This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 1803929
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Tags added: xenial
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https://bugs.launchpad.net/bugs/1803929
Title:
Summary: Kernel bug (unhandled paging request) on "udisksctl power-
off"
Status in linux package in Ubuntu:
Incomplete
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 attachment).
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