When beeing logged in remotely I also vainly tried to regain access to
the console by killing the user processes and the X11 process and later
I found with top that there was a lightdm Zombie process which was using
98% CPU.

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https://bugs.launchpad.net/bugs/986831

Title:
  system freezes for some seconds: Attempted to yield the CPU while in
  atomic or interrupt context

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