[Bug 1515513] Re: /boot/initrd.img-*.old-dkms files left behind

[Brian Murray]

The verification of this has failed as the fix was incorrect.

Removing linux-image-4.10.0-19-generic (4.10.0-19.21) ...
Examining /etc/kernel/prerm.d.
run-parts: executing /etc/kernel/prerm.d/dkms 4.10.0-19-generic /boot/vmlinuz-4.10.0-19-generic
removed '/boot/initrd.img-4.10.0-19-generic.old-dkms'
dkms: removing: r8168 8.043.02 (4.10.0-19-generic) (x86_64)

-------- Uninstall Beginning --------
Module:  r8168
Version: 8.043.02
Kernel:  4.10.0-19-generic (x86_64)
-------------------------------------

Status: Before uninstall, this module version was ACTIVE on this kernel.

r8168.ko:
 - Uninstallation
   - Deleting from: /lib/modules/4.10.0-19-generic/updates/dkms/
 - Original module
   - No original module was found for this module on this kernel.
   - Use the dkms install command to reinstall any previous module version.

depmod...

Backing up initrd.img-4.10.0-19-generic to /boot/initrd.img-4.10.0-19-generic.old-dkms
Making new initrd.img-4.10.0-19-generic
(If next boot fails, revert to initrd.img-4.10.0-19-generic.old-dkms image)
update-initramfs...

DKMS: uninstall completed.
Examining /etc/kernel/postrm.d .

The .old-dkms file is removed before a new one is created (see the
Backing up bits). So the remove_initrd_backup run needs to be reordered
for after the dkms call.

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https://bugs.launchpad.net/bugs/1515513

Title:
  /boot/initrd.img-*.old-dkms files left behind

Status in dkms package in Ubuntu:
  Fix Released
Status in initramfs-tools package in Ubuntu:
  Confirmed
Status in dkms source package in Xenial:
  Fix Committed
Status in initramfs-tools source package in Xenial:
  New
Status in dkms source package in Zesty:
  Fix Committed
Status in initramfs-tools source package in Zesty:
  New
Status in dkms package in Debian:
  New

Bug description:
  [Impact]
  If a dkms package is installed which has REMAKE_INITRD or the same setting has be manually configured by a user then when a kernel is removed its possible for an ".old-dkms" file to be left in /boot with no associated kernel.

  [Test Case]
  On a system with two old kernels and one new kernel available in -updates:
  1) install r8168-dkms
  2) install the dkms module for the old kernel e.g. 'sudo dkms install -m r8168 -v 8.041.00 -k 4.4.0-31-generic'
  3) upgrade your kernel e.g. "sudo apt install linux-image-generic'
  4) sudo apt autoremove
  5) observe something like "initrd.img-4.4.0-31-generic.old-dkms" in /boot without a corresponding "initrd.img-4.4.0-31-generic"

  With the version of dkms in -proposed, the .old-dkms file will be
  removed when the kernel is auto removed.

  [Regression Potential]
  Somebody out there might expect the .old-dkms file to be kept, but that seems like an odd expectation.

  One notices *.old-dkms files being left behind still sitting on the
  disk after purging the related kernel. This can cause /boot to become
  full, and when it gets really bad, even sudo apt-get autoremove won't
  fix the problem - only deleting the old-dkms files manually solves the
  problem.

  Note:  Filling up the /boot partition causes updates to fail.

  ProblemType: BugDistroRelease: Ubuntu 15.04
  Package: dkms 2.2.0.3-2ubuntu3.3
  ProcVersionSignature: Ubuntu 3.19.0-28.30-generic 3.19.8-ckt5
  Uname: Linux 3.19.0-28-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.7
  Architecture: amd64
  CurrentDesktop: KDE
  Date: Thu Nov 12 08:17:10 2015
  InstallationDate: Installed on 2015-05-05 (190 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  PackageArchitecture: allSourcePackage: dkms
  UpgradeStatus: No upgrade log present (probably fresh install)

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