https://bugs.kde.org/show_bug.cgi?id=462776
Bug ID: 462776
Summary: [REGRESSION] X11 file descriptors leak upon showing a
notification until maximum reached
Classification: Plasma
Product: plasmashell
Version: 5.26.3
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Notifications
Assignee: plasma-b...@kde.org
Reporter: hi-an...@yandex.ru
CC: k...@privat.broulik.de
Target Milestone: 1.0
SUMMARY
This bug appeared after some update. Basically, Xorg have a bunch of these
"/memfd:xshmfence (deleted)" fds, and their number keeps increasing over time,
until no more graphical apps are able to start (there's a limit of 1024 file
descriptors per process AFAIK). Restarting `plasmashell` resets their number.
I've also seen other glitches, such as plasmashell hanging completely, or picom
suddenly not showing a surface — but now that I found the problem with FDs, I
suspect that may cause other ones as well.
It's hard to pinpoint the version where it's appeared, mainly because I only
yesterday figured out the problem with descriptors, and then upgraded. I know
for sure the problem is present since 5.26.3, so I set this version for now.
STEPS TO REPRODUCE
1. Log into a Xorg plasma session
2. Execute `sudo ls /proc/$(pgrep Xorg)/fd | wc -l`
3. Execute `notify-send hello` and wait for notification to disappear
4. Execute `sudo ls /proc/$(pgrep Xorg)/fd | wc -l`
OBSERVED RESULT
The number in step 4 is larger than one in step 2
EXPECTED RESULT
The numbers in step 4 and 2 are the same
WORKAROUND:
Restarting plasmashell resets the number of FDs back:
killall plasmashell && kstart5 plasmashell &>/dev/null &
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Archlinux
KDE Plasma Version: 5.26.4
KDE Frameworks Version: 5.100.0
Qt Version: 5.15.7
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