lightdm-gtk-greeter-team team mailing list archive

[xtaz <1890394@xxxxxxxxxxxxxxxxxx>]

I upgraded my laptop from 20.04.1 to 20.10 using do-release-upgrade and
found that icons were missing in lightdm-gtk-greeter. Logs suggested
that icon files and background wallpaper could not load due to out of
memory errors.

I performed a clean install of 20.10 and the icons were then working but
I was faced with a black screen 50% of the time. Logs also showed out of
memory errors loading fonts etc. systemd was constantly trying to
restart lightdm and failing causing a flickering screen.

I added the proposed channel and installed the lightdm-gtk-
greeter_2.0.6-0ubuntu2_amd64.deb package from there. Subsequent reboots
of my laptop have all worked as expected without any problems.

Thank you for this updated package. It does appear to fix the problem.

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greeter in Ubuntu.
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 Committed

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

  OpenGL ES 3.2
  Mesa 20.2.0-devel

  [lightdm.log](https://termbin.com/eipz)
  [coredumpctl](https://termbin.com/chr2)
  [gdb_backtrace](https://termbin.com/645a)

  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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