Device Mapper version 4.16.0 loaded
Fatal user address access from kernel mode from dm_uninit_msg at ffffffff80657ec5
Fatal trap 12: page fault while in kernel mode
fault virtual address	= 0x2e2e7a4a7054
fault code		= supervisor read data, page not present
instruction pointer	= 0x8:0xffffffff80657ec5
current process		= 987
kernel: type 12 trap, code=0
Stopped at      _kfree+0x45:    movl    0x54(%rax),%r13d
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