Ubuntu 16.04 crashes on shutdown / restart

[Mantvydas Juozapavicius]

This started for no appearent reason (but after reading about similar problems, I guess that it started after kernel update)

My Ubuntu 16.04 crashes (freezes) everytime I restart or shutdown (soft). And I have to use hard shutdown.
After that, Ubuntu starts normally, and runs without problems until the next restart or shutdown.

The syslog file does not display any abnormalities. Nor does the file kern.log
However, directory /var/crash/ contains 2 files with relevant information (_usr_lib_x86_64-linux-gnu_xfce4_panel_wrapper-1.0.1000.crash and _usr_bin_xfwm4.1000.crash). I attach them. I also attach a few photographs of the last screens.

All of the crashes involve kernel paging, but everytime at a different location:
BUG: unable to handle kernel paging request at ffff89??258e9100light:intel_backlight
BUG: unable to handle kernel paging request at ffff919e6545e100light:intel_backlight
BUG: unable to handle kernel paging request at ffff98d2e58b6100Load/Save Screen Backlight Brightness of leds:dell::kbd_backlight

System info.
Computer: Dell Inspiron 7567 i7-7700HQ/GTX1050Ti
OS: Ubuntu 16.04.3 LTS
Kernel: 4.13.0-30-generic

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.13.0-30-generic 4.13.0-30.33~16.04.1
ProcVersionSignature: Ubuntu 4.13.0-30.33~16.04.1-generic 4.13.13
Uname: Linux 4.13.0-30-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
CurrentDesktop: XFCE
Date: Wed Jan 17 18:30:32 2018
InstallationDate: Installed on 2017-04-23 (268 days ago)
InstallationMedia: Xubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215)
SourcePackage: linux-hwe
UpgradeStatus: No upgrade log present (probably fresh install)

[Mantvydas Juozapavicius (mantvius)]

from /var/crash/

[Mantvydas Juozapavicius (mantvius)]

from /var/crash/

[Mantvydas Juozapavicius (mantvius)]

just in case... :)

[Mantvydas Juozapavicius (mantvius)]

An updade on kernel versions.

Originally I saw the bug with kernel version 4.13.0-30
Later I checked and found that the bug is present in versions 4.13.0-29 and 4.13.0-26
No bug in kernel 4.10.0-42

[Mantvydas Juozapavicius (mantvius)]

I was advised to rephrase the description of the bug.

Steps to reproduce:
Restart or shutdown (soft) the computer.

Got result:
The computer crashes (freezes). And I have to use hard shutdown.

Expected result:
The computer restarts or shuts down normally.

[Po-Hsu Lin (cypressyew)]

Hello,
4.13.0 is not supported anymore, please feel free to open a new bug with a newer kernel if you're still experiencing this issue.
Thanks