System locked up completely

Describe the bug Just now the computer locked up completely. I had to 'raise elephants'. The computer was resuming from sleep - or, possibly, the screen was off but the computer was not suspended. The computer was doing little.

To Reproduce Unknown.

Frequency Does the issue happen:

[ ] Always
[X ] Randomly

Rather: it has happened once so far.

Edition (Desktop environment): In which edition is this happening?

[X] Cinnamon Edition
[ ] MATE Edition
[ ] Xfce Edition

Live or post-install: Indicate if this is happening after the installation, or during the live session:

[ X] Post-install
[ ] Live session

Screenshots If applicable, add screenshots to help explain your problem.

Locale: Paste the output of locale.

LANG=en_GB.UTF-8
LANGUAGE=en_GB:en
LC_CTYPE=en_GB.UTF-8
LC_NUMERIC=en_GB.UTF-8
LC_TIME=en_GB.UTF-8
LC_COLLATE="en_GB.UTF-8"
LC_MONETARY=en_GB.UTF-8
LC_MESSAGES="en_GB.UTF-8"
LC_PAPER=en_GB.UTF-8
LC_NAME=en_GB.UTF-8
LC_ADDRESS=en_GB.UTF-8
LC_TELEPHONE=en_GB.UTF-8
LC_MEASUREMENT=en_GB.UTF-8
LC_IDENTIFICATION=en_GB.UTF-8
LC_ALL=

Drivers: Paste the output of inxi -Gxx.


Graphics:  Device-1: Intel UHD Graphics 620 vendor: Lenovo driver: i915 v: kernel bus ID: 00:02.0 
           chip ID: 8086:5917 
           Display: x11 server: X.Org 1.20.4 driver: modesetting unloaded: fbdev,vesa 
           resolution: 2560x1440~60Hz 
           OpenGL: renderer: Mesa DRI Intel UHD Graphics 620 (Kabylake GT2) v: 4.5 Mesa 19.0.2 
           compat-v: 3.0 direct render: Yes

Crash report:

''Stack trace'' If you are reporting a crash. Go to "Software Sources" and enable the debug symbols [I did that; should it really prompt me to reload my apt cache?]. Then go to "System Reports" and extract the stack trace for your crash and paste it here.

I went to 'System Reports', saw the following, and was baffled.

''Dmesg'' If you type dmesg in a terminal, you should see a line corresponding to the crash. Paste it here.

I do not know how to extract the relevant line: so, I uploaded the whole output of `dmesg1 to pastebin.

Additional context Add any other context about the problem here.

The problem may be caused by some third-pary application - but if so, still, Cinnamon should not hang. The problem may have been caused by my Linux kernel (see below) but then again it may not have been.

Xsession log: xsesh-renamed-so-that-github-can-handle-it.txt

My system

OS: Linux Mint 19.1 Tessa x86_64 
Host: 20KHCTO1WW ThinkPad X1 Carbon 6th 
Kernel: 5.2.4-050204-generic 
Uptime: 9 mins 
Packages: 3167 (dpkg), 6 (flatpak), 6 (snap) 
Shell: bash 4.4.20 
Resolution: 2560x1440 @ 60.01Hz 
DE: Cinnamon 4.2.3 
WM: Mutter (Muffin) 
WM Theme: Mint-Y-Dark-trans (Mint-Y-Dark-BB_hack) 
Theme: Mint-Y-Dark [GTK2/3] 
Icons: Paper [GTK2/3] 
Terminal: xfce4-terminal 
CPU: Intel i7-8550U (8) @ 4.000GHz 
GPU: Intel UHD Graphics 620 
Memory: 3035MiB / 15927MiB 
Disk (/dev/nvme0n1p4): 18G / 40G (46%) 
Disk (/dev/nvme0n1p2): 186G / 405G (49%) 
Disk (udev): 0 / 7.8G (0%)

I am using the alpha channel (which still seems to be in operation, despite the existence of the beta release).

$  cinnamon --version
Cinnamon 4.2.3

linuxmint / mint19.2-beta

System locked up completely #80