SUMMARY If I want to reorder my running apps on the panel, immediately after I release the first app, the session closes and the login screen shows up. STEPS TO REPRODUCE 1. Open two or more apps 2. Clic on one app on the panel and drag it in another position 3. Release the mouse button and the session crashes OBSERVED RESULT The current session is closed and the login screen shows up. EXPECTED RESULT The apps on the panel should simply be reordered. SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: KDE Neon 20.04 (available in About System) KDE Plasma Version: 5.20.3 KDE Frameworks Version: 5.75.0 Qt Version: 5.15.1 ADDITIONAL INFORMATION I'm running a Wayland session.
Are these pinned task manager icons or icon applets which held app launchers? Also please attach a backtrace of the crash so we can figure out what's happening. See https://community.kde.org/Get_Involved/Issue_Reporting#Crash_reports_must_include_backtraces.
@Nate Graham Are these pinned task manager icons or icon applets which held app launchers? ==> let say I open two apps: Dolphin and KSysGuard. In the panel I see the two apps (rectangular icon with the name of the app), and are those that I can reorder with a drag & drop. I'm not sure if they are pinned icons or icon applets. Also please attach a backtrace of the crash ==> well, I'm afraid it's a bit too much "technical" for me, sorry. Moreover the problem is that I don't know what to trace. The entire session ends suddenly, but I don't know if the crash happens in the "Wayland Session" as a whole, or in the panel. DrKonqi doesn't show up.
Ah, so pinned apps. Thanks. Cannot reproduce.
I have recorded a brief video of the screen of my PC with my mobile phone when the issue happens. You can watch the video at the following link (the file is too big to upload it as attachment). https://www.mycloud.ch/l/L005D87F1F9960921DE74DB4FE0B00BD09430A8F31507A77A3530AB97D830C15 I can also add that this same issue happens on another PC, so it's not linked to this PC only.
Thanks for the video, that's helpful. Looks like you're using a Task Manager (not icons-only). Works for me FWIW. Can you attach a backtrace of the crash? `coredumpctl` can retrieve it.
Created attachment 133405 [details] coredumpctl
I have installed "systemd-coredumpctl" and reproduced the issue. Then I have used the following command: sudo coredumpctl info 1137 > coredump_wayland.txt to save the dump of the PID 1137 (see attachment) listed as: TIME PID UID GID SIG COREFILE EXE Tue 2020-11-17 20:36:26 CET 1137 1000 1000 11 truncated /usr/bin/kwin_wayland First time I use coredumpctl. I hope this can be useful.
No worries. Here's what you do. First, dump the core to a file: coredumpctl --dump --output ~/Desktop/my_very_special_core.dump Next, load it up in gdb: gdb /usr/bin/kwin_wayland ~/Desktop/my_very_special_core.dump Then type "bt". Copy and paste the output to a file, and attach that file.
Created attachment 133444 [details] gdb dump of kwin-wayland
I have tried to run the commands you suggested (thanks!) I have uploaded the gdb output as attachment.
Aww man: > BFD: warning: /home/nicola/Scrivania/coredump_wayland_1195.dump is truncated: expected core file size >= 2883301376, found: 2147483648 > Backtrace stopped: Cannot access memory at address 0x7fff5ae6f918 I hate this. :( It's so complicated to get a backtrace out of coredumpctl. :( Thanks anyway.
I have the exact same issue. My system info: Operating System: Arch Linux KDE Plasma Version: 5.20.3 KDE Frameworks Version: 5.76.0 Qt Version: 5.15.2 Kernel Version: 5.9.9-zen1-1-zen OS Type: 64-bit Processors: 12 × AMD Ryzen 5 PRO 4650U with Radeon Graphics Memory: 14.9 GiB of RAM Graphics Processor: AMD RENOIR I also tried to retrieve a backtrace but got the same output as Nicola: > Backtrace stopped: Cannot access memory at address 0x7ffea621a6d0
This crash is also happening for me on Arch Linux. I have no pinned apps. The Plasma Wayland session crashes when trying to rearrange task manager buttons. The crash does not happen in a Plasma Xorg session. Plasma 5.20.3 Frameworks 5.76.0 Qt 5.15.2 Kernel 5.9.9-arch1-1 x86_64
Oof. Whole session crashes with a common workflow are no bueno. Raising to VHI.
No backtrace, not reproducible. Marking as needsinfo. > Raising to VHI. Lets save this for only things that are hit commonly.
There were some d&d related fixes in kwayland in master since last release, potentially those fixed it
Is there something I can try to get a valid backtrace? I'd glad to help.
Dear Bug Submitter, This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information as soon as possible and set the bug status as REPORTED. Due to regular bug tracker maintenance, if the bug is still in NEEDSINFO status with no change in 30 days the bug will be closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging If you have already provided the requested information, please mark the bug as REPORTED so that the KDE team knows that the bug is ready to be confirmed. Thank you for helping us make KDE software even better for everyone!
*** This bug has been marked as a duplicate of bug 430111 ***