login: Fatal user address access from kernel mode from race_map at ffffffff809a2540


Fatal trap 12: page fault while in kernel mode
cpuid = 5; lapic id = 5
fault virtual address	= 0x8
fault code		= supervisor read data, page not present
instruction pointer	= 0x8:0xffffffff809a2540
stack pointer	        = 0x10:0xfffff80117a5f650
frame pointer	        = 0x10:0xfffff80117a5f708
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		= 935
current thread          = pri 10 
kernel: type 12 trap, code=0

CPU5 stopping CPUs: 0x0000001f
 stopped
Stopped at      vm_map_rb_tree_RB_NEXT: movq    0x8(%rdi),%rax
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