kde systemsettings uses 100% CPU

[James Ring]

Using systemsettings 4:4.11.11-0ubuntu0.2:

When I add a new startup program to KDE, systemsettings eats 100% CPU. I can reproduce this every time with the following steps:

Go into System Settings > Startup and Shutdown > Autostart > Add program

In my case, I select /usr/bin/synergy and click OK. At this point, systemsettings process will eat 100% CPU. A strace gives the following:

write(3, "\1\0\0\0\0\0\0\0", 8) = 8

about a bajillion times. Following is a listing of the process' /proc/<pid>/fd directory:

$ ls -l /proc/6883/fd
total 0
lr-x------ 1 sjr eng 64 Dec 19 10:36 0 -> pipe:[36877]
lrwx------ 1 sjr eng 64 Dec 19 10:36 1 -> /dev/pts/14
lr-x------ 1 sjr eng 64 Dec 19 10:36 10 -> anon_inode:inotify
lrwx------ 1 sjr eng 64 Dec 19 10:36 11 -> socket:[16910389]
lr-x------ 1 sjr eng 64 Dec 19 10:36 12 -> anon_inode:inotify
lrwx------ 1 sjr eng 64 Dec 19 10:36 13 -> socket:[16910390]
lrwx------ 1 sjr eng 64 Dec 19 10:36 14 -> anon_inode:[eventfd]
lr-x------ 1 sjr eng 64 Dec 19 10:36 15 -> anon_inode:inotify
lrwx------ 1 sjr eng 64 Dec 19 10:36 16 -> anon_inode:[eventfd]
lrwx------ 1 sjr eng 64 Dec 19 10:36 18 -> socket:[16901905]
lrwx------ 1 sjr eng 64 Dec 19 10:36 2 -> /dev/pts/14
lrwx------ 1 sjr eng 64 Dec 19 10:36 27 -> anon_inode:[eventfd]
lrwx------ 1 sjr eng 64 Dec 19 10:36 3 -> anon_inode:[eventfd]
lr-x------ 1 sjr eng 64 Dec 19 10:36 4 -> pipe:[16910379]
lrwx------ 1 sjr eng 64 Dec 19 10:36 5 -> socket:[16905452]
l-wx------ 1 sjr eng 64 Dec 19 10:36 6 -> pipe:[16910379]
lrwx------ 1 sjr eng 64 Dec 19 10:36 7 -> socket:[16910380]
lrwx------ 1 sjr eng 64 Dec 19 10:36 8 -> socket:[16910384]
lr-x------ 1 sjr eng 64 Dec 19 10:36 9 -> /var/tmp/kdecache-sjr/ksycoca4

$ lsb_release -rd
Description: Ubuntu 14.04 LTS (upgraded from: Ubuntu 12.04 LTS (upgraded from: Ubuntu 10.04.2 LTS))
Release: 14.04

[Jacob (jacob11)]

Does not only affect Ubuntu. I'm on Fedora 21 with KDE 4.14.3 and have the same strace output when opening the first tab in systemsettings - touchpad - touchpad (mouse click emulation page). 100% is rasing up to 100% and I can only kill it from the command line.

KDE 4.14.3
Fedora 21
Dell M4500 notebook

[James Ring (sjr-f)]

FYI I raised a bug in KDE at https://bugs.kde.org/show_bug.cgi?id=342049