I was able to reproduce this bug.  The panic not only happens at install
time, but also if you install the affected kernel on an already
installed system.

I'm in the process of bisecting the issue now.   The bug also exists in
upstream 4.2 final.

* Panic happens with latest Vivid kernel(3.19.0-28)
* Does not happen with 3.19.0-15
* Does not happen with upstream 3.19.8-ckt6
* Panic happens with upstream 4.2.

I'll update the bug with my progress.

** Changed in: linux (Ubuntu Wily)
     Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Changed in: linux (Ubuntu Wily)
       Status: Confirmed => In Progress

** Also affects: linux (Ubuntu Vivid)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Vivid)
       Status: New => In Progress

** Changed in: linux (Ubuntu Vivid)
   Importance: Undecided => High

** Changed in: linux (Ubuntu Vivid)
     Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

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https://bugs.launchpad.net/bugs/1495983

Title:
  [Hyper-V] kernel panic occurs when installing Ubuntu Server 15.10 x32

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