Fatal trap 12: page fault while in kernel mode
cpuid = 3; lapic id = 3
fault virtual address	= 0x8004a1248
fault code		= supervisor write data, page not present
instruction pointer	= 0x8:0xffffffff802b0169
stack pointer	        = 0x10:0xfffff8008d3339b0
frame pointer	        = 0x10:0xfffff8008d3339d0
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		= Idle
current thread          = pri 14 (CRIT)
kernel: type 12 trap, code=2

CPU3 stopping CPUs: 0x00000037
 stopped
Stopped at      swi_cambio+0x59:        movq    %rdx,0x48(%rax)
db>