** Also affects: ubuntu-kernel-tests
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1793464

Title:
  Kernel panic after the ubuntu_nbd_smoke_test on Xenial kernel

Status in ubuntu-kernel-tests:
  New
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  This issue can be reproduced on AMD64 KVM //bare-metal node, s390x zKVM node
   
  The test itself will pass, but the system will hang after a few second.

  Steps:
    1. Deploy a node with 4.4 Xenial
    2. Run the ubuntu_nbd_smoke_test

  If you have access to the console, you will see that this system
  actually bumped into a kernel panic:

   Unable to handle kernel pointer dereference in virtual kernel address space
   failing address: 000003ff802c1000 TEID: 000003ff802c1803
   Fault in home space mode while using kernel ASCE.
   Log here: https://pastebin.ubuntu.com/p/dNmtvbGjmz/

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-136-generic 4.4.0-136.162
  ProcVersionSignature: Ubuntu 4.4.0-136.162-generic 4.4.144
  Uname: Linux 4.4.0-136-generic s390x
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 
2: ls: cannot access '/dev/snd/': No such file or directory
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: s390x
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 
not found.
  Date: Thu Sep 20 03:46:00 2018
  HibernationDevice: RESUME=UUID=ca468a9c-9563-442c-85c6-6055e800a66e
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  Lspci:
   
  Lsusb: Error: command ['lsusb'] failed with exit code 1:
  PciMultimedia:
   
  ProcFB: Error: [Errno 2] No such file or directory: '/proc/fb'
  ProcKernelCmdLine: root=UUID=b65b756a-ba4e-4c53-aa32-0db2bdb50bb3 
crashkernel=196M
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-136-generic N/A
   linux-backports-modules-4.4.0-136-generic  N/A
   linux-firmware                             1.157.20
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)

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