Bug 506197

Summary:	Memory leak only on Wayland
Product:	[Plasma] plasmashell	Reporter:	Jaime Antonio Gonzalez <enigma1052666>
Component:	generic-performance	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED DUPLICATE
Severity:	normal	CC:	nate
Priority:	NOR	Keywords:	wayland-only
Version First Reported In:	master
Target Milestone:	1.0
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:
Attachments:	unresolved functions tree

Description Jaime Antonio Gonzalez 2025-06-26 06:01:58 UTC

Created attachment 182678 [details]
unresolved functions tree

SUMMARY

Plasmashell RAM usage keeps growing over time,  even when idling.

Doesn't happen on X11 session.


STEPS TO REPRODUCE
1. Use Wayland session
2. Leave the system running for 30 mins - 1 hour

OBSERVED RESULT

Memory usage grows exponentially over time.

EXPECTED RESULT

I shouldn't grow that much

SOFTWARE/OS VERSIONS

Operating System: EndeavourOS 
KDE Plasma Version: 6.4.1
KDE Frameworks Version: 6.15.0
Qt Version: 6.9.1
Kernel Version: 6.15.3-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 4 × Intel® Core™ i5-2400 CPU @ 3.10GHz
Memory: 8 GiB of RAM (7.7 GiB usable)
Graphics Processor 1: NVIDIA GeForce GTX 1060 3GB/PCIe/SSE2
Graphics Processor 2: NVIDIA GeForce GTX 1060 3GB/PCIe/SSE2


ADDITIONAL INFORMATION

Note: even though I have Intel HD2000 IGP as Device 1 and GTX 1060 as Device 2 (checked with inxi -G) both devices appear as GTX 1060.

Using heaptrack to trace the leak, it points to "unresolved functions" in libnvidia-eglcore.so, libnvidia-egl-wayland.so, libEGL-nvidia.so, going deeper into the tree it continues with unresolved functions in libQt6Gui.so and libQt6Quick.so

I will link the heaptrack zst file (it's big, around 30 MiB) so someone with better knowledge can inspect it and maybe can come up with a fix.

Heaptrack file: https://www.mediafire.com/file/1vatpv9omuss6ha/heaptrack.plasmashell.9283.zst/file

Comment 1 Nate Graham 2025-06-26 16:30:33 UTC

Do you use a slideshow wallpaper? If so, this is Bug 480693, which was traced to an issue in the NVIDIA driver.

Frankly, the issue you're seeing is almost certainly also an issue in the NVIDIA driver even if it's not that exact issue. Thanks for the debugging you've done to make that clear! It's very helpful.

Comment 2 Jaime Antonio Gonzalez 2025-07-03 06:11:16 UTC

(In reply to Nate Graham from comment #1)
> Do you use a slideshow wallpaper? If so, this is Bug 480693, which was
> traced to an issue in the NVIDIA driver.
> 
> Frankly, the issue you're seeing is almost certainly also an issue in the
> NVIDIA driver even if it's not that exact issue. Thanks for the debugging
> you've done to make that clear! It's very helpful.

Yes, I'm using the slideshow wallpaper.

I just tried with a static image and it leaks but not that crazy (around 160 MiB)

I tried slideshow only on monitor 2 (driven by the HD2000 IGP) it leaks a bit higher than no slideshow (around 175 MiB)

I tried slideshow only on monitor 1 (driven by the GTX1060) it leaks almost the same as slideshow only on monitor 2

But using slideshow on the 2 monitors, makes it leak big again. I have set the timer to switch images to 1 min.

Strangely, after killing and restarting plasmashell 3 or 4 times, it behaves correctly.

Comment 3 Nate Graham 2025-07-03 11:53:41 UTC

Thanks, it's Bug 480693 then. Any remaining leaks when *not* using a slideshow wallpaper are very likely to also be NVIDIA driver issues too.

*** This bug has been marked as a duplicate of bug 480693 ***