https://bugs.kde.org/show_bug.cgi?id=406303
Bug ID: 406303
Summary: Task Manager eats up open file descriptors on X server
until maximum reached
Product: plasmashell
Version: 5.14.5
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Task Manager
Assignee: h...@kde.org
Reporter: nik...@gmail.com
CC: plasma-b...@kde.org
Target Milestone: 1.0
Created attachment 119283
--> https://bugs.kde.org/attachment.cgi?id=119283&action=edit
dmesg-5.0.5-200.fc29.x86_64
SUMMARY
After longish use of KDE Plasma session, Xorg server runs out of file handles
(a count of 1024 by default). I.e. /proc/`pidof Xorg`/fd fills up an anonymous
file entries like:
...
lrwx------. 1 root root 64 Apr 6 10:55 95 -> '/memfd:xshmfence (deleted)'
lrwx------. 1 root root 64 Apr 6 13:18 96 -> '/memfd:xshmfence (deleted)'
lrwx------. 1 root root 64 Apr 6 10:55 97 -> '/memfd:xshmfence (deleted)'
lrwx------. 1 root root 64 Apr 6 10:55 98 -> '/memfd:xshmfence (deleted)'
lrwx------. 1 root root 64 Apr 6 10:55 99 -> '/memfd:xshmfence (deleted)'
...
STEPS TO REPRODUCE
1. login to Plasma session
2. open dozens of applications so that Task Manager starts grouping task
instances
3. observe content of /proc/`pidof Xorg`/fd by commands ls and wc
4. induce creation of memfd:xshmfence fds by hovering on panel (Task Manager),
over group of open tasks so that Task Manager shows thumbnails of windows of
open applications. This step will increase leaked fds by number of window
thumbnails of hovered group
5. move mouse pointer so that group popup disappears
6. repeat from 3. until system file limit is hit
OBSERVED RESULT
When Xorg has run out of system file limit, random problems start to appear:
- key bindings may lost and/or have no desired effect
- mouse clicks / drags have no effect
- $HOME/.cache corrupts somehow
- system requires reboot and possibly restore of
$HOME/(.cache|.config|.kde|.local) from backup
EXPECTED RESULT
Task Manager / Plasmashell shall release rendering related memory gracefully
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 29, kernel 5.0.5 / Plasma5
(available in About System)
KDE Plasma Version: 5.14.5
KDE Frameworks Version: 5.55.0
Qt Version: 5.11.3
ADDITIONAL INFORMATION
Hovering on Pager or on System Tray in a such way that popup window appears
does not consume an anonymous file handles on X server permanently. Only via
Task Manager does.
Also, if running application is minimized so that only enlarged app icon is
shown on group popup (instead of window thumbnail), Task Manager does not leak
memfd handles
I created a bug on RHBZ already:
https://bugzilla.redhat.com/show_bug.cgi?id=1696961
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