login: DF5562: found ohci0 (driver ohci)
DF5562: probe/attach deferred (driver-added event will attach)
DF5562: harness loaded
veto0: <DF-5562 detach-veto child> on ohci0
veto0: attached to ohci0; my detach will EBUSY while the ohci driver is bound to the parent
DF5562: ohci0 alive: HCCA VA=0xfffff8008df7b000 [0006a000 0006b000 0006c000 0006d000] ctrl-ED VA=0xfffff8008df7c000
DF5562: calling device_detach(ohci0) [== what devclass_delete_driver does on kldunload / PCI hot-unplug]
uhub0: detached
ugen0.1: <Apple> at usbus0 (disconnected)
unknown: at usbus0, port 1, addr 1 (disconnected)
usbus0: detached
veto0: DETACH VETO: returning EBUSY -- watch ohci_pci_detach swallow this and tear down anyway
ohci0: detached
DF5562: device_detach(ohci0) returned 0 -- SUCCESS reported DESPITE live veto child (the lie)
DF5562: post: ohci0 driver=(none) state=0
DF5562: ohci0 STILL has 1 child device(s): veto0(attached=1)


Fatal trap 12: page fault while in kernel mode
cpuid = 3; lapic id = 3
fault virtual address	= 0x58
fault code		= supervisor read data, page not present
instruction pointer	= 0x8:0xffffffff826001c1
stack pointer	        = 0x10:0xfffff80118453a70
frame pointer	        = 0x10:0xfffff80118453ab0
code segment		= base 0x0, limit 0xfffff, type 0x1b
			= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags	= interrupt enabled, resume, IOPL = 0
current process		= Idle
current thread          = pri 12 
kernel: type 12 trap, code=0

CPU3 stopping CPUs: 0x00000037
 stopped
Stopped at      df5562_thread+0x91:     movq    0x58(%rax),%rcx
db>