gdm3 sometimes crash after logout and login again

[yusuf75]

gdm3 sometimes crash after logout and login again.
I get a purple screen, a mouse cursor and nothing more.
After crash, the second login always works.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gdm3 3.28.0-0ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu May 10 18:19:23 2018
InstallationDate: Installed on 2018-05-05 (5 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180425.1)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: gdm3
UpgradeStatus: No upgrade log present (probably fresh install)

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. However, your bug report is missing crash details. In order to debug a crash we will need a crash report. To create one, please follow these steps:

1. If you are not running a future development release of Ubuntu then apply the workaround from bug 994921.
2. If you are running the Ubuntu Stable Release you might need to enable apport in /etc/default/apport.
3. If the crash is in Xorg then uncomment this option from /etc/gdm3/custom.conf:
   # Additionally lets the X server dump core if it crashes
   #Enable=true
4. Reboot.
5. Reproduce the crash.
6. Look in /var/crash for crash files and when found, run:
   ubuntu-bug /var/crash/YOURFILE.crash
7. Add a comment here telling us the ID of the new bug that was created in step 6.

Please take care to avoid attaching .crash files to bugs as we are unable to process them as file attachments, and doing so is also a security risk for yourself.

[yusuf75 (yusuf-uzunyilmaz-googlemail)]

apport ist enabled and I uncommented in /etc/gdm3/custom :

#Additionally lets the X server dump core if it crashes
Enable=true

After reboot i reproduced the crash. I login and logout. Then I login with another user and logout.
After then i get a purple screen, when i try to login . But in /var/crash are no files from today.

[Daniel van Vugt (vanvugt)]

No problem. A purple screen and mouse cursor is probably bug 1766137. Let's deal with this there.

[Daniel van Vugt (vanvugt)]

... which means this possibly wasn't a crash at all :)