[Bug 1969162] Re: bad interaction between snapd and update-notifier when snapd package is being upgraded

[Łukasz Zemczak]

Hello Steve, or anyone else affected,

Accepted snapd into impish-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/snapd/2.54.3+21.10.1ubuntu0.3 in a
few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
impish to verification-done-impish. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-impish. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: snapd (Ubuntu)
       Status: In Progress => Fix Committed

** Changed in: snapd (Ubuntu Impish)
       Status: New => Fix Committed

** Tags added: verification-needed verification-needed-impish

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https://bugs.launchpad.net/bugs/1969162

Title:
  bad interaction between snapd and update-notifier when snapd package
  is being upgraded

Status in snapd package in Ubuntu:
  Fix Committed
Status in update-notifier package in Ubuntu:
  Invalid
Status in snapd source package in Impish:
  Fix Committed

Bug 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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