[Bug 1820584] Re: seahorse assert failure: seahorse: glib-watch.c:195: timeout_update: Assertion `!t->dead' failed.

[Matthew Ruffell]

This bug is triggered when I went to upgrade the avahi packages as part of a
daily upgrade in focal:

$ sudo apt list --upgradable
Listing... Done
avahi-autoipd/focal 0.7-4ubuntu7 amd64 [upgradable from: 0.7-4ubuntu6]
avahi-daemon/focal 0.7-4ubuntu7 amd64 [upgradable from: 0.7-4ubuntu6]
avahi-utils/focal 0.7-4ubuntu7 amd64 [upgradable from: 0.7-4ubuntu6]
libavahi-client3/focal 0.7-4ubuntu7 amd64 [upgradable from: 0.7-4ubuntu6]
libavahi-common-data/focal 0.7-4ubuntu7 amd64 [upgradable from: 0.7-4ubuntu6]
libavahi-common3/focal 0.7-4ubuntu7 amd64 [upgradable from: 0.7-4ubuntu6]
libavahi-core7/focal 0.7-4ubuntu7 amd64 [upgradable from: 0.7-4ubuntu6]
libavahi-glib1/focal 0.7-4ubuntu7 amd64 [upgradable from: 0.7-4ubuntu6]
libavahi-ui-gtk3-0/focal 0.7-4ubuntu7 amd64 [upgradable from: 0.7-4ubuntu6]

When the dpkg hook is run to restart the avahi service, seahorse looses
connection to the avahi-daemon:

Apr 14 16:55:10 ubuntu avahi-daemon[694]: Got SIGTERM, quitting.
Apr 14 16:55:10 ubuntu avahi-daemon[694]: Leaving mDNS multicast group on interface enp1s0.IPv6 with address fe80::daf8:4688:8169:19b5.
Apr 14 16:55:10 ubuntu avahi-daemon[694]: Leaving mDNS multicast group on interface enp1s0.IPv4 with address 192.168.122.34.
Apr 14 16:55:10 ubuntu avahi-daemon[694]: Leaving mDNS multicast group on interface lo.IPv6 with address ::1.
Apr 14 16:55:10 ubuntu avahi-daemon[694]: Leaving mDNS multicast group on interface lo.IPv4 with address 127.0.0.1.
Apr 14 16:55:10 ubuntu seahorse[2622]: failure communicating with to avahi: Daemon connection failed

>From there, seahorse hits the assert at:
https://github.com/lathiat/avahi/blob/master/avahi-common/simple-
watch.c#L273-L282

Apr 14 16:55:10 ubuntu org.gnome.seahorse.Application[2622]: seahorse:
glib-watch.c:195: timeout_update: Assertion `!t->dead' failed.

The avahi daemon continues to stop, and then restarts:

Apr 14 16:55:10 ubuntu dbus-daemon[713]: [system] Activating via systemd: service name='org.freedesktop.Avahi' unit='dbus-org.freedesktop.Avahi.service' requested by ':1.114' (uid=0 pid=789 comm="/usr/sbin/cups-browsed " label="/usr/sbin/cups-browsed (enforce)")
Apr 14 16:55:10 ubuntu systemd[1]: Stopping Avahi mDNS/DNS-SD Stack...
Apr 14 16:55:10 ubuntu avahi-daemon[694]: avahi-daemon 0.7 exiting.
Apr 14 16:55:10 ubuntu systemd[1]: avahi-daemon.service: Succeeded.
Apr 14 16:55:10 ubuntu systemd[1]: Stopped Avahi mDNS/DNS-SD Stack.
Apr 14 16:55:10 ubuntu systemd[1]: Starting Avahi mDNS/DNS-SD Stack...

Then apport goes and makes a crash report:

Apr 14 16:55:11 ubuntu avahi-daemon[4364]: Server startup complete. Host name is ubuntu.local. Local service cookie is 3169540412.
Apr 14 16:55:11 ubuntu systemd[1529]: Starting Notification regarding a crash report...
Apr 14 16:55:11 ubuntu update-notifier-crash[4516]: /usr/bin/whoopsie
Apr 14 16:55:11 ubuntu update-notifier-crash[4519]: seahorse

The next interesting thing is, if you launch seahorse, then restart
avahi-daemon.service, it prints an error but does not crash:

$ seahorse
$ sudo systemctl restart avahi-daemon.service
(seahorse:6477): seahorse-WARNING **: 17:09:53.344: failure communicating with to avahi: Daemon connection failed

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https://bugs.launchpad.net/bugs/1820584

Title:
  seahorse assert failure: seahorse: glib-watch.c:195: timeout_update:
  Assertion `!t->dead' failed.

Status in avahi package in Ubuntu:
  Confirmed

Bug description:
  ---------------------------------------------------------
  Description:	Ubuntu Disco Dingo (development branch)
  Release:	19.04
  ---------------------------------------------------------
  seahorse:
    Installed: 3.32-1
    Candidate: 3.32-1
    Version table:
   *** 3.32-1 500
          500 http://br.archive.ubuntu.com/ubuntu disco/main amd64 Packages
          100 /var/lib/dpkg/status
  ---------------------------------------------------------

  I have absolutely no idea why or how. Just collected this report from
  apport-cli.

  Some times receiving "internal error" reports, no details provided,
  just "Cancel" or "Send report" options. So, I decided to check apport
  and there was this report.

  ProblemType: Crash
  DistroRelease: Ubuntu 19.04
  Package: seahorse 3.32-1
  ProcVersionSignature: Ubuntu 5.0.0-7.8-generic 5.0.0
  Uname: Linux 5.0.0-7-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.10-0ubuntu23
  Architecture: amd64
  AssertionMessage: seahorse: glib-watch.c:195: timeout_update: Assertion `!t->dead' failed.
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Mar 17 18:09:01 2019
  ExecutablePath: /usr/bin/seahorse
  InstallationDate: Installed on 2019-03-17 (0 days ago)
  InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Alpha amd64 (20190316)
  ProcCmdline: /usr/bin/seahorse --gapplication-service
  Signal: 6
  SourcePackage: seahorse
  StacktraceTop:
   __assert_fail_base (fmt=0x7f733ae49588 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=0x7f733aecf02d "!t->dead", file=0x7f733aecf000 "glib-watch.c", line=195, function=<optimized out>) at assert.c:92
   __GI___assert_fail (assertion=0x7f733aecf02d "!t->dead", file=0x7f733aecf000 "glib-watch.c", line=195, function=0x7f733aecf1d8 "timeout_update") at assert.c:101
   ?? () from /lib/x86_64-linux-gnu/libavahi-glib.so.1
   ?? () from /lib/x86_64-linux-gnu/libavahi-client.so.3
   ?? () from /lib/x86_64-linux-gnu/libavahi-glib.so.1
  Title: seahorse assert failure: seahorse: glib-watch.c:195: timeout_update: Assertion `!t->dead' failed.
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  separator:

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