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	= 0x20:0xffffffff8156d401
stack pointer	        = 0x28:0xfffffe0057279ae0
frame pointer	        = 0x28:0xfffffe0057279c20
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		= 2 (clock (1))
rdi: 0000000000000000 rsi: 0000000000000000 rdx: 0000000000000000
rcx: fffffe00033eee30  r8: 0000000000000000  r9: 0000000000000001
rax: fffffe00033eee30 rbx: fffffe0079e619e0 rbp: fffffe0057279c20
r10: c0afc98e6abb4a35 r11: 0000000000000017 r12: 0000000000000000
r13: 00000088c0b08b97 r14: fffffe0079e619d8 r15: 0000000000000000
trap number		= 12
panic: page fault
cpuid = 0
time = 39
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0xc6/frame 0xfffffe0057279310
kdb_backtrace() at kdb_backtrace+0xd0/frame 0xfffffe0057279470
vpanic() at vpanic+0x257/frame 0xfffffe0057279630
panic() at panic+0xb5/frame 0xfffffe00572796f0
trap_pfault() at trap_pfault+0xaec/frame 0xfffffe0057279830
trap() at trap+0x78e/frame 0xfffffe0057279a10
calltrap() at calltrap+0x8/frame 0xfffffe0057279a10
--- trap 0xc, rip = 0xffffffff8156d401, rsp = 0xfffffe0057279ae0, rbp = 0xfffffe0057279c20 ---
callout_process() at callout_process+0x441/frame 0xfffffe0057279c20
handleevents() at handleevents+0x3ee/frame 0xfffffe0057279c90
timercb() at timercb+0x3cb/frame 0xfffffe0057279d50
lapic_handle_timer() at lapic_handle_timer+0x17f/frame 0xfffffe0057279d90
Xtimerint() at Xtimerint+0xb1/frame 0xfffffe0057279d90
--- interrupt, rip = 0xffffffff820d6d81, rsp = 0xfffffe0057279e60, rbp = 0xfffffe0057279e80 ---
spinlock_exit() at spinlock_exit+0xd1/frame 0xfffffe0057279e80
softclock_thread() at softclock_thread+0xee/frame 0xfffffe0057279ef0
fork_exit() at fork_exit+0xcc/frame 0xfffffe0057279f30
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0057279f30
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic
[ thread pid 2 tid 100032 ]
Stopped at      kdb_enter+0x6e: movq    $0,0x25bd7e7(%rip)
db> 
db> set $lines = 0
db> set $maxwidth = 0
db>