Bug 483722

Summary: kscreenlocker_greet locks up since Plasma 6 upgrade
Product: [Plasma] kscreenlocker Reporter: Thilo-Alexander Ginkel <thilo>
Component: generalAssignee: Plasma Bugs List <plasma-bugs>
Status: RESOLVED DUPLICATE    
Severity: normal CC: amantia, kdedev, ppwwyyxxc, vrodic
Priority: NOR Keywords: qt6
Version: 6.1.4   
Target Milestone: ---   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:
Attachments: backtrace for all threads
backtrace for all threads with complete debug symbols

Description Thilo-Alexander Ginkel 2024-03-16 06:48:47 UTC
Created attachment 167293 [details]
backtrace for all threads

SUMMARY

Hi there,

since upgrading to KDE / Plasma 6 kscreenlocker_greet sporadically locks up right after activating the lock screen: The mouse pointer disappears, the clock does not advance and the process can only be killed with SIGKILL.

I am using a ThinkPad P1 Gen 5 (w/ Intel GPU) with an external display attached via a Dock and DisplayPort. The session is based on Wayland.

I hope the attached backtrace is somewhat useful. If not, please let me know and I'll try to get a better one.

STEPS TO REPRODUCE
1. Lock the screen
2. Play the deadlock lottery
3. If you're lucky, the lockscreen freezes

OBSERVED RESULT

The lock screen freezes. The session can not be unlocked.

EXPECTED RESULT

The lock screen does not freeze. The session can be unlocked.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 6.0.2
KDE Frameworks Version: 6.0.2
Qt Version: 6.6.2

ADDITIONAL INFORMATION
Comment 1 Thilo-Alexander Ginkel 2024-03-19 13:08:53 UTC
Created attachment 167471 [details]
backtrace for all threads with complete debug symbols

The lockup just happened again and I have been able to capture a backtrace with complete debug symbols courtesy of debuginfod.
Comment 2 András Manţia 2024-03-29 16:13:23 UTC
This seems to happen if you move the mouse to cancel the lock when it was not fully locked.
Comment 3 András Manţia 2024-03-29 16:14:04 UTC
I experience this on X11 though.
Comment 4 Vedran Rodic 2024-08-17 07:39:56 UTC
I experience the same issue.

Latest Arch Linux on Xorg, single monitor, open source Radeon drivers. 

Linux 6.10.4
kscreenlocker 6.1.4
xorg-server 21.1.13
xf86-video-amdgpu 23.0.0
sddm 0.21.0
Comment 5 Vedran Rodic 2024-08-17 07:46:24 UTC

*** This bug has been marked as a duplicate of bug 483094 ***