I was also able to reproduce this in kernels 4.4.0-139, -140 and -141. Kernel 
4.4.0-138 worked fine.
On kernel 4.4.0-140, the freeze didn't occur instantly but after about 20 
seconds, so I was able to capture a stacktrace.

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  Summary: Kernel bug (unhandled paging request) on "udisksctl power-

Status in linux package in Ubuntu:

Bug description:
  lsb_release -rd
  Description:  Ubuntu 16.04.5 LTS
  Release:      16.04

  uname -a
  Linux metabox 4.4.0-139-generic #165-Ubuntu SMP Wed Oct 24 10:58:50 UTC 2018 
x86_64 x86_64 x86_64 GNU/Linux

  Steps (1) to reproduce:
  1) Plug in a USB3 hard drive.
  2) Right click on launcher icon.
  3) Select "Safely Remove".

  After finding this: https://askubuntu.com/a/532691
  ...the following steps also reproduce the problem.

  Steps (2) to reproduce:
  1) Plugin in a USB3 hard drive.
  2) udisksctl unmount -b /dev/sdXY
  3) udisksctl power-off -b /dev/sdX

  System completely locks and becomes unresponsive, such that even the Magic 
SysRq key combination does nothing.
  Most of the time the fans on my laptop go crazy (so the CPU must get stuck in 
some loop), but once they did not and the system was just locked (without the 
fans going nuts).

  I can't get a textual copy of the kernel bug log (because I have to do a hard 
reset to regain control of the system and the output doesn't get flushed to 
disk), but I did manage to get a photo of some of it (please refer to 
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
   /dev/snd/pcmC1D0p:   matt       2754 F...m pulseaudio
   /dev/snd/controlC1:  matt       2754 F.... pulseaudio
   /dev/snd/controlC0:  matt       2754 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 16.04
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=f00235c0-ba8a-4403-91b1-64e9d87b76e0
  InstallationDate: Installed on 2016-04-23 (940 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
  MachineType: Notebook N150SD/N155SD
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-139-generic 
root=UUID=beb9b9ce-39a7-464a-978c-ac4fb82a5a81 ro quiet splash
  ProcVersionSignature: Ubuntu 4.4.0-139.165-generic 4.4.160
   linux-restricted-modules-4.4.0-139-generic N/A
   linux-backports-modules-4.4.0-139-generic  N/A
   linux-firmware                             1.157.20
  Tags:  xenial
  Uname: Linux 4.4.0-139-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo vboxusers wireshark
  _MarkForUpload: True
  dmi.bios.date: 03/31/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1.03.05
  dmi.board.asset.tag: Tag 12345
  dmi.board.name: N150SD/N155SD
  dmi.board.vendor: Notebook
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: Notebook
  dmi.chassis.version: N/A
  dmi.product.name: N150SD/N155SD
  dmi.product.version: Not Applicable
  dmi.sys.vendor: Notebook

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