login: Fatal user address access from kernel mode from trigger at ffffffff80647bad


Fatal trap 12: page fault while in kernel mode
cpuid = 2; lapic id = 2
fault virtual address	= 0x0
fault code		= supervisor read data, page not present
instruction pointer	= 0x8:0xffffffff80647bad
stack pointer	        = 0x10:0xfffff801182df6f8
frame pointer	        = 0x10:0xfffff801182df758
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		= 951
current thread          = pri 10 
kernel: type 12 trap, code=0

CPU2 stopping CPUs: 0x0000003b
 stopped
Stopped at      lockmgr_exclusive+0x5d: orl     (%r14),%esi
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