I just noticed that the crash leaves a $HOME/core file:

    $ file core
    core: ELF 64-bit LSB core file x86-64, version 1 (SYSV), SVR4-style, from 
'/usr/bin/Xwayland :0 -rootless -terminate -core -listen 4 -listen 5 
-displayfd', real uid: 1000, effective uid: 1000, real gid: 1000, effective 
gid: 1000, execfn: '/usr/bin/Xwayland', platform: 'x86_64'

Could this be helpful?

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1753131

Title:
  gnome-shell crashes occasionally (libmutter)

Status in gnome-shell package in Ubuntu:
  Incomplete

Bug description:
  I see occasional crashes of gnome-shell that get me back to the login
  screen.

  After these crashes I find something like the following line in dmesg:

  gnome-shell[8428]: segfault at b0 ip 00007fddec8387d1 sp
  00007ffdf2061a80 error 4 in libmutter-1.so.0.0.0[7fddec763000+142000]

  Ubuntu: 17.10
  gnome-shell: 3.26.2-0ubuntu0.1
  mutter: 3.26.2-0ubuntu0.1

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1753131/+subscriptions

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