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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1572630 Title: boot-time kernel panic introduced in 4.4.0-18, not present in 4.4.0-15 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-lts-xenial/+bug/1572630/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs