Update:

Sorry I forgot: Ubuntu 15.10, lightdm 1.16.7

Still the same problem as  2016-02-25:

Sometimes my keyboard starts sending the number '5', as if someone is holding 
down the key. It stops if I touch another key.
If this happens while I'm away and the screen is locked, then I can't delete 
the password entry field or press enter to get an invalid password and start 
over. I can get a prompt via alt+ctrl+1 and sometimes it's enough to kill 
lightdm, and other times I must hold the power button down until the machine 
powers down, and make a cold boot. I know my keyboard is broken, but I don't 
think that it should kill the greeter.

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Touch seeded packages, which is subscribed to lightdm in Ubuntu.
https://bugs.launchpad.net/bugs/817186

Title:
  Entering a ridiculously long login/password crashes lightdm

Status in Light Display Manager:
  Fix Released
Status in lightdm package in Ubuntu:
  Fix Released

Bug description:
  TEST CASE:
  1. On the login screen, select an account
  2. In the password field enter a very very long string (I entered 0123456789 
repeated 100 times which is 1000 chars long)

  Result:
  The password field freezes (the UI is still working, but the password field 
is greyed, and never back to normal state) and this crash occurs.

  ProblemType: Crash
  DistroRelease: Ubuntu 11.10
  Package: lightdm 0.9.2-0ubuntu3
  ProcVersionSignature: Ubuntu 3.0.0-7.8-generic 3.0.0
  Uname: Linux 3.0.0-7-generic i686
  Architecture: i386
  Date: Wed Jul 27 15:00:06 2011
  Disassembly: => 0x390999:     Cannot access memory at address 0x390999
  ExecutablePath: /usr/sbin/lightdm
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20110209)
  ProcCmdline: lightdm
  ProcEnviron: PATH=(custom, no user)
  Signal: 5
  SourcePackage: lightdm
  Stacktrace:
   #0  0x00390999 in ?? ()
   No symbol table info available.
   Cannot access memory at address 0xbff447e0
  StacktraceTop: ?? ()
  Title: lightdm crashed with signal 5
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  mtime.conffile..etc.lightdm.lightdm.conf: 2011-07-25T23:56:44.233567

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