Sounds like this is related to VT switching. GDM is in VT1 and the login
is on VT2.

While I can't reproduce the bug right now, I can kind of see how it could 
happen: After switching between a bunch of VTs, eventually VT1 starts showing 
two screens when I switch to it by Ctrl+Alt+F1:
 (a) For a split-second: the boot log/terminal on tty1; and then
 (b) The GDM login screen.

It's possible your Ctrl+C is somehow reaching tty1 on (a) before the
login screen redraws, which might kill GDM. Just a theory.

** Also affects: gnome-shell (Ubuntu)
   Importance: Undecided
       Status: New

** Tags added: gnome-17.10

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https://bugs.launchpad.net/bugs/1710637

Title:
  Input falls through to gdm3 and terminates the session on Ctrl+C

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