Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual address	= 0x420
fault code		= supervisor read data, page not present
instruction pointer	= 0x20:0xffffffff8104c3b5
stack pointer	        = 0x28:0xfffffe00244f6750
frame pointer	        = 0x28:0xfffffe00244f6810
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		= 848 (syz-executor.0)
trap number		= 12
panic: page fault
cpuid = 1
time = 1580747087
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe00244f6350
vpanic() at vpanic+0x1ce/frame 0xfffffe00244f63c0
panic() at panic+0x43/frame 0xfffffe00244f6420
trap_fatal() at trap_fatal+0x4cc/frame 0xfffffe00244f64a0
trap_pfault() at trap_pfault+0xdc/frame 0xfffffe00244f6540
trap() at trap+0x402/frame 0xfffffe00244f6680
calltrap() at calltrap+0x8/frame 0xfffffe00244f6680
--- trap 0xc, rip = 0xffffffff8104c3b5, rsp = 0xfffffe00244f6750, rbp = 0xfffffe00244f6810 ---
_sx_xlock_hard() at _sx_xlock_hard+0x335/frame 0xfffffe00244f6810
_sx_xlock() at _sx_xlock+0x134/frame 0xfffffe00244f6860
soreceive_generic() at soreceive_generic+0x1a2/frame 0xfffffe00244f6920
soreceive() at soreceive+0xb9/frame 0xfffffe00244f6980
kern_recvit() at kern_recvit+0x31f/frame 0xfffffe00244f6a40
sys_recvfrom() at sys_recvfrom+0xb5/frame 0xfffffe00244f6ab0
amd64_syscall() at amd64_syscall+0x499/frame 0xfffffe00244f6bf0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe00244f6bf0
--- syscall (198, FreeBSD ELF64, nosys), rip = 0x4132ea, rsp = 0x7fffdffbbf38, rbp = 0x6 ---
KDB: enter: panic
[ thread pid 848 tid 100279 ]
Stopped at      kdb_enter+0x67: movq    $0,0x1466bf6(%rip)
db> 
db>