I caught the console message on camera:

uvcvideo: Failed to query (GET_INFO) UVC control 15 on unit 1: -32 (exp.
1).

Googling around it seems this is a pretty spammy message, perhaps it is
unrelated to what is actually happening.

I can reproduce this crash putting my system under stress, opening a lot
of programs and making it swap. At some point it starts stuttering, then
crashes. It happens before the swap space is depleted, about 30% of a
2GB swap partition. It's a ThinkPad X1 laptop with SSD.

** Attachment added: "Screenshot_20200710-153131.png"
   
https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1886835/+attachment/5391439/+files/Screenshot_20200710-153131.png

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https://bugs.launchpad.net/bugs/1886835

Title:
  crashes to login screen, uvc related stuff blinks on console

Status in lightdm package in Ubuntu:
  New

Bug description:
  I started getting random crashes to login screen, about twice a day.
  When crashes I briefly see some logging output to screen mentioning "UVC 
Control" or uvcview. I'm not using the webcam when the system crashes.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: lightdm 1.26.0-0ubuntu1
  ProcVersionSignature: Ubuntu 5.3.0-61.55~18.04.1-generic 5.3.18
  Uname: Linux 5.3.0-61-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.15
  Architecture: amd64
  CurrentDesktop: Unity:Unity7:ubuntu
  Date: Wed Jul  8 11:55:34 2020
  InstallationDate: Installed on 2020-02-12 (146 days ago)
  InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64 
(20200203.1)
  SourcePackage: lightdm
  UpgradeStatus: No upgrade log present (probably fresh install)

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