** Description changed:
+ [Impact]
+
+ On a release upgrade from impish to jammy, dbus postinst hangs for 10
+ minutes.
+
+ [Test Case]
+
+ Testing the fix itself:
+
+ On a minimal impish system (created with autopkgtest-buildvm), install the
snapd from -proposed and run:
+ $ sudo snap install canonical-livepatch
+ $ apt list -a snapd
+ [shows the impish proposed version is used]
+ $ sudo sed -i 's/impish/jammy/' /etc/apt/sources.list
+ $ sudo apt update
+ $ apt list -a snapd
+ [shows the PPA version as the one that will be upgraded to]
+ $ sudo apt full-upgrade -y
+
+ This should pass
+
+ Another test would be simply trying an upgrade from impish to jammy as
+ per the original report.
+
+ [Regression Potential]
+
+ TBD
+
+ [Original Description]
+
On a release upgrade from impish to jammy, I noticed that the dbus
postinst hung for 10 minutes. It hung trying to make two calls to
canonical-livepatch via /usr/share/update-notifier/notify-reboot-
required: first a call to /snap/bin/canonical-livepatch kernel-upgrade-
required which hung for ~5 minutes, then a call to /snap/bin/canonical-
livepatch status which hung for another ~5 minutes.
An strace of the second process showed that canonical-livepatch was
looping trying to connect to /run/snapd.socket:
[pid 769177] connect(3, {sa_family=AF_UNIX,
sun_path="/run/snapd.socket"}, 20) = -1 ECONNREFUSED (Connection
refused)
This was not attached to anything, because the snapd package was among
those in the current apt transaction, and was currently not in a
configured state:
root 756701 0.0 0.0 24144 12556 pts/20 Ss+ 17:26 0:00 |
| \_ /usr/bin/dpkg --force-overwrite --status-fd 57 --no-
triggers --configure apparmor:amd64 openssl:amd64 ca-certificates:all
libmd0:amd64 libmd0:i386 libbsd0:amd64 libbsd0:i386 libedit2:amd64
libtinfo6:i386 libedit2:i386 libcbor0.8:amd64 libfido2-1:amd64
libkrb5support0:amd64 libkrb5-3:amd64 libgssapi-krb5-2:amd64 openssh-
client:amd64 liblzo2-2:amd64 squashfs-tools:amd64 libcap2:amd64
libkmod2:amd64 udev:amd64 libapparmor1:amd64 libapparmor1:i386
libdbus-1-3:amd64 libcap2:i386 libzstd1:i386 libsystemd0:i386
libdbus-1-3:i386 dbus:amd64 libpam-systemd:amd64 dbus-user-session:amd64
snapd:amd64
iU snapd 2.55.3+22.04 amd64 Daemon and tooling that
enable snap packages
This should probably be fixed by not stopping snapd in the prerm
(dh_systemd_start --restart-after-upgrade).
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https://bugs.launchpad.net/bugs/1969162
Title:
bad interaction between snapd and update-notifier when snapd package
is being upgraded
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