The 3.12 kernel hung this morning, as in earlier instances. These are a
few observations from a remote login (ssh) from another system on the
LAN:

* No process was consuming an inordinate amount of CPU, unlike previous 
migration/0 and migration/1 processes
* No process or thread was doing any significant I/O
* When Alt-SysReq-K was pressed on the hung system, no response was observed. I 
expected all processes on the X server's virtual console to be killed.
* After a "shutdown -r -t10 now" was executed from the remote login, ps(1) 
revealed that the X server was in WCHAN "exit" and its STATUS was "Ds." The 
system did not reboot.
* Alt-SysReq-R, I, E, S, U, B rebooted the system

I am now running 3.2.0-55-generic until I receive further diagnosis
instructions.

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https://bugs.launchpad.net/bugs/1223055

Title:
  System Hangs With Kernel Migration Processes Consuming 100% CPU

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