I also have the Y560 and can verify this is happening and I also get the same 
kernel panic message.  Over at askubuntu.com there are a few other people 
experiencing the same problem:
http://askubuntu.com/questions/38612/lenovo-y560-wont-boot-unless-its-on-ac-power/39752#39752
http://askubuntu.com/questions/35112/lenovo-y460-wont-boot-most-of-the-time-unless-plugged-in/39766#39766

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https://bugs.launchpad.net/bugs/775950

Title:
  fixing recursive fault but reboot is needed! upon boot without AC
  (only battery)

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