I've been trying some possibilities and I think I found the trigger of
the bug in my system.

The idea is that the bug appears when the "default" user of the login
screen uses a wallpaper DIFFERENT from the default one. This means that
the bug won't appear if a user has changed the wallpaper but the default
user (last logged) has the default one (for example, the guest). I
checked that when I restore the default wallpaper in one user the bug
doesn't happen for that user anymore.

When the loop crash happens, if I try to change using the arrows to a
user with a changed wallpaper the loop keeps happening, so it enforces
my theory. It is when you manage to select a user with the default
wallpaper that the loop stops. When stopped, I can select a user with a
different wallpaper without any problem.

And remember that by default wallpaper I mean ONLY the main default
wallpaper, not the entire set. Choosing any other of the default
wallpapers triggers the bug as well, it doesn't have to be downloaded
from an external source.

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https://bugs.launchpad.net/bugs/946674

Title:
  unity-greeter crashed with SIGSEGV in background_loader_ready_cb()

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