SIGSEV when turning on display while screensaver is active (gnome-screensaver-dialog crash)

[Tobias Knöppler]

Since the update to Ubuntu 18.04 (ubuntu budgie) the screensaver stopped working.

Description of the error:

When I lock the screen, the display turns black (as intended). However, when I press a key or move the mouse to turn the display again, no login-dialog is shown - instead I see the lockscreen wallpaper and the mouse cursor shows graphical glitches (becoming invisible and visible when moving it).
I can unlock again by typing `gnome-screensaver-command -d` into a tty.

I have found out, that the program 'gnome-screensaver-dialog' crashes with a SIGSEV and causes the described failure. Purging and reinstalling the package 'gnome-screensaver' did not help. Running 'gnome-screensaver-dialog' with gdb generates the attached output (which is hopefully useful for tracking down the problem).

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gnome-screensaver 3.6.1-8ubuntu3
ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
Uname: Linux 4.15.0-23-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CurrentDesktop: Budgie:GNOME
Date: Fri Jun 22 00:15:10 2018
EcryptfsInUse: Yes
InstallationDate: Installed on 2018-02-14 (127 days ago)
InstallationMedia: Ubuntu-Budgie 17.10 "Artful Aardvark" - Release amd64 (20180106)
SourcePackage: gnome-screensaver
UpgradeStatus: Upgraded to bionic on 2018-04-29 (53 days ago)

[fossfreedom (fossfreedom)]

Please install the debug symbols as described here and follow the instructions also to produce a backtrace.

Thanks

https://wiki.ubuntu.com/DebuggingProgramCrash

[Tobias Knöppler (thecalcaholic)]

Thank you for the response. With debug symbols installed, gdb produces the attached output.

[Tobias Knöppler (thecalcaholic)]

Do you need any more information?