe00212fb630
vget() at vget+0xb1/frame 0xfffffe00212fb680
vfs_hash_get() at vfs_hash_get+0x148/frame 0xfffffe00212fb6d0
ffs_vgetf() at ffs_vgetf+0x51/frame 0xfffffe00212fb760
softdep_sync_buf() at softdep_sync_buf+0x444/frame 0xfffffe00212fb850
ffs_syncvnode() at ffs_syncvnode+0x394/frame 0xfffffe00212fb8e0
VOP_FDATASYNC_APV() at VOP_FDATASYNC_APV+0xc5/frame 0xfffffe00212fb910
kern_fsync() at kern_fsync+0x290/frame 0xfffffe00212fb980
amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe00212fbab0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe00212fbab0
--- syscall (198, FreeBSD ELF64, nosys), rip = 0x41309a, rsp = 0x7fffdfffdf38, rbp = 0x1 ---
KDB: enter: panic
[ thread pid 1059 tid 100430 ]
Stopped at      kdb_enter+0x6a: movq    $0,kdb_why