Fatal trap 12: page fault while in kernel mode
cpuid = 0; lapic id = 0
fault virtual address	= 0x38
fault code		= supervisor read data, page not present
instruction pointer	= 0x8:0xffffffff804bf1e9
stack pointer	        = 0x10:0xfffff801171ed6f8
frame pointer	        = 0x10:0xfffff801171ed738
code segment		= base 0x0, limit 0xfffff, type 0x1b
			= DPL 0, pres 1, long 0, def32 0, gran 1
processor eflags	= interrupt enabled, resume, IOPL = 0
current process		= 831
current thread          = pri 6 
trap number		= 12
panic: page fault
cpuid = 0
Trace beginning at frame 0xfffff801171ed4e8
trap_fatal() at trap_fatal+0x301 0xffffffff80bd5a81 
trap_fatal() at trap_fatal+0x301 0xffffffff80bd5a81 
trap_pfault() at trap_pfault+0x431 0xffffffff80bd6061 
trap() at trap+0x17c 0xffffffff80bd65cc 
calltrap() at calltrap+0x9 0xffffffff80b99bfa 
--- trap 000000000000000c, rip = ffffffff804bf1e9, rsp = fffff801171ed6e0, rbp = fffff801171ed738 ---
fw_ioctl() at fw_ioctl+0x429 0xffffffff804bf1e9 
dev_dioctl() at dev_dioctl+0xa3 0xffffffff8062ce13 
boot() called on cpu#0
Uptime: 49s
Physical memory: 4060 MB
Dumping 554 MB: 539 523 507 491 475 459 443 427 411 395 379 363 347 331 315 299 283 267 251 235 219 203 187 171 155 139 123 107 91 75 59 43 27 11
Dump complete