https://bugs.kde.org/show_bug.cgi?id=470898
Bug ID: 470898
Summary: resource leak: the number of threads increases over
time, boundlessly
Classification: Plasma
Product: kwin
Version: 5.27.5
Platform: Debian stable
URL: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1037
268
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: platform-x11-standalone
Assignee: kwin-bugs-n...@kde.org
Reporter: j...@jmuchemb.eu
Target Milestone: ---
SUMMARY
After 17 days, the number of threads of /usr/bin/kwin_x11 process has exceeded
2700 and it keeps increasing. At the beginning of a session, the process starts
with 34 threads.
I could find that such leak happens when viewing videos fullscreen e.g. with
mpv. More precisely, when exiting fullscreen.
I found the issue because I configure a nproc limit to protect against
fork-bombs.
STEPS TO REPRODUCE
1. start mpv without --fs -> thread count does not change
2. switch to fullscreen -> usually -2 threads
3. leaves fullscreen -> usually +17 threads
4. exit mpv -> thread count does not change
ADDITIONAL INFORMATION
- Version 4:5.27.2 was affected too. I previously used 4:5.24.4 and I'm almost
sure it had no leak or it was not as severe.
- I do have a 4k intel display.
- I was unable to reproduce the issue inside qemu (didn't try 4k though, only
FHD).
- I found that the number of threads (initially & how fast it increases)
depends on the number of CPU. I have a i7-1260P (16 entries in /proc/cpuinfo).
- kwin_wayland is not affected. And wayland also fixes display corruption I had
with X11 (regularly, for less than 1s).
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