https://bugs.kde.org/show_bug.cgi?id=431256
Bug ID: 431256
Summary: Shell freezes for more than 2 minutes when opening a
configuration dialog
Product: plasmashell
Version: master
Platform: Other
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: general
Assignee: k...@davidedmundson.co.uk
Reporter: o...@geek.co.il
CC: plasma-b...@kde.org
Target Milestone: 1.0
Using Neon unstable, but this has been happening for quite a while - at least
from 5.18 - though I feel it has become worse in the last few months.
When opening any configuration dialog for the shell - such as the system tray
configuration dialog, audio volume settings, desktop configuration, etc - the
desktop shell freezes for more than 2 minutes - including desktop, panel,
widgets, etc.
I'm running Plasma with the SystemD integration, and looking at the journal,
there aren't many log messages that seem relevant, though I got quite a few
messages in the form of:
Jan 06 22:12:44 vesho plasmashell[53640]: kf.package: No metadata file in the
package, expected it at: "/home/odeda/Documents/Wallpapers/xxx/xxx/"
which, after reviewing I went and added metadata.desktop files to some of those
directories, and as a result these messages have stopped appearing (for
directories where I added new metadata files), but the freezing situation has
not improved.
Still looking at the folders listed, it appears plasmashell scans my wallpaper
directory structure - I have a large wallpaper collection (> 10000 images) in
various directories. I ran `strace -e trace=lstat` on plasmashell, and it looks
like every time a configuration dialog opens (even dialogs not related to
wallpapers), plasmashell scans the path to any image that is in a folder that
was ever configured as a wallpaper folder or wallpaper image. There are a few
additional lstat() that I wasn't surprised to see, such as .desktop file in
~/Desktop and a couple of configuration files, but almost everything else is
wallpaper image files.
Here is a snippet showing lstat usage by plasmashell for scanning **just one**
such image:
----8<----
[pid 4478] 11:08:42 lstat("/home", {st_mode=S_IFDIR|0755, st_size=64, ...}) =
0
[pid 4478] 11:08:42 lstat("/home/odeda", {st_mode=S_IFDIR|0755, st_size=4960,
...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents", {st_mode=S_IFDIR|0755,
st_size=2244, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents/mobile",
{st_mode=S_IFDIR|0777, st_size=418, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents/mobile/media",
{st_mode=S_IFDIR|0777, st_size=92, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents/mobile/media/Walls",
{st_mode=S_IFDIR|0777, st_size=316, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents/mobile/media/Walls/art",
{st_mode=S_IFDIR|0777, st_size=256, ...}) = 0
[pid 4478] 11:08:42
lstat("/home/odeda/Documents/mobile/media/Walls/art/original",
{st_mode=S_IFDIR|0775, st_size=45706, ...}) = 0
[pid 4478] 11:08:42 lstat("/home", {st_mode=S_IFDIR|0755, st_size=64, ...}) =
0
[pid 4478] 11:08:42 lstat("/home/odeda", {st_mode=S_IFDIR|0755, st_size=4960,
...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents", {st_mode=S_IFDIR|0755,
st_size=2244, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents/mobile",
{st_mode=S_IFDIR|0777, st_size=418, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents/mobile/media",
{st_mode=S_IFDIR|0777, st_size=92, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents/mobile/media/Walls",
{st_mode=S_IFDIR|0777, st_size=316, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents/mobile/media/Walls/art",
{st_mode=S_IFDIR|0777, st_size=256, ...}) = 0
[pid 4478] 11:08:42
lstat("/home/odeda/Documents/mobile/media/Walls/art/original",
{st_mode=S_IFDIR|0775, st_size=45706, ...}) = 0
[pid 4478] 11:08:42 lstat("/home", {st_mode=S_IFDIR|0755, st_size=64, ...}) =
0
[pid 4478] 11:08:42 lstat("/home/odeda", {st_mode=S_IFDIR|0755, st_size=4960,
...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/.local", {st_mode=S_IFDIR|0755,
st_size=482, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/.local/share", {st_mode=S_IFDIR|0755,
st_size=5326, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/.local/share/wallpapers",
{st_mode=S_IFDIR|0775, st_size=208, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/.local/share/wallpapers/art-original",
{st_mode=S_IFLNK|0777, st_size=54, ...}) = 0
[pid 4478] 11:08:42 lstat("/home", {st_mode=S_IFDIR|0755, st_size=64, ...}) =
0
[pid 4478] 11:08:42 lstat("/home/odeda", {st_mode=S_IFDIR|0755, st_size=4960,
...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents", {st_mode=S_IFDIR|0755,
st_size=2244, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents/mobile",
{st_mode=S_IFDIR|0777, st_size=418, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents/mobile/media",
{st_mode=S_IFDIR|0777, st_size=92, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents/mobile/media/Walls",
{st_mode=S_IFDIR|0777, st_size=316, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents/mobile/media/Walls/art",
{st_mode=S_IFDIR|0777, st_size=256, ...}) = 0
[pid 4478] 11:08:42
lstat("/home/odeda/Documents/mobile/media/Walls/art/original",
{st_mode=S_IFDIR|0775, st_size=45706, ...}) = 0
[pid 4478] 11:08:42
lstat("/home/odeda/Documents/mobile/media/Walls/art/original/Dl7wmzRUwAAKssm.jpeg",
{st_mode=S_IFREG|0664, st_size=325843, ...}) = 0
[pid 4478] 11:08:42 lstat("/home", {st_mode=S_IFDIR|0755, st_size=64, ...}) =
0
[pid 4478] 11:08:42 lstat("/home/odeda", {st_mode=S_IFDIR|0755, st_size=4960,
...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/.local", {st_mode=S_IFDIR|0755,
st_size=482, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/.local/share", {st_mode=S_IFDIR|0755,
st_size=5326, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/.local/share/wallpapers",
{st_mode=S_IFDIR|0775, st_size=208, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/.local/share/wallpapers/art-original",
{st_mode=S_IFLNK|0777, st_size=54, ...}) = 0
[pid 4478] 11:08:42 lstat("/home", {st_mode=S_IFDIR|0755, st_size=64, ...}) =
0
[pid 4478] 11:08:42 lstat("/home/odeda", {st_mode=S_IFDIR|0755, st_size=4960,
...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents", {st_mode=S_IFDIR|0755,
st_size=2244, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents/mobile",
{st_mode=S_IFDIR|0777, st_size=418, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents/mobile/media",
{st_mode=S_IFDIR|0777, st_size=92, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents/mobile/media/Walls",
{st_mode=S_IFDIR|0777, st_size=316, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents/mobile/media/Walls/art",
{st_mode=S_IFDIR|0777, st_size=256, ...}) = 0
[pid 4478] 11:08:42
lstat("/home/odeda/Documents/mobile/media/Walls/art/original",
{st_mode=S_IFDIR|0775, st_size=45706, ...}) = 0
[pid 4478] 11:08:42
lstat("/home/odeda/Documents/mobile/media/Walls/art/original/Dl7wmzRUwAAKssm.jpeg",
{st_mode=S_IFREG|0664, st_size=325843, ...}) = 0
[pid 4478] 11:08:42 lstat("/home", {st_mode=S_IFDIR|0755, st_size=64, ...}) =
0
[pid 4478] 11:08:42 lstat("/home/odeda", {st_mode=S_IFDIR|0755, st_size=4960,
...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/.local", {st_mode=S_IFDIR|0755,
st_size=482, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/.local/share", {st_mode=S_IFDIR|0755,
st_size=5326, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/.local/share/wallpapers",
{st_mode=S_IFDIR|0775, st_size=208, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/.local/share/wallpapers/art-original",
{st_mode=S_IFLNK|0777, st_size=54, ...}) = 0
[pid 4478] 11:08:42 lstat("/home", {st_mode=S_IFDIR|0755, st_size=64, ...}) =
0
[pid 4478] 11:08:42 lstat("/home/odeda", {st_mode=S_IFDIR|0755, st_size=4960,
...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents", {st_mode=S_IFDIR|0755,
st_size=2244, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents/mobile",
{st_mode=S_IFDIR|0777, st_size=418, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents/mobile/media",
{st_mode=S_IFDIR|0777, st_size=92, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents/mobile/media/Walls",
{st_mode=S_IFDIR|0777, st_size=316, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents/mobile/media/Walls/art",
{st_mode=S_IFDIR|0777, st_size=256, ...}) = 0
[pid 4478] 11:08:42
lstat("/home/odeda/Documents/mobile/media/Walls/art/original",
{st_mode=S_IFDIR|0775, st_size=45706, ...}) = 0
[pid 4478] 11:08:42
lstat("/home/odeda/Documents/mobile/media/Walls/art/original/Dl7wmzRUwAAKssm.jpeg",
{st_mode=S_IFREG|0664, st_size=325843, ...}) = 0
[pid 4478] 11:08:42 lstat("/home", {st_mode=S_IFDIR|0755, st_size=64, ...}) =
0
[pid 4478] 11:08:42 lstat("/home/odeda", {st_mode=S_IFDIR|0755, st_size=4960,
...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents", {st_mode=S_IFDIR|0755,
st_size=2244, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents/mobile",
{st_mode=S_IFDIR|0777, st_size=418, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents/mobile/media",
{st_mode=S_IFDIR|0777, st_size=92, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents/mobile/media/Walls",
{st_mode=S_IFDIR|0777, st_size=316, ...}) = 0
[pid 4478] 11:08:42 lstat("/home/odeda/Documents/mobile/media/Walls/art",
{st_mode=S_IFDIR|0777, st_size=256, ...}) = 0
[pid 4478] 11:08:42
lstat("/home/odeda/Documents/mobile/media/Walls/art/original",
{st_mode=S_IFDIR|0775, st_size=45706, ...}) = 0
[pid 4478] 11:08:42
lstat("/home/odeda/Documents/mobile/media/Walls/art/original/Dl7wmzRUwAAKssm.jpeg",
{st_mode=S_IFREG|0664, st_size=325843, ...}) = 0
----8<----
This is then repeated many thousands of times.
When reviewing the full log, I think I see several different patterns of
access, including a few additional catatonic patterns in child processes, and
the above pattern is just one of them. I put the full log - about 400MB
uncompressed - here:
http://code.geek.co.il/dumps/plasmashell-journal-lstat.log.gz
BTW, I'm not really sure where the list of folders to scan comes from: the way
I set up my system is that I have set up the ~/.local/share/wallpapers
directory to contain symbolic links to specific themed folders in my wallpaper
collection (such as Walls/art/original shown above), but not all of the folder
that exist there, and indeed when looking at the lstat log - plasmashell scans
just the folders linked from ~/.local/share/wallpapers. The problem is that I
don't understand where plasmashell finds that configuration - it is not
mentioned in ~/.config/plasma-org.kde.plasma.desktop-appletsrc, but if I open
the wallpaper configuration dialog and choose "Slideshow", the folder list is
pre-populated with
~/.local/share/wallpapers,/usr/share/plasma/wallpapers,/usr/share/wallpapers -
which are all the directories scanned in the log - and I have no idea where it
is getting that default configuration from.
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