Shutdown hangs if umass(4) media still mounted

"John D. Baker" <[email protected]> Thu, 23 Jun 2016 09:30:26 -0500 (CDT)

Newsgroups	gmane.os.netbsd.current,gmane.os.netbsd.ports.evbmips
Message-ID	<[email protected]>

I just updated my Lemote Yeeloong to 7.99.32 (previously 7.99.27) and
upon shutting down I saw the following messages:

ehci_sync_hc: cv_timedwait() = 35
ehci_sync_hc: cv_timedwait() = 35
umass0: BBB reset failed, TIMEOUT
ehci_sync_hc: cv_timedwait() = 35
umass0: BBB bulk-in clear stall failed, TIMEOUT
ehci_sync_hc: cv_timedwait() = 35
umass0: BBB bulk-in clear stall failed, TIMEOUT
ehci_sync_hc: cv_timedwait() = 35
ehci_sync_hc: cv_timedwait() = 35
umass0: BBB reset failed, TIMEOUT
ehci_sync_hc: cv_timedwait() = 35
umass0: BBB bulk-in clear stall failed, TIMEOUT
ehci_sync_hc: cv_timedwait() = 35
umass0: BBB bulk-in clear stall failed, TIMEOUT
[pattern repeats]

On this system, "/" and "/var" are on an SD card in the Yeeloong's
USB-attached SD card reader.  They are still mounted at this point.

I had no such problem with shutdown/reboot before.

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