Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address	= 0x418
fault code		= supervisor read data  , page not present
instruction pointer	= 0x20:0xffffffff8107d9a8
stack pointer	        = 0x28:0xfffffe0021259500
frame pointer	        = 0x28:0xfffffe00212595b0
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		= 814 (syz-executor.0)
trap number		= 12
panic: page fault
cpuid = 0
time = 1557075025
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0021259160
vpanic() at vpanic+0x1e0/frame 0xfffffe00212591c0
panic() at panic+0x43/frame 0xfffffe0021259220
trap_fatal() at trap_fatal+0x4c6/frame 0xfffffe00212592a0
trap_pfault() at trap_pfault+0x9f/frame 0xfffffe0021259310
trap() at trap+0x44d/frame 0xfffffe0021259430
calltrap() at calltrap+0x8/frame 0xfffffe0021259430
--- trap 0xc, rip = 0xffffffff8107d9a8, rsp = 0xfffffe0021259500, rbp = 0xfffffe00212595b0 ---
_sx_xlock_hard() at _sx_xlock_hard+0x2f8/frame 0xfffffe00212595b0
_sx_xlock() at _sx_xlock+0x136/frame 0xfffffe0021259600
sblock() at sblock+0xeb/frame 0xfffffe0021259630
vn_sendfile() at vn_sendfile+0x650/frame 0xfffffe00212598e0
sendfile() at sendfile+0x155/frame 0xfffffe0021259980
amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe0021259ab0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe0021259ab0
--- syscall (198, FreeBSD ELF64, nosys), rip = 0x41309a, rsp = 0x7fffdffdcf38, rbp = 0x4 ---
KDB: enter: panic
[ thread pid 814 tid 100140 ]
Stopped at      kdb_enter+0x6a: movq    $0,kdb_why