unable to mount luks-encrypted device - R3.1rc2 w/ sys-usb enabled

[mfc]

R3.1rc2, I have sys-usb enabled. Following: https://www.qubes-os.org/doc/usb/

1. The device (hard drive) shows up on qvm-block -l (sda and sda1)
2. I can assign them to an arbitrary AppVM (I have tried Fedora 23 and Debian 8 based AppVMs)
3. The hard drive does not show up in Nautilus or Dolphin file managers
4. qvm-block -l shows that the device has been attached to the AppVM as xvdi, however in the AppVM there is no /dev/xvdi listed.
5. unable to mount device, decrypt, use.
6. upon detaching (qvm-block -d AppVM), get the following error:

Trackback (most recent call last):
  File "/usr/bin/qvm-block", line 151, in <module>
    main()
  File "/usr/bin/qvm-block", line 122, in main
    block_detach_all(vm)
  File "/usr/lib64/python2.7/site-packages/qubes/qubesutils.py", line 459, in block_detach_all
    block_detach(vm, None)
  File "/usr/lib64/python2.7/site-packages/qubes/qubesutils.py", line 447, in block_detach vm.libvirt_domain.detachDevice(etree.tostring(dis, encoding='utf-8'))
  File "/usr/lib64/python2.7/site-packages/libvirt.py", line 1146, in detachDevice
    if ret == -1: raise libvirtError ('virDomainDetachDevice() failed', dom=self)
libvirt.libvirtError: internal error: libxenlight failed to detach disk 'xvdi'

[mfc]

reboot solved it.

[mfc]

reboot solved it.