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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