--- Comment #43 from ---

More and more I am becoming convinced that this is a problem in VirtualBox.

I think that your patch (r327996) uncovered this bug in the way that vbox maps
real USB controller(s) to virtual USB controller(s).

In an attempt to prove this point, I ordered several Renesas (NEC) USB 3.0
controllers (uPD720201 chipset) to replace the VIA USB 3.0 controllers (VL805

Some of the motherboard being used have Renesas (NEC) USB 3.0 controller(s)

All other motherboards do not have built-in USB 3.0 controller(s) and use an
add-on PCI-e card to add 2, 4, 5 or 7 ports.

I am using "sg_modes -a -vvvvv <device>" as a control.

In all cases where FreeBSD (and various Linux flavors) were running on the
"bare metal", no problems with either controller type were noticed.

When FreeBSD (and the Linux systems) is running as a VirtualBox guest, no
issues are seen when the Renesas USB 3.0 controller is used

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