This bug was fixed in the package unattended-upgrades - 0.92ubuntu1.4
---------------
unattended-upgrades (0.92ubuntu1.4) yakkety; urgency=medium
* Complete the solution for the unattended-upgrades.service unit not
correctly working (LP: #1654600):
- d/rules : Remove the override_dh_installinit. The stop option is no longer
available so the command falls back to default. This is the normal
behavior so the override is not required
- d/unattended-upgrades.init : Add Default-Start runlevels, otherwise the
unattended-upgrades.service unit cannot be enabled on boot
- d/postinst : Cleanup the stop symlinks created by the wrong
override_dh_installinit. Without that, the systemd unit cannot be
enabled correctly.
Force disable the service before deb-systemd-helper runs so the old
symlink is not left dangling (workaround for Debian Bug #797108).
Force enable and start of the systemd unit to work around Debian Bug
#797108
which fails to enable systemd units correctly when WantedBy= statement
is changed which is the case here.
- d/unattended-upgrades.service : Fix the service so it runs correctly on
shutdown :
Remove DefaultDependencies=no : Breaks normal shutdown dependencies
Set After= to network.target and local-fs.target. Since our service is
now ExecStop, it will run before network and local-fs become
unavailable.
Add RequiresMountsFor=/var/log /var/run /var/lib /boot : Necessary if
/var is a separate file system. Set WantedBy= to multi-user.target
- Add DEP8 tests to verify the following :
Verify that the unattended-upgrades.service unit is enabled and started.
Verify that InstallOnShutdown works when configured.
-- Louis Bouchard <louis.bouch...@ubuntu.com> Tue, 04 Apr 2017
18:31:42 +0200
** Changed in: unattended-upgrades (Ubuntu Yakkety)
Status: Fix Committed => Fix Released
** Changed in: unattended-upgrades (Ubuntu Xenial)
Status: Fix Committed => Fix Released
--
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Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1654600
Title:
unattended-upgrade-shutdown hangs when /var is a separate filesystem
Status in unattended-upgrades package in Ubuntu:
Fix Released
Status in unattended-upgrades source package in Xenial:
Fix Released
Status in unattended-upgrades source package in Yakkety:
Fix Released
Status in unattended-upgrades source package in Zesty:
Fix Released
Status in unattended-upgrades package in Debian:
Fix Released
Bug description:
[SRU justification]
This fix is needed to make sure that the system does not hang on shutdown
when /var is a speparate file system
[Impact]
System can hang up to 10 minutes if not fixed.
[Fix]
Change the systemd unit's ExecStart to an ExecStop so the unit is correctly
sequenced.
Change WantedBy to multi-user.target. This requires working around Debian Bug
#797108 which causes the new unit not to be enabled.
Remove the unneeded override_dh_isntallinit
Add Default-Start levels to the SysV initscript
Improve DEP8 testing
[Test Case]
In a VM with /var separated from the / file system, shutdown the VM. It will
hang for 10 minutes
[Regression]
Upgrade has been tested on Xenial, Yakkety, Zesty. do-release-upgrade has
been tested from Trusty to Xenial. All behave as expected.
A change of behavior may occur now that the systemd unit is correctly
enabled, which would make functionalities like InstallOnShutdown to
work as expected whereas it could have been broken previously. This
cannot be considered as a regression as it is expected behavior.
Shutdown may be slowed down as it now correctly depends on /var and
/boot to be available so the unit will run earlier than previously.
[Original description of the problem]
The systemd unit file unattended-upgrades.service is used to stop a running
unattended-upgrade
process during shutdown. This unit file is running together with all
filesystem
unmount services.
The unattended-upgrades service checks if the lockfile for unattended-upgrade
(in /var/run) exists, and if it does, there is an unattended-upgrade in
progress
and the service will wait until it finishes (and therefore automatically wait
at
shutdown).
However, if /var is a separate filesystem, it will get unmounted even though
/var/run
is a tmpfs that's still mounted on top of the /var/run directory in the /var
filesystem.
The unattended-upgrade script will fail to find lockfile, sleeps for 5
seconds, and
tries to check the lockfile again. After 10 minutes (the default timeout), it
will finally
exit and the system will continue shutdown.
The problem is the error handling in
/usr/share/unattended-upgrades/unattended-upgrade-shutdown
where it tries to lock itself:
while True:
res = apt_pkg.get_lock(options.lock_file)
logging.debug("get_lock returned %i" % res)
# exit here if there is no lock
if res > 0:
logging.debug("lock not taken")
break
lock_was_taken = True
The function apt_pkg.get_lock() either returns a file descriptor, or -1 on an
error.
File descriptors are just C file descriptors, so they are always positive
integers.
The code should check the result to be negative, not positive. I have
attached a patch
to reverse the logic.
Additional information:
1)
Description: Ubuntu 16.04.1 LTS
Release: 16.04
2)
unattended-upgrades:
Installed: 0.90ubuntu0.3
Candidate: 0.90ubuntu0.3
Version table:
*** 0.90ubuntu0.3 500
500 http://nl.archive.ubuntu.com/ubuntu xenial-updates/main amd64
Packages
500 http://nl.archive.ubuntu.com/ubuntu xenial-updates/main i386
Packages
100 /var/lib/dpkg/status
0.90 500
500 http://nl.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
500 http://nl.archive.ubuntu.com/ubuntu xenial/main i386 Packages
3)
Fast reboot
4)
Very slow reboot (after a 10 minutes timeout)
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/unattended-upgrades/+bug/1654600/+subscriptions
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