Bug 341495

Summary:	plasma-desktop hangs with 100% cpu
Product:	[Plasma] plasma4	Reporter:	Christian Degenkolb <degenkolb>
Component:	general	Assignee:	Plasma Bugs List <plasma-bugs>
Status:	RESOLVED UNMAINTAINED
Severity:	normal	CC:	cfeck, danikpastushchak90
Priority:	NOR
Version:	unspecified
Target Milestone:	---
Platform:	Kubuntu
OS:	Linux
Latest Commit:		Version Fixed In:

Description Christian Degenkolb 2014-12-02 17:17:26 UTC

Since upgrading to KDE 4.14.2 in random intervals (from 5 minutes to hours) the process plasma-desktop takes up 100% CPU. 

Changing desktops or opening new programs is then not possible. However the already open applications are still usable.

Currently I kill plasma-desktop and restart it by hand. This helps until the next lock up.

The last output in the terminal where I restart plasma-desktop is always

void DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*): "Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken."

This gets repeated every minute or so until I kill the frozen process and restart it.

Reproducible: Always

Steps to Reproduce:
1. Login into KDE 4.14.2
2. Wait between 5 minutes to an hour
3.  plasma-desktop takes up 100% CPU and freezes



KDE is installed from the 4.14.2 packages for Ubuntu trusty from https://launchpad.net/~kubuntu-ppa/+archive/ubuntu/backports?field.series_filter=trusty

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 14.04.1 LTS
Release:        14.04
Codename:       trusty

Comment 1 Christoph Feck 2014-12-02 18:38:51 UTC

This is either caused by a faulty plasma widget, or by a faulty kded module. To find the offender, please try to remove specific widgets, or try to disable kded modules. For further information about debugging kded, please see http://kdepepo.wordpress.com/2011/05/11/troubleshooting-kded4-bugs/

Comment 2 Daniel Pastushchak 2014-12-15 20:32:28 UTC

Comment from GCI student:
I use Ubuntu 14.10 with KDE 4.14.2 and everything works good!

Comment 3 Christian Degenkolb 2015-06-24 14:06:24 UTC

I found the culprit. Every time I run the winswitch_applet from https://winswitch.org for approximately an hour the error message appears and plasma-desktop freezes.
This also happens at KDE 4.14.2

The ticket for winswitch can be found at https://winswitch.org/trac/ticket/278#ticket

Christian

Comment 4 Nate Graham 2018-06-08 18:14:25 UTC

Hello!

This bug report was filed for KDE Plasma 4, which reached end-of-support status in August 2015. KDE Plasma 5's desktop shell has been almost completely rewritten for better performance and usability, so it is likely that this bug has already been resolved in Plasma 5.

Accordingly, we hope you understand why we must close this bug report. If the issue described  here is still present in KDE Plasma 5.12 or later, please feel free to open a new ticket in the "plasmashell" product after reading https://community.kde.org/Get_Involved/Bug_Reporting

If you would like to get involved in KDE's bug triaging effort so that future mass bug closes like this are less likely, please read https://community.kde.org/Get_Involved#Bug_Triaging

Thanks for your understanding!

Nate Graham