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[Launchpad Bug Tracker <1766823@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux-kvm - 4.4.0-1033.39

---------------
linux-kvm (4.4.0-1033.39) xenial; urgency=medium

  * linux-kvm: 4.4.0-1033.39 -proposed tracker (LP: #1788771)

  * zram module not found in 4.4/4.15 KVM kernel (LP: #1766823)
    - [Config]: enable CONFIG_ZRAM
    - [Config]: enable CONFIG_ZRAM (continued)

  [ Ubuntu: 4.4.0-135.161 ]

  * linux: 4.4.0-135.161 -proposed tracker (LP: #1788766)
  * [Regression] APM Merlin boards fail to recover link after interface down/up
    (LP: #1785739)
    - net: phylib: fix interrupts re-enablement in phy_start
    - net: phy: fix phy_start to consider PHY_IGNORE_INTERRUPT
  * qeth: don't clobber buffer on async TX completion (LP: #1786057)
    - s390/qeth: don't clobber buffer on async TX completion
  * nvme: avoid cqe corruption (LP: #1788035)
    - nvme: avoid cqe corruption when update at the same time as read
  * CacheFiles: Error: Overlong wait for old active object to go away.
    (LP: #1776254)
    - cachefiles: Fix missing clear of the CACHEFILES_OBJECT_ACTIVE flag
    - cachefiles: Wait rather than BUG'ing on "Unexpected object collision"
  * fscache cookie refcount updated incorrectly during fscache object allocation
    (LP: #1776277) // fscache cookie refcount updated incorrectly during fscache
    object allocation (LP: #1776277)
    - fscache: Fix reference overput in fscache_attach_object() error handling
  * FS-Cache: Assertion failed: FS-Cache: 6 == 5 is false (LP: #1774336)
    - Revert "UBUNTU: SAUCE: CacheFiles: fix a read_waiter/read_copier race"
    - fscache: Allow cancelled operations to be enqueued
    - cachefiles: Fix refcounting bug in backing-file read monitoring
  * linux-cloud-tools-common: Ensure hv-kvp-daemon.service starts before
    walinuxagent.service (LP: #1739107)
    - [Debian] hyper-v -- Ensure that hv-kvp-daemon.service starts before
      walinuxagent.service

 -- Khalid Elmously <khalid.elmously@xxxxxxxxxxxxx>  Mon, 27 Aug 2018
00:14:00 -0400

** Changed in: linux-kvm (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1766823

Title:
  zram module not found in 4.4/4.15 KVM kernel

Status in ubuntu-kernel-tests:
  Fix Released
Status in linux-kvm package in Ubuntu:
  In Progress
Status in linux-kvm source package in Xenial:
  Fix Released
Status in linux-kvm source package in Bionic:
  Fix Released

Bug description:
  == Justification ==
  In the Xenial / Bionic KVM kernel, the CONFIG_ZRAM was not set, it's impossible for users to use zram module on it. And the ubuntu_zram_smoke_test regression test is failing due to the missing  module.

  == Test ==
  Before enabling CONFIG_ZRAM and the related configs, the zram module cannot be found.
  After that, the zram module can be inserted and pass the ubuntu_zram_smoke_test.

  Test kernels could be found here:
  http://people.canonical.com/~phlin/kernel/lp-1766823-zram/

  == Fix ==
  [bionic/linux-kvm][xenial/linux-kvm][SRU][PATCH] UBUNTU: [Config]: enable CONFIG_ZRAM

  == Regression Potential ==
  Minimal.
  No code changes, just a config changes without disabling any other configs.


  ------

  The ubuntu_zram_smoke_test will fail due to the lack of the zram
  module.

  07:32:19 DEBUG| Running '/home/ubuntu/autotest/client/tests/ubuntu_zram_smoke_test/ubuntu_zram_smoke_test.sh'
  07:32:19 ERROR| [stderr] modprobe: FATAL: Module zram not found in directory /lib/modules/4.15.0-1008-kvm
  07:32:19 DEBUG| [stdout] FAILED: cannot load zram module
  07:32:19 ERROR| Exception escaping from test:

  There is no zram config in the Bionic KVM kernel config file.
  $ grep -i zram debian.kvm/config/config.common.ubuntu
  $

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-1008-kvm 4.15.0-1008.8
  ProcVersionSignature: User Name 4.15.0-1008.8-kvm 4.15.17
  Uname: Linux 4.15.0-1008-kvm x86_64
  NonfreeKernelModules: signpost
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  Date: Wed Apr 25 07:32:47 2018
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=C.UTF-8
   SHELL=/bin/bash
  SourcePackage: linux-kvm
  UpgradeStatus: No upgrade log present (probably fresh install)

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