--- Comment #35 from Hans Petter Selasky <hsela...@freebsd.org> ---
Each USB device instance has a global SX lock. This lock is held during detach.
usbconfig also acquire this lock. If the USB detach cannot complete, because
character devices towards user-space cannot be destroyed, because user-space
apps via libusb keep file /dev/ugenX.Y handles open, then enumeration will
appear frozen until this situation is resolved?
Is that more clear?
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