There is an upstream fix for this issue.

First introduced upstream in branch : v4.6-rc1

---
commit 897bb0c7f1ea82d7cc882b19790b5e1df00ffc29
Author: Thomas Gleixner <t...@linutronix.de>
Date:   Sat Mar 19 11:30:33 2016 +0100

    blk-mq: Use proper cpumask iterator
    
    queue_for_each_ctx() iterates over per_cpu variables under the assumption 
that
    the possible cpu mask cannot have holes. That's wrong as all cpumasks can 
have
    holes. In case there are holes the iteration ends up accessing uninitialized
    memory and crashing as a result.
    
    Replace the macro by a proper for_each_possible_cpu() loop and drop the 
unused
    macro blk_ctx_sum() which references queue_for_each_ctx().
---

Eric

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https://bugs.launchpad.net/bugs/1572630

Title:
  boot-time kernel panic introduced in 4.4.0-18, not present in 4.4.0-15

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