[Bug 2109419] [NEW] mDNS required avahi-daemon.service restart after resume

[Daniel Tang]

Public bug reported:

After suspending and resuming my desktop, my tablet could not resolve
its hostname over mDNS. `getent hosts daniel-desktop3.local` has no
output. Wireshark on the desktop captured incoming mDNS packets but no
outgoing response. Disconnecting/reconnecting the desktop's ethernet in
NetworkManager generated log output but wasn't a fix. `systemctl restart
avahi-daemon.service` worked around the problem.

$ lsb_release -rd
Description:    Ubuntu 24.10
Release:        24.10

$ apt-cache policy avahi-daemon 
avahi-daemon:
  Installed: 0.8-13ubuntu6
  Candidate: 0.8-13ubuntu6
  Version table:
 *** 0.8-13ubuntu6 500
        500 https://gpl.savoirfairelinux.net/pub/mirrors/ubuntu oracular/main amd64 Packages
        100 /var/lib/dpkg/status

# What you expected to happen

My desktop should continue to be resolvable over mDNS to other computers
after a suspend and resume.

# What happened instead

Other computers were unable to resolve my desktop after mDNS.

ProblemType: Bug
DistroRelease: Ubuntu 24.10
Package: avahi-daemon 0.8-13ubuntu6
Uname: Linux 6.15.0-rc2 x86_64
ApportVersion: 2.30.0-0ubuntu4.2
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: KDE
Date: Sat Apr 26 20:32:44 2025
InstallationDate: Installed on 2022-11-05 (904 days ago)
InstallationMedia: Ubuntu 22.10 "Kinetic Kudu" - Release amd64 (20221020)
SourcePackage: avahi
UpgradeStatus: Upgraded to oracular on 2025-01-02 (114 days ago)

** Affects: avahi (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug oracular wayland-session

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https://bugs.launchpad.net/bugs/2109419

Title:
  mDNS required avahi-daemon.service restart after resume

Status in avahi package in Ubuntu:
  New

Bug description:
  After suspending and resuming my desktop, my tablet could not resolve
  its hostname over mDNS. `getent hosts daniel-desktop3.local` has no
  output. Wireshark on the desktop captured incoming mDNS packets but no
  outgoing response. Disconnecting/reconnecting the desktop's ethernet
  in NetworkManager generated log output but wasn't a fix. `systemctl
  restart avahi-daemon.service` worked around the problem.

  $ lsb_release -rd
  Description:    Ubuntu 24.10
  Release:        24.10

  $ apt-cache policy avahi-daemon 
  avahi-daemon:
    Installed: 0.8-13ubuntu6
    Candidate: 0.8-13ubuntu6
    Version table:
   *** 0.8-13ubuntu6 500
          500 https://gpl.savoirfairelinux.net/pub/mirrors/ubuntu oracular/main amd64 Packages
          100 /var/lib/dpkg/status

  # What you expected to happen

  My desktop should continue to be resolvable over mDNS to other
  computers after a suspend and resume.

  # What happened instead

  Other computers were unable to resolve my desktop after mDNS.

  ProblemType: Bug
  DistroRelease: Ubuntu 24.10
  Package: avahi-daemon 0.8-13ubuntu6
  Uname: Linux 6.15.0-rc2 x86_64
  ApportVersion: 2.30.0-0ubuntu4.2
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: KDE
  Date: Sat Apr 26 20:32:44 2025
  InstallationDate: Installed on 2022-11-05 (904 days ago)
  InstallationMedia: Ubuntu 22.10 "Kinetic Kudu" - Release amd64 (20221020)
  SourcePackage: avahi
  UpgradeStatus: Upgraded to oracular on 2025-01-02 (114 days ago)

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