Fatal user address access from kernel mode from poc at ffffffff809d75cc


Fatal trap 12: page fault while in kernel mode
cpuid = 1; lapic id = 1
fault virtual address	= 0x0
fault code		= supervisor read data, page not present
instruction pointer	= 0x8:0xffffffff809d75cc
stack pointer	        = 0x10:0xfffff801178bf5f0
frame pointer	        = 0x10:0xfffff801178bf638
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		= 919
current thread          = pri 6 
kernel: type 12 trap, code=0

CPU1 stopping CPUs: 0x0000003d
 stopped
Stopped at      strcmp+0xc:     movzbl  (%rdi,%rax,1),%edx
db>