TITLE: Fatal trap NUM: page fault while in kernel mode in atrtc_settime

Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address	= 0xffffffff12852143
fault code		= supervisor read data, page not present
instruction pointer	= 0x20:0xffffffff8102fe62
stack pointer	        = 0x28:0xfffffe009524a960
frame pointer	        = 0x28:0xfffffe009524a990
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		= 3094 (syz-executor0)
trap number		= 12
panic: page fault
cpuid = 0
KDB: stack backtrace:
#0 0xffffffff80aada97 at kdb_backtrace+0x67
#1 0xffffffff80a6bb76 at vpanic+0x186
#2 0xffffffff80a6b9e3 at panic+0x43
#3 0xffffffff80edf832 at trap_fatal+0x322
#4 0xffffffff80edf889 at trap_pfault+0x49
#5 0xffffffff80edf0c6 at trap+0x286
#6 0xffffffff80ec3641 at calltrap+0x8
#7 0xffffffff810302fc at atrtc_settime+0xc
#8 0xffffffff80ab7361 at resettodr+0xf1
#9 0xffffffff80a7fcc6 at settime+0x156
#10 0xffffffff80a7fae5 at sys_clock_settime+0x85
#11 0xffffffff80ee0394 at amd64_syscall+0x6c4
#12 0xffffffff80ec392b at Xfast_syscall+0xfb
