That log message is very common in GTK apps. I don't think it is related
to crashing.

As for $HOME/core, it sounds like you're now stuck on bug 1746874.
Sorry. I hope we can fix that soon.

You received this bug notification because you are a member of Desktop
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  gnome-shell crashes occasionally (libmutter)

Status in gnome-shell package in Ubuntu:

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

  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

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