** Attachment added: "version.log"

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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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