Ok tracked this down to an issue with the RSB stuffer.  I have applied a
group of upstream fixes in this area and this has resolved the lockups
in my testing.  Could you do a final confirmation with the below kernel
to make sure this also fixes your issues:

    http://people.canonical.com/~apw/lp1747507-artful/

Please report any testing back here.

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https://bugs.launchpad.net/bugs/1747507

Title:
  starting VMs causing retpoline4 to reboot

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