On Tue, Mar 27, 2018 at 11:46 PM, Steve Langasek
<steve.langa...@canonical.com> wrote:
> Why does the update-manager upload include this code?:
>
> + running_kernel_version = subprocess.check_output(
> + ["uname", "-r"], universal_newlines=True).rstrip()
> + self.running_kernel_pkgs_regexp = re.compile("(" + "|".join(
> + [("^" + p + ".*" + running_kernel_version)
> + if not p.startswith(".*") else (running_kernel_version + p)
> + for p in apt_versioned_kernel_pkgs]) + ")")
> [...]
> + if (pkg.is_auto_removable and
> + (cache.versioned_kernel_pkgs_regexp and
> + cache.versioned_kernel_pkgs_regexp.match(pkg.name) and
> + not cache.running_kernel_pkgs_regexp.match(pkg.name))):
> + kernel_autoremove_pkgs.append(pkg)
> + pkg.mark_delete()
>
> apt already has an implementation in /etc/kernel/postinst.d/apt-auto-
> removal which ensures that the currently-running kernel is not
> autoremoved. Why are you duplicating this functionality in update-
> manager?
The code in apt ensures that the kernel running at the time the last
kernel was installed is not offered for autoremoval but it does not
protect the _currently_ running kernel. The issue is tracked in LP:
#1615381 and unattended-upgrades already uses the same method to
protect the _current_ running kernel.
The proper fix for LP: #1615381 would be too intrusive in apt for
inclusion in Bionic at this stage of the cycle.
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https://bugs.launchpad.net/bugs/1675079
Title:
16.04 LTS Partition /boot fills up with Kernel images, gets underwear
in a twist
Status in unattended-upgrades package in Ubuntu:
Fix Released
Status in update-manager package in Ubuntu:
Fix Released
Status in unattended-upgrades source package in Xenial:
New
Status in update-manager source package in Xenial:
New
Status in unattended-upgrades source package in Artful:
New
Status in update-manager source package in Artful:
Incomplete
Bug description:
[Impact]
* Update-manager and unattended-upgrades install many kernel packages during
the lifetime of a release but does not remove them automatically leading to
those packages filling disk space potentially completely filling /boot and
making the system unable to install updates or even boot.
* Stable release users are impacted by this bug for years and their systems
already collected many autoremovable unused kernel packages, thus they would
benefit from backporting the fix greatly.
* The bug is fixed by removing autoremovable (not currently booted) kernel
packages when running unattended-upgrades or update-manager. Update manager
offers the kernel removals when there are other updates to be installed.
[Test Case]
1. Install kernel packages to be removed, mark them auto-installed
and run apt's kernel hook script to make apt consider them
autoremovable:
sudo apt install -y linux-image-extra-4.4.0-92-generic
linux-image-extra-4.4.0-93-generic
sudo apt-mark auto linux-image-extra-4.4.0-92-generic
linux-image-extra-4.4.0-93-generic
sudo /etc/kernel/postinst.d/apt-auto-removal
2. Also downgrade a package to be upgraded:
sudo apt-get install -y ca-certificates=20160104ubuntu1
3. (update-manager). Run update-manager and observe that kernel
packages are offered for removal in Details of updates.
sudo update-manager
4. (update-manager) Click on Install Now and observe that the kernel
packages are removed.
3. (unattended-upgrades) Run unattended-upgrades manually and observe
the removal of the autoremovable kernel packages:
sudo unattended-upgrade -v
[Regression Potential]
The change may cause update-manager or unattanded-upgrades to remove
used kernel packages or fail to install other package updates.
[Other Info]
The unattended-upgrades fix is uploaded with many other fixes and
those may cause regressions in other areas in unattended-upgrades.
[Original bug text]
On a 16.04LTS system, the /boot partition will eventually fill with
Kernel images, until the point where "apt-get autoremove" can't
complete.
This issue has previously been reported as fixed, but it is not fixed:
https://bugs.launchpad.net/ubuntu/+source/unattended-upgrades/+bug/1357093
Generally what I see is the final kernel image that fills the drive is
incompletely installed (the header package does not make it). "apt-
get autoremove" tries to work, but fails. I must manually remove
kernel images to free enough space.
I see this on a machine used by my elderly parents, where 'Download
and install updates automatically' is set. And on my home machines,
where the setting is elsewhere.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/unattended-upgrades/+bug/1675079/+subscriptions
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