https://bugs.kde.org/show_bug.cgi?id=524042
Bug ID: 524042
Summary: kontact uses all my gpu memory
Classification: Applications
Product: kontact
Version First 6.7.3
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
DESCRIPTION
Kontact was left running by itself and used all my GPU memory:
```
+-----------------------------------------------------------------------------------------+
| NVIDIA-SMI 610.57.04 KMD Version: 610.57.04 CUDA UMD
Version: 13.3 |
+-----------------------------------------+------------------------+----------------------+
| GPU Name Persistence-M | Bus-Id Disp.A | Volatile
Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap | Memory-Usage | GPU-Util
Compute M. |
| | |
MIG M. |
|=========================================+========================+======================|
| 0 NVIDIA GeForce RTX 3070 Off | 00000000:01:00.0 Off |
N/A |
| 0% 32C P8 11W / 220W | 7788MiB / 8192MiB | 3%
Default |
| | |
N/A |
+-----------------------------------------+------------------------+----------------------+
+-----------------------------------------------------------------------------------------+
| Processes:
|
| GPU GI CI PID Type Process name
GPU Memory |
| ID ID
Usage |
|=========================================================================================|
| 0 N/A N/A 447637 C+G /usr/bin/kontact
7776MiB |
+-----------------------------------------------------------------------------------------+
```
The leak is in the main `kontact` process itself, not in the QtWebEngine
renderer
subprocesses — those stay at ~20 MB RSS each. The main process had also grown
to
7.4 GB RSS after ~6 days of uptime:
```
$ grep VmRSS /proc/447637/status
VmRSS: 7448104 kB
$ ps -o pid,etime,cmd -C kontact
PID ELAPSED CMD
447637 06:33:05 /usr/bin/kontact
$ ps --ppid 447637 -o pid,rss,cmd
PID RSS CMD
447674 20128 /usr/lib/qt6/QtWebEngineProcess --type=zygote --no-zygote-sandbox
...
447675 20396 /usr/lib/qt6/QtWebEngineProcess --type=zygote ...
```
The RSS and the GPU allocation track each other closely, which looks like GPU
buffers being allocated and never released rather than one large allocation.
This is a hybrid-graphics machine: Plasma itself runs on the Intel UHD 770
iGPU,
but the kontact process has the NVIDIA EGL/GLX stack mapped in and is holding
memory on the discrete GPU:
```
$ grep -oE '/[^ ]*(nvidia|libGL|EGL)[^ ]*' /proc/447637/maps | sort -u
/dev/nvidia0
/dev/nvidiactl
/usr/lib/libEGL_mesa.so.0.0.0
/usr/lib/libEGL_nvidia.so.610.57.04
/usr/lib/libGLX_nvidia.so.610.57.04
/usr/lib/libnvidia-eglcore.so.610.57.04
/usr/lib/libnvidia-egl-gbm.so.1.1.3
/usr/lib/libnvidia-egl-wayland.so.1.1.21
/usr/lib/libnvidia-glcore.so.610.57.04
...
```
STEPS TO REPRODUCE
1. Start Kontact on a Wayland session with an NVIDIA GPU present (here: Intel
iGPU
drives the desktop, NVIDIA RTX 3070 as secondary GPU, nvidia-open-dkms
610.57.04).
2. Leave it running and idle for several days without restarting it.
3. Watch `nvidia-smi` and the process RSS over time.
OBSERVED RESULT
After ~6 days of idle uptime, the kontact process is holding 7776 MiB of the
GPU's 8192 MiB of VRAM and 7.4 GB of system RAM. The GPU is effectively full,
so other GPU workloads fail to allocate. GPU utilisation is only 3-5% and the
card is in P8, so nothing is actively rendering — the memory is just never
freed. Restarting Kontact releases all of it.
The HTML Message view area is not working, and has not been working for a
while, and I can't view email in their own window either.
EXPECTED RESULT
It's not even supposed to use the Nvidia GPU, the Intel GPU drives the desktop
and everything else, including the browser I'm typing this in. Nothing is
plugged into the Nvidia GPU and I'm only using it for acceleration (apparently
accelerating my email now)
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.7.4
KDE Frameworks Version: 6.28.0
Qt Version: 6.11.1
ADDITIONAL INFORMATION
kontact 26.04.3-1 (Arch)
qt6-webengine 6.11.1-5
Kernel: 7.1.5-arch1-2 (64-bit)
Graphics Platform: Wayland
CPU: 12th Gen Intel Core i7-12700 (20 threads)
RAM: 64 GiB
Primary GPU: Mesa Intel UHD Graphics 770
Secondary GPU: NVIDIA GeForce RTX 3070, nvidia-open-dkms / nvidia-utils
610.57.04
Relevant environment on the affected process (not sure if it matters):
QT_WAYLAND_RECONNECT=1
QT_DEBUG_PLUGINS=1
I have not isolated which component is responsible. If it would help I can
run Kontact with only specific plugins enabled (KMail, KOrganizer, Akregator,
etc.) to narrow it down, or something else.
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