Created attachment 145024 [details]
logs.txt

Application: plasmashell (5.18.6)

Qt Version: 5.12.7
Frameworks Version: 5.76.0
Operating System: Linux 5.3.18-59.37-default x86_64
Windowing system: X11
Distribution: openSUSE Leap 15.3

-- Information about the crash:
- What I was doing when the application crashed:
I just login in SDDM (automatic login without passwod), for some seconds I see splash screen with more than half percentage of progress bar passed, finally either black screen appears (most often) or sometimes I press Ctrl+Alt+Backspace to restart sessions and after that I can load full Plasma desktop.

- Unusual behavior I noticed:
No Kwin window decorations. Even if I see black screen, most often I can press Alt+F2, and in this way open program (e.g. konsole).
I use X (xcb), not Wayland.
In logs I can see:
kglobalaccel5[1489]: qt.qpa.xcb: could not connect to display :0

I also see:
systemd[1]: No hostname configured.
systemd[1]: Set hostname to <localhost>.
NetworkManager[969]: <info>  [1641065313.0076] policy: set-hostname: set hostname to 'localhost.localdomain' (Error reverse-resolving “10.0.2.15”: Name or service not known)
systemd-hostnamed[981]: Changed hostname to 'localhost.localdomain'

I doubt where host name change helps...
This is LiveDVD system.

The crash can be reproduced sometimes.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
[KCrash Handler]
#4  ScreenPool::ScreenPool (this=0x563d4c2c24f0, config=..., parent=<optimized out>) at /usr/src/debug/plasma5-workspace-5.18.6-bp153.4.2.3.x86_64/shell/screenpool.cpp:48
#5  0x0000563d4a559f61 in ShellCorona::ShellCorona (this=0x563d4c2b2000, parent=<optimized out>) at /usr/src/debug/plasma5-workspace-5.18.6-bp153.4.2.3.x86_64/shell/shellcorona.cpp:105
#6  0x0000563d4a52f59b in main (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/plasma5-workspace-5.18.6-bp153.4.2.3.x86_64/shell/main.cpp:150
[Inferior 1 (process 1776) detached]

Possible duplicates by query: bug 447781, bug 447773, bug 447752, bug 447751, bug 447749.