The hang can also occur when unattended-upgrades is started by apt's
timer (u-u is modified to help hitting it at the right time):
$ cat reproduce-apt-ran-uu.sh
#!/bin/sh
set -e
apt update
apt upgrade -y
echo 'Unattended-Upgrade::Allowed-Origins::
"${distro_id}:${distro_codename}-updates";' >
/etc/apt/apt.conf.d/51unattended-upgrades-updates-too
case $(lsb_release -c -s) in
bionic)
apt install --allow-downgrades -y apport=2.20.9-0ubuntu7
snapd=2.32.5+18.04
;;
esac
grep -q 'sleep' /usr/bin/unattended-upgrade || sed -i 's/import
atexit/import time\nimport atexit/;s/res = cache\.commit/time.sleep(5)\n
res = cache.commit/' /usr/bin/unattended-upgrade
rm -f /var/lib/apt/periodic/u*
apt upgrade -d -y
service apt-daily-upgrade start &
sleep 7
reboot
@juliank In https://bugs.launchpad.net/ubuntu/+source/unattended-
upgrades/+bug/1690980/comments/50 you suggested inhibiting shutdown for
the commit operations only in u-u, but IMO that would still leave the
race condition open where the user can start shutdown between commits
thus possibly hanging the system with the issue reported in this bug.
One option (1) would be u-u starting the inhibition at the beginning of its run
via dbus, the other (2) would be apt.systemd.daily calling u-u with the
systemd-inhibit wrapper.
2 would be cleaner and u-u would not have to grow dependency on Python3 dbus
modules.
Apt.systemd.daily calling u-u with systemd-inhibit would not back
shutdown for long on average since it is already unlikely to hit an
upgrade with a shutdown, but in the worst case installing all bionic
security updates can take 10-s of minutes. Again, this is a highly
unlikely scenario, but if users are hitting that u-u could still get
support for monitoring inhibited shutdown requests on dbus and
gracefully stop without applying all updates.
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac
/autopkgtest-bionic/bionic/amd64/u/unattended-
upgrades/20181010_011153_2b8c7@/log.gz
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https://bugs.launchpad.net/bugs/1778219
Title:
unattended-upgrades hangs on shutdown, leaves system in a broken state
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