(kernel serial console)
Fatal user address access from kernel mode from sysctl at ffffffff82606e66
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x0
Stopped at      dfv_acam_sysctl+0x116:  movq    (%rax),%rcx      <- atadev[tid]->dev, rax=0
--- fixed source A/B ---
DF2501: log: xpt_done(status=0x8)          <- CAM_DEV_NOT_THERE, guest survives