Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address	= 0x0
fault code		= supervisor read data, page not present
instruction pointer	= 0x20:0xffffffff8159d501
stack pointer	        = 0x28:0xfffffe0056e03a80
frame pointer	        = 0x28:0xfffffe0056e03bc0
code segment		= base 0x0, limit 0xfffff, type 0x1b
			= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags	= resume, IOPL = 0
current process		= 1437 (syz-executor)
rdi: 0000000000000000 rsi: 0000000000000000 rdx: 0000000000000000
rcx: fffffe0002bf1850  r8: 0000000000000000  r9: 0000000000000001
rax: fffffe0000000000 rbx: fffffe0054128498 rbp: fffffe0056e03bc0
r10: 17ba2bb63037941b r11: 0000000000000017 r12: 0000000000000000
r13: 0000004b1803250f r14: fffffe0054128490 r15: 0000000000000000
trap number		= 12
panic: page fault
cpuid = 0
time = 33
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0xc6/frame 0xfffffe0056e032b0
kdb_backtrace() at kdb_backtrace+0xd0/frame 0xfffffe0056e03410
vpanic() at vpanic+0x257/frame 0xfffffe0056e035d0
panic() at panic+0xb5/frame 0xfffffe0056e03690
trap_pfault() at trap_pfault+0xaf2/frame 0xfffffe0056e037d0
trap() at trap+0x78e/frame 0xfffffe0056e039b0
calltrap() at calltrap+0x8/frame 0xfffffe0056e039b0
--- trap 0xc, rip = 0xffffffff8159d501, rsp = 0xfffffe0056e03a80, rbp = 0xfffffe0056e03bc0 ---
callout_process() at callout_process+0x441/frame 0xfffffe0056e03bc0
handleevents() at handleevents+0x3ee/frame 0xfffffe0056e03c30
timercb() at timercb+0x3cb/frame 0xfffffe0056e03cf0
lapic_handle_timer() at lapic_handle_timer+0x17f/f