Bug 487289

Summary:	plasmashell on Wayland crashes when more than ~100 windows are open
Product:	[Plasma] plasmashell	Reporter:	Jacob Kauffmann <jacob>
Component:	generic-crash	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED DUPLICATE
Severity:	crash	CC:	nate
Priority:	NOR
Version First Reported In:	6.0.4
Target Milestone:	1.0
Platform:	Neon
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Jacob Kauffmann 2024-05-20 16:59:46 UTC

SUMMARY
When running on Wayland, plasmashell has a maximum number of windows that it can handle-- around 100. When more than this number is opened, plasmashell crashes. It can be restarted once the number of windows goes back down, but not while the number remains the same. (See the attached video.)

STEPS TO REPRODUCE
1. Start a KDE Wayland session
2. Open 100 windows, then a few more

OBSERVED RESULT
plasmashell crashes.

EXPECTED RESULT
plasmashell continues to run.

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

ADDITIONAL INFORMATION
This is happening on KDE Neon and Arch Linux (both currently with 6.0.4).

The specific application does not matter. I recreated this in Neon with both Firefox and Kate, and most of my windows on Arch are typically Brave.

The hardware also does not matter. I recreated this in Neon on VirtualBox, and in Arch on physical hardware (AMD CPU + NVIDIA GPU).

When I'm teetering on the edge of the maximum window limit, opening the Notifications applet in the bottom panel is also able to count as a "window" and cause plasmashell to crash.

Comment 1 Jacob Kauffmann 2024-05-20 17:09:25 UTC

The video (~1 minute) is too large to attach. Here's a link instead: https://www.dropbox.com/scl/fi/ybenhbnf563428nr165gm/kde-plasma-100-windows.webm?rlkey=9hbuk02e2v89s0cvm5dbcex60&e=1&st=rtyscexo&dl=0

Comment 2 Jacob Kauffmann 2024-05-23 20:59:38 UTC

I can't seem to get gdb to give me any significant output for either plasmashell or kwin_wayland when this occurs (just threads exiting/starting, and output that shows up normally before the issue happens). Give that plasmashell's only output when the issue occurs is "The Wayland connection broke. Did the Wayland compositor die?", and that message doesn't come from plasmashell or kwin's codebase (I think it comes from Qt?), I'm not sure where to even start when it comes to debugging this.

Comment 3 Nate Graham 2024-05-24 00:42:36 UTC


*** This bug has been marked as a duplicate of bug 479492 ***