lightdm-gtk-greeter-team team mailing list archive

[Georg Sauthoff <1890394@xxxxxxxxxxxxxxxxxx>]

I tested the proposed update (2.0.5-0ubuntu2) on Ubuntu bionic and I can
confirm that it fixes the issue.

That means the lightdm graphical login screen is now displayed again as
expected (and is functional, i.e. logins do work), i.e. the
lightdm.service start succeeds again.

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https://bugs.launchpad.net/bugs/1890394

Title:
  Lightdm-gtk-greeter coredump during boot with recent systemd versions

Status in lightdm-gtk-greeter package in Ubuntu:
  Fix Released
Status in lightdm-gtk-greeter source package in Bionic:
  Fix Committed
Status in lightdm-gtk-greeter source package in Groovy:
  Fix Released

Bug description:
  * Impact
  The lightdm-gtk-greeter often segfaults on VMs

  * Test case
  - start a xubuntu livesession in a VM and logout
  -> you should get a greeter to log in
  (or install xubuntu in a VM)

  * Regression potential
  the mlockall call was supposed to provide improved security but isn't working, it was already commented out some cycles ago in unity-greeter, upstream and it other distributions

  ------------------

  Upstream:https://github.com/Xubuntu/lightdm-gtk-greeter/issues/77

  This is one of the many core dumps on `journalctl` for a given boot
  (dumps multiple times before starting) :

  **See it on upstream bug report**

  System Details:

  System:
  Kernel: 5.8.0-12-generic x86_64 bits: 64 compiler: N/A Desktop:
  Xfce 4.14.2
  Distro: Ubuntu 20.10 (Groovy Gorilla) (*Proposed)

  lightdm                       1.30.0-0ubuntu3.1: amd64
  lightdm-gtk-greeter           2.0.6-0ubuntu1:amd64
  lightdm-gtk-greeter-settings  1.2.2-3
  linux-firmware                1.189
  ------------------------------------------------------
  systemd,systemd-coredump,
  systemd-sysv                                245.7-1ubuntu1
  ------------------------------------------------------

  Current Behaviour:

  On boot screen blinks for 2-3 times (probably the segmentation fault)
  but eventually starts after 1-2 minutes.

  Expected Behaviour:

  Greeter would appear properly after boot.

  Note: Some other systemd services are also failing on proposed, not
  sure if related.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.10
  Package: lightdm-gtk-greeter 2.0.6-0ubuntu1
  ProcVersionSignature: Ubuntu 5.8.0-12.13-generic 5.8.0-rc7
  Uname: Linux 5.8.0-12-generic x86_64
  ApportVersion: 2.20.11-0ubuntu43
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: XFCE
  Date: Wed Aug  5 12:58:44 2020
  InstallationDate: Installed on 2020-04-17 (109 days ago)
  InstallationMedia: Xubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200416)
  SourcePackage: lightdm-gtk-greeter
  UpgradeStatus: Upgraded to groovy on 2020-08-04 (0 days ago)

  modified.conffile..etc.lightdm.lightdm-gtk-greeter.conf:
  [greeter]
   indicators = ~session;~language;~a11y;~clock;~power
   default-user-image = /home/korte/Pictures/profile/profile.jpeg
  mtime.conffile..etc.lightdm.lightdm-gtk-greeter.conf: 2020-06-27T09:26:56.022638

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