[Bug 210736] Disconnecting USB cable in device/gadget mode breaks usbconfig(8)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210736

            Bug ID: 210736
           Summary: Disconnecting USB cable in device/gadget mode breaks
                    usbconfig(8)
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: arm
          Assignee: freebsd-arm at FreeBSD.org
          Reporter: trasz at FreeBSD.org

Hardware is Raspberry Pi Zero, configured to work as USB device -
usb_template.ko is loaded, hw.usb.template=8, there's getty listening on
/dev/ttyU0 and there is a configured IP address on ue0.

Problem: disconnecting the USB cable results in... well, nothing.  Running
"usbconfig" results in it hanging, ^T shows:

load: 0.69  cmd: usbconfig 620 [USB config SX lock] 2.61r 0.00u 0.02s 0% 2004k

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