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[Launchpad Bug Tracker <1785739@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.4.0-135.161

---------------
linux (4.4.0-135.161) xenial; urgency=medium

  * 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>  Sun, 26 Aug 2018
23:56:50 -0400

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

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https://bugs.launchpad.net/bugs/1785739

Title:
  [Regression] APM Merlin boards fail to recover link after interface
  down/up

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Bionic:
  Fix Released
Status in linux source package in Cosmic:
  Fix Released

Bug description:
  [Impact]
  On an APM Merlin (X-Gene2) board, the onboard 1G interface fails to re-establish link when the interface is brought down and back up. Juju + MAAS provider does this after every install (so to configure a bridge), making this config unusable.

  This was actually a regression introduced by the fix for LP: #1632739
  in 4.4.0-48.69.

  [Test Case]
  1) From a remote system, start a ping to the IP address of the Merlin board's eth0 interface.
  2) On the merlin board: sudo ifdown eth0; sudo ifup eth0
  3) Ping should recover, but doesn't

  [Fix]
  commit 84a527a41f38a80353f185d05e41b021e1ff672b
  Author: Shaohui Xie <Shaohui.Xie@xxxxxxx>
  Date:   Tue May 10 17:42:26 2016 +0800

      net: phylib: fix interrupts re-enablement in phy_start

  [Regression Risk]
  The fix appears to be straightforward - don't enable interrupts on a phy that does not have a valid interrupt. Fixes are upstream, so any regressions should get upstream support for fixing.

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