This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:

apport-collect 1709511

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

** Tags added: xenial

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  Kernel 4.4.0-89 panics on boot on xenial

Status in linux package in Ubuntu:

Bug description:
  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 

  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

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