https://bugs.kde.org/show_bug.cgi?id=462277
Bug ID: 462277
Summary: When a window is closed, kwin does not free the memory
for its icon
Classification: Plasma
Product: kwin
Version: 5.25.3
Platform: Archlinux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: kishor...@gmail.com
Target Milestone: ---
Created attachment 154051
--> https://bugs.kde.org/attachment.cgi?id=154051&action=edit
kwin support information
SUMMARY
When a window is opened, kwin seems to allocate some memory to store its icon.
However, this memory is not freed when the window is closed.
heaptrack output:
https://drive.google.com/file/d/1xkhCrdzyPWCX6wtRDGubhhkyOfE-jeaN/view?usp=sharing
(it is too big to attach here, 5 MB)
STEPS TO REPRODUCE
1. `heaptrack kwin_x11 --replace`
2. Run the following loop in bash:
```
while true
do
sleep 5
dolphin &
sleep 5
killall dolphin -u kishore
done
```
3. Wait for some time
4. Kill kwin.
5. `heaptrack_gui $name_of_output_file`
OBSERVED RESULT
Kwin's memory usage grows linearly with time (heaptrack output attached). The
backtrace to which heaptrack associates most of the memory is:
```
readIcon in libKF5WindowSystem.so.5
NETWinInfo::update(QFlags<NET::Property>, QFlags<NET::Property2>) in
libKF5WindowSystem.so.5
KWin::WinInfo::WinInfo(KWin::X11Window*, unsigned int, unsigned int,
QFlags<NET::Property>, QFlags<NET::Property2>) in libkwin.so.5
KWin::X11Window::manage(unsigned int, bool) in libkwin.so.5
KWin::Workspace::createX11Window(unsigned int, bool) in libkwin.so.5
KWin::Workspace::workspaceEvent(xcb_generic_event_t*) in libkwin.so.5
QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) in
libQt5Core.so.5
QXcbConnection::handleXcbEvent(xcb_generic_event_t*) in libQt5XcbQpa.so.5
QXcbConnection::processXcbEvents(QFlags<QEventLoop::ProcessEventsFlag>) in
libQt5XcbQpa.so.5
<unresolved function> in libQt5XcbQpa.so.5
g_main_context_dispatch in libglib-2.0.so.0
<unresolved function> in libglib-2.0.so.0
g_main_context_iteration in libglib-2.0.so.0
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) in
libQt5Core.so.5
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) in libQt5Core.so.5
QCoreApplication::exec() in libQt5Core.so.5
main in kwin_x11
```
EXPECTED RESULT
Memory usage should reach steady state after some time.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.26.3
KDE Frameworks Version: 5.100.0
Qt Version: 5.15.7
Kernel Version: 5.15.79-1-lts (64-bit)
Graphics Platform: X11
Graphics Processor: virgl
Manufacturer: QEMU
ADDITIONAL INFORMATION
A. I'm not sure if the same thing happens on Wayland.
B. I installed debug symbols for kwin and kwindowsystem.
C. kwin support information (`qdbus org.kde.KWin /KWin supportInformation`) is
attached
D. heaptrack output:
https://drive.google.com/file/d/1xkhCrdzyPWCX6wtRDGubhhkyOfE-jeaN/view?usp=sharing
(it is too big to attach here, 5 MB)
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