Fatal trap 12: page fault while in kernel mode
interface if_tuntap.1 already present in the KLD 'kernel'!
cpuid = 0; apic id = 00
09:55:47 executing program 0:
r0 = socket(0x2, 0x10000001, 0x84)
connect$unix(r0, &(0x7f0000000000)=ANY=[@ANYBLOB="82052e2f66696c653000"], 0x10)
sendto(r0, &(0x7f0000000140)='%', 0x1, 0x0, 0x0, 0x0)
setsockopt$inet6_sctp_SCTP_EVENTS(r0, 0x84, 0xc, &(0x7f0000000040)={0x0, 0x0, 0x0, 0x6}, 0xb)
setsockopt$inet6_sctp_SCTP_RTOINFO(r0, 0x84, 0x1, &(0x7f0000000100)={0x0, 0x0, 0x80000001}, 0x10)
recvfrom$unix(r0, &(0x7f00000006c0)=""/159, 0x9f, 0x0, 0x0, 0x0)
execve(0x0, 0x0, 0x0)
recvmsg(r0, &(0x7f0000000540)={0x0, 0x0, 0x0, 0x0, 0x0}, 0x2)
shutdown(r0, 0x1)

09:55:47 executing program 1:
r0 = socket(0x2, 0x1, 0x0)
connect$unix(r0, &(0x7f0000000000)=@file={0xbd5699bc1ec0282, './file0\x00'}, 0x339)
setsockopt$inet6_tcp_int(r0, 0x6, 0x100, &(0x7f0000000040), 0x4)

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	        = 0x28:0xfffffe001fab80f0
frame pointer	        = 0x28:0xfffffe001fab8150
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		= 804 (syz-executor.2)
trap number		= 12
panic: page fault
cpuid = 0
time = 1558605347
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe001fab7d50
vpanic() at vpanic+0x1e0/frame 0xfffffe001fab7db0
panic() at panic+0x43/frame 0xfffffe001fab7e10
trap_fatal() at trap_fatal+0x4c6/frame 0xfffffe001fab7e90
trap_pfault() at trap_pfault+0x9f/frame 0xfffffe001fab7f00
trap() at trap+0x44d/frame 0xfffffe001fab8020
calltrap() at calltrap+0x8/frame 0xfffffe001fab8020
--- trap 0xc, rip = 0xffffffff818a8ffd, rsp = 0xfffffe001fab80f0, rbp = 0xfffffe001fab8150 ---
link_elf_search_symbol() at link_elf_search_symbol+0x7d/frame 0xfffffe001fab8150
linker_ddb_search_symbol() at linker_ddb_search_symbol+0xa7/frame 0xfffffe001fab81b0
stack_sbuf_print_ddb() at stack_sbuf_print_ddb+0x6a/frame 0xfffffe001fab8210
witness_debugger() at witness_debugger+0xa7/frame 0xfffffe001fab8340
witness_checkorder() at witness_checkorder+0xf72/frame 0xfffffe001fab83f0
lockmgr_xlock_hard() at lockmgr_xlock_hard+0xb5/frame 0xfffffe001fab8480
__lockmgr_args() at __lockmgr_args+0x488/frame 0xfffffe001fab8530
ffs_lock() at ffs_lock+0xea/frame 0xfffffe001fab8590
VOP_LOCK1_APV() at VOP_LOCK1_APV+0xc5/frame 0xfffffe001fab85c0
_vn_lock() at _vn_lock+0xaf/frame 0xfffffe001fab8630
vget() at vget+0xb1/frame 0xfffffe001fab8680
vfs_hash_get() at vfs_hash_get+0x148/frame 0xfffffe001fab86d0
ffs_vgetf() at ffs_vgetf+0x51/frame 0xfffffe001fab8760
softdep_sync_buf() at softdep_sync_buf+0x444/frame 0xfffffe001fab8850
ffs_syncvnode() at ffs_syncvnode+0x394/frame 0xfffffe001fab88e0
VOP_FDATASYNC_APV() at VOP_FDATASYNC_APV+0xc5/frame 0xfffffe001fab8910
kern_fsync() at kern_fsync+0x290/frame 0xfffffe001fab8980
amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe001fab8ab0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe001fab8ab0
--- syscall (198, FreeBSD ELF64, nosys), rip = 0x41309a, rsp = 0x7fffdfffdf38, rbp = 0x1 ---
KDB: enter: panic
[ thread pid 804 tid 100120 ]
Stopped at      kdb_enter+0x6a: movq    $0,kdb_why