Public bug reported:

After applying the 4.4.0-89 kernel update, I get a panic on boot.

4.4.0-87 boots normally.


I expected that 4.4.0-89 would boot normally (as 4.4.0-87) instead of crashing.


Systemd displays an announcement: "Starting udev Wait for Complete Device 
Initialization...", then I get:

  * "kobject: can not set name properly!"
  * "BUG: unable to handle kernel null pointer dereference at 00000000
  * A kernel error backtrace

Part of the backtrace is (I'm having to enter this from a video):

Call Trace:
  [ffffffff81258ff3] ep_alloc+0x43/0xe0
  [ffffffff81259162] SyS_epoll_create1+0x42/0xe0
  [ffffffff81841f32] entry_SYSCALL_64_fastpath+0x16/0x71

RIP [ffffffff811ed65b] kmem_cache_alloc_trace+0x7b/0x1f0

Kernel panic - not syncing: CRED: put_cred_rcu() sees ffff880231fc3cc0
with usage -1


lsb_release -rd:

Description:    Ubuntu 16.04.3 LTS
Release:        16.04

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1709511

Title:
  Kernel 4.4.0-89 panics on boot on xenial

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