USB hubs/controllers detached before umass devices

["John D. Baker" <jdbaker%consolidated.net@localhost>]

I just updated my NetBSD live-USB devices to 10.0_RC6.  They boot
successfully, but when performing an orderly shutdown, the various
uhubN and usbN devices are detached before the USB-resident filesystems
are unmounted and the underlying umassN (sdN) devices are detached.

This leaves the system hung trying to detach the sdN device but then
getting:

  sd0(umass0:0:0:0) Generic HBA error
  sd0a unable to read fsbn XXXXXXXX (etc.)

Has anyone else seen this?  It did not happen when my live-USB had
netbsd-9 on it.

I will try again on my live-USB drive which has -current on it.

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