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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