Fatal user address access from kernel mode from mmap_alias_rw at ffffffff80c0cdc6


Fatal trap 12: page fault while in kernel mode
cpuid = 0; lapic id = 0
fault virtual address	= 0xffff80403e005000
fault code		= supervisor read data, page not present
instruction pointer	= 0x8:0xffffffff80c0cdc6
stack pointer	        = 0x10:0xfffff80117e3a3e0
frame pointer	        = 0x10:0xfffff80117e3a3f8
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		= 876
current thread          = pri 6 
kernel: type 12 trap, code=0

CPU0 stopping CPUs: 0x0000003e
 stopped
Stopped at      pmap_kextract.part.23+0x16:     movq    (%rax,%rdx,1),%rdx
db>