/usr/lib/snapd-glib/snapd-login-service:11:read_data:read_from_snapd:read_cb:socket_source_dispatch:g_main_dispatch

This can be reproduced by:
1. Attempting a login, e.g. using Python:
$ python
>>> from gi.repository import Snapd
>>> Snapd.login_sync ("", "", "")
2. Entering your password in the PolicyKit dialog
3. Killing snapd, i.e:
$ sudo killall snapd

Step 1 causes snapd-login-service to start, 2 to make a connection to snapd and 3 to cause the socket to be closed. Because snapd-glib wasn't correctly disabling the socket callback it would be called on a destroyed object.

This is a relatively low risk bug, since snapd-login-service crashing will just cause it to be restarted on the next call.

This bug was fixed in the package snapd-glib - 1.4-0ubuntu1

---------------
snapd-glib (1.4-0ubuntu1) zesty; urgency=medium

  * New upstream release:
    - Fix crash in snapd-login-service when snapd stops (LP: #1646784)

 -- Robert Ancell <email address hidden> Tue, 06 Dec 2016 15:50:17 +1300

Thanks for uploading the fix for this bug report to -proposed. However, when reviewing the package in -proposed and the details of this bug report I noticed that the bug description is missing information required for the SRU process. You can find full details at http://wiki.ubuntu.com/StableReleaseUpdates#Procedure but essentially this bug is missing some of the following: a statement of impact, a test case and details regarding the regression potential. Thanks in advance!

An upload of snapd-glib to xenial-proposed has been rejected from the upload queue for the following reason: "Please provide SRU information in the relevant bug, and particualrly mention that this is updating to 1.4 rather than just fixing a particular bug. It might be worth getting the TB to look at a special SRU process for snapd-glib alongside the existing snapd and snapcraft processes.".

Hello errors.ubuntu.com, or anyone else affected,

Accepted snapd-glib into xenial-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/snapd-glib/1.13-0ubuntu0.16.04.1 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 and change the tag from verification-needed-xenial to verification-done-xenial. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-xenial. In either case, details of your testing will help us make a better decision.

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

errors.ubuntu.com is not showing any occurrences of this in Xenial.

This bug was fixed in the package snapd-glib - 1.13-0ubuntu0.16.04.1

---------------
snapd-glib (1.13-0ubuntu0.16.04.1) xenial; urgency=medium

  * New upstream release: (LP: #1699005)
    - New API:
      - snapd_alias_get_app
      - snapd_alias_get_name
      - snapd_alias_get_snap
      - snapd_alias_get_status
      - snapd_alias_get_type
      - snapd_alias_status_get_type
      - snapd_app_get_aliases
      - snapd_app_get_daemon_type
      - snapd_assertion_get_body
      - snapd_assertion_get_header
      - snapd_assertion_get_headers
      - snapd_assertion_get_signature
      - snapd_assertion_get_type
      - snapd_assertion_new
      - snapd_change_get_id
      - snapd_change_get_kind
      - snapd_change_get_ready
      - snapd_change_get_ready_time
      - snapd_change_get_spawn_time
      - snapd_change_get_status
      - snapd_change_get_summary
      - snapd_change_get_tasks
      - snapd_change_get_type
      - snapd_client_add_assertions_async
      - snapd_client_add_assertions_finish
      - snapd_client_add_assertions_sync
      - snapd_client_check_buy_async
      - snapd_client_check_buy_finish
      - snapd_client_check_buy_sync
      - snapd_client_connect_async
      - snapd_client_connect_finish
      - snapd_client_create_user_async
      - snapd_client_create_user_finish
      - snapd_client_create_user_sync
      - snapd_client_create_users_async
      - snapd_client_create_users_finish
      - snapd_client_create_users_sync
      - snapd_client_disable_aliases_async
      - snapd_client_disable_aliases_finish
      - snapd_client_disable_aliases_sync
      - snapd_client_enable_aliases_async
      - snapd_client_enable_aliases_finish
      - snapd_client_enable_aliases_sync
      - snapd_client_find_refreshable_async
      - snapd_client_find_refreshable_finish
      - snapd_client_find_refreshable_sync
      - snapd_client_find_section_async
      - snapd_client_find_section_finish
      - snapd_client_find_section_sync
      - snapd_client_get_aliases_async
      - snapd_client_get_aliases_finish
      - snapd_client_get_aliases_sync
      - snapd_client_get_assertions_async
      - snapd_client_get_assertions_finish
      - snapd_client_get_assertions_sync
      - snapd_client_get_sections_async
      - snapd_client_get_sections_finish
      - snapd_client_get_sections_sync
      - snapd_client_install2_async
      - snapd_client_install2_finish
      - snapd_client_install2_sync
      - snapd_client_install_stream_async
      - snapd_client_install_stream_finish
      - snapd_client_install_stream_sync
      - snapd_client_new_from_socket
      - snapd_client_refresh_all_async
      - snapd_client_refresh_all_finish
      - snapd_client_refresh_all_sync
      - snapd_client_reset_aliases_async
      - snapd_client_reset_aliases_finish
      - snapd_client_reset_aliases_sync
      - snapd_client_run_snapctl_async
      - snapd_client_run_snapctl_finish
      - snapd_client_run_snapctl_sync
      - snapd_client_try_async
      - snapd_client_try_finish
      - snapd_client_try_sync
      - snapd_create_user_flags_get_type
      - snapd_daemon_type_get_type
      - snapd_install_flags_get_type
      - snapd_...

The verification of the Stable Release Update for snapd-glib has completed successfully and the package has now been released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.