Fatal trap 9: general protection fault while in kernel mode
cpuid = 1; apic id = 01
instruction pointer	= 0x20:0xffffffff816ca6d1
stack pointer	        = 0x28:0xfffffe001f999540
frame pointer	        = 0x28:0xfffffe001f999540
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		= 2103 (syz-executor.0)
trap number		= 9
panic: general protection fault
cpuid = 1
time = 1558404418
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe001f999210
vpanic() at vpanic+0x1e0/frame 0xfffffe001f999270
panic() at panic+0x43/frame 0xfffffe001f9992d0
trap_fatal() at trap_fatal+0x4c6/frame 0xfffffe001f999350
trap() at trap+0xba/frame 0xfffffe001f999470
calltrap() at calltrap+0x8/frame 0xfffffe001f999470
--- trap 0x9, rip = 0xffffffff816ca6d1, rsp = 0xfffffe001f999540, rbp = 0xfffffe001f999540 ---
memcmp() at memcmp+0xa1/frame 0xfffffe001f999540
authunix_create() at authunix_create+0x25b/frame 0xfffffe001f999800
sys_nlm_syscall() at sys_nlm_syscall+0xed/frame 0xfffffe001f999980
amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe001f999ab0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe001f999ab0
--- syscall (154, FreeBSD ELF64, sys_nlm_syscall), rip = 0x200003cd, rsp = 0x7fffdfffdeb8, rbp = 0xa ---
KDB: enter: panic
[ thread pid 2103 tid 100825 ]
Stopped at      kdb_enter+0x6a: movq    $0,kdb_why