[Bug 1527710] Re: apt-get update triggers asynchronous task

[ChristianEhrhardt]

debdiff to show the suggested change, this is in no way an upload to be sponsored yet as it needs way more testing.
Just FYI so you see what was changed

** Patch added: "xenial_update-notifier.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/update-notifier/+bug/1527710/+attachment/4537011/+files/xenial_update-notifier.debdiff

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to update-notifier in Ubuntu.
https://bugs.launchpad.net/bugs/1527710

Title:
  apt-get update triggers asynchronous task

Status in update-notifier package in Ubuntu:
  Incomplete

Bug description:
  I have a work flow (curtin installation) that does something to the affect of:
   mount $DEVICE /target 
   mount --bind /dev /target/dev
   chroot /target apt-get update
   umount /target/dev
   umount /target/

  With xenial, I started having failures on the umount of /target/dev because of open file handles.
  An lsof showed me that /usr/lib/update-notifier/update-motd-updates-available had open file handles on /dev/null and apt-check had handles on /dev/urandom.

  I admit that part of this is my fault, because we do a selective apt-
  get update (only pulling deb sources, not deb-src).  As a result, when
  /usr/lib/update-notifier/update-motd-updates-available there was
  possibly more work to be done then would normally have to be done...
  not sure on that.

  For the record, what we do is in http://bazaar.launchpad.net/~curtin-
  dev/curtin/trunk/view/head:/curtin/util.py#L486 (apt_update method).

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: update-notifier-common 3.164
  ProcVersionSignature: User Name 4.3.0-2.11-generic 4.3.0
  Uname: Linux 4.3.0-2-generic x86_64
  ApportVersion: 2.19.3-0ubuntu2
  Architecture: amd64
  Date: Fri Dec 18 18:02:41 2015
  Ec2AMI: ami-0000072f
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: None
  Ec2Ramdisk: None
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: update-notifier
  UpgradeStatus: No upgrade log present (probably fresh install)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/update-notifier/+bug/1527710/+subscriptions