plasmashell crashes on startup when the following conditions are met: Task Manager sorting is set to "Do Not Sort" "Show a Launcher When Not Running" has been selected for an application which is not running during plasmashell startup Started happening with Plasma 5.6, still present in 5.6.1 (using Arch Linux, Qt 5.5 was updated not 5.6 at the same time I updated from Plasma 5.5 to 5.6) Reproducible with a fresh user account Reproducible: Always Steps to Reproduce: With a newly created user account: 1. On first login, a default plasmashell layout is created (startup log and config file "~/.config/plasma-org.kde.plasma.desktop-appletsrc" pasted below in additional information) 2. Right click on Task Manager, click "Task Manager Settings...". Under "Grouping and Sorting", select "Do Not Sort". 3. Open an application (eg. Dolphin), right click on it in the Task Manager and select "Show a Launcher When Not Running". Full config after these changes is pasted below in Additional Information. Relevant changes seem to be: > [Containments][1][Applets][4][Configuration][General] > launchers=file:///usr/share/applications/org.kde.dolphin.desktop?wmClass=dolphin > sortingStrategy=0 4. Close the application you just added a launcher for (a launcher icon will show up). 5. Restart plasmashell (either by logout/login or from command line). Actual Results: After restart, plasmashell ends up in "stopped" state, leaving a blank desktop. No wallpaper, Task Manager etc are shown. (krunner/kwin still work fine) Notes: - Changing either one of the config options on its own does not seem to cause any issues. - After the config is changed, everything seems to work as expected, the issue only occurs when plasmashell is starting up - If the application for which there is a launcher on the taskbar is running when plasmashell is started, everything works as expected. Expected Results: plasmashell starts up normally, with a launcher showing for any application which is not running and without sorting any applications in the Task Manager. I am including the output from starting plasmashell as there seem to be some errors or unexpected behavior eg multiple occurences of "QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling." Not sure if this is related... I have also pasted the autogenerated config from after the first startup of plasmashell in case this is useful, as well as after making the changes. My computer is a Lenovo T430s with integrated Intel HD4000 graphics and a 1600x900 screen (no external monitor attached for these tests with a newly created user account). Can post additional configuration details if required. =========================================================== plasmashell output on first run =========================================================== kscreen: starting external backend launcher for "" Plasma Shell startup completed evaluating startup script: "/usr/share/plasma/shells/org.kde.plasma.desktop/contents/layout.js" org.kde.plasma: unversioned plugin detected, may result in instability org.kde.plasma: unversioned plugin detected, may result in instability org.kde.plasma: unversioned plugin detected, may result in instability org.kde.plasma: unversioned plugin detected, may result in instability org.kde.plasma: unversioned plugin detected, may result in instability org.kde.plasma: unversioned plugin detected, may result in instability Setting default Containment plugin: "undefined" org.kde.plasma: unversioned plugin detected, may result in instability "1" Could not resolve property : radialGradient4857 Could not resolve property : radialGradient4857 Could not resolve property : radialGradient4857 Could not resolve property : radialGradient4857 Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString) file:///usr/lib/qt/qml/org/kde/plasma/extras/ScrollArea.qml:48: Error: Cannot assign to non-existent property "interactive" file:///usr/lib/qt/qml/QtQuick/Controls/Button.qml:96: TypeError: Cannot read property of null file:///usr/lib/qt/qml/QtQuick/Controls/Button.qml:96: TypeError: Cannot read property of null file:///usr/lib/qt/qml/QtQuick/Controls/Button.qml:96: TypeError: Cannot read property of null file:///usr/share/plasma/plasmoids/org.kde.plasma.taskmanager/contents/ui/ToolTipDelegate.qml:220: TypeError: Cannot read property '0' of undefined file:///usr/share/plasma/plasmoids/org.kde.plasma.taskmanager/contents/ui/ToolTipDelegate.qml:209: TypeError: Cannot read property '0' of undefined file:///usr/lib/qt/qml/QtQuick/Controls/Button.qml:96: TypeError: Cannot read property of null QObject::connect: invalid null parameter file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/main.qml:51: TypeError: Cannot read property 'width' of null file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/main.qml:52: TypeError: Cannot read property 'width' of null file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/main.qml:53: TypeError: Cannot read property 'height' of null file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/main.qml:54: TypeError: Cannot read property 'height' of null file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/Tooltip.qml:43: TypeError: Cannot read property 'timeFormat' of null Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/DigitalClock.qml:443:5: QML Text: Cannot anchor to a null item. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Known plasmoid ids: QHash() org.kde.plasma: unversioned plugin detected, may result in instability <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. org.kde.plasma.pulseaudio: Attempting connection to PulseAudio sound daemon org.kde.plasma.pulseaudio: QHash((261, "Properties")(262, "Volume")(263, "Muted")(257, "Index")(258, "PulseObject")(259, "ObjectName")(268, "CardIndex")(269, "Ports")(270, "ActivePortIndex")(264, "HasVolume")(265, "VolumeWritable")(266, "Name")(267, "Description")(260, "Index")) org.kde.plasma.pulseaudio: QHash((261, "Properties")(262, "Volume")(263, "Muted")(257, "Index")(258, "PulseObject")(259, "ObjectName")(268, "CardIndex")(269, "Ports")(270, "ActivePortIndex")(264, "HasVolume")(265, "VolumeWritable")(266, "Name")(267, "Description")(260, "Index")) file:///usr/lib/qt/qml/org/kde/plasma/extras/ScrollArea.qml:48: Error: Cannot assign to non-existent property "interactive" org.kde.plasma: unversioned plugin detected, may result in instability <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. log_klipper: Failed to load history resource. Clipboard history cannot be read. : History file does not exist file:///usr/share/plasma/plasmoids/org.kde.plasma.systemtray/contents/ui/TaskDelegate.qml:156: TypeError: Cannot read property 'taskItem' of undefined file:///usr/share/plasma/plasmoids/org.kde.plasma.clipboard/contents/ui/clipboard.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.clipboard/contents/ui/clipboard.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.clipboard/contents/ui/clipboard.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.clipboard/contents/ui/clipboard.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. org.kde.plasma: unversioned plugin detected, may result in instability <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.systemtray/contents/ui/TaskDelegate.qml:156: TypeError: Cannot read property 'taskItem' of undefined file:///usr/share/plasma/plasmoids/org.kde.plasma.devicenotifier/contents/ui/devicenotifier.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.devicenotifier/contents/ui/devicenotifier.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.devicenotifier/contents/ui/devicenotifier.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.devicenotifier/contents/ui/devicenotifier.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. org.kde.plasma: unversioned plugin detected, may result in instability file:///usr/share/plasma/plasmoids/org.kde.plasma.devicenotifier/contents/ui/devicenotifier.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.devicenotifier/contents/ui/devicenotifier.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.devicenotifier/contents/ui/devicenotifier.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.devicenotifier/contents/ui/devicenotifier.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. file:///usr/share/plasma/plasmoids/org.kde.plasma.systemtray/contents/ui/TaskDelegate.qml:156: TypeError: Cannot read property 'taskItem' of undefined <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. Notifications service registered XSync seems available and ready XSync Inited Supported, init completed file:///usr/lib/qt/qml/QtQuick/Controls/Button.qml:96: TypeError: Cannot read property of null file:///usr/share/plasma/plasmoids/org.kde.plasma.taskmanager/contents/ui/ToolTipDelegate.qml:220: TypeError: Cannot read property '0' of undefined file:///usr/share/plasma/plasmoids/org.kde.plasma.taskmanager/contents/ui/ToolTipDelegate.qml:209: TypeError: Cannot read property '0' of undefined file:///usr/share/plasma/plasmoids/org.kde.plasma.systemtray/contents/ui/TaskDelegate.qml:156: TypeError: Cannot read property 'taskItem' of undefined file:///usr/share/plasma/plasmoids/org.kde.plasma.notifications/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.notifications/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.notifications/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.notifications/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. org.kde.plasma: unversioned plugin detected, may result in instability <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. libkcups: Create-Printer-Subscriptions last error: 0 successful-ok libkcups: Get-Jobs last error: 0 successful-ok libkcups: Get-Jobs last error: 0 successful-ok file:///usr/share/plasma/plasmoids/org.kde.plasma.systemtray/contents/ui/TaskDelegate.qml:156: TypeError: Cannot read property 'taskItem' of undefined file:///usr/share/plasma/plasmoids/org.kde.plasma.printmanager/contents/ui/printmanager.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.printmanager/contents/ui/printmanager.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.printmanager/contents/ui/printmanager.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.printmanager/contents/ui/printmanager.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. libkcups: 0 libkcups: 0 ST : DBus service "org.kde.Solid.PowerManagement" appeared. Loading "org.kde.plasma.battery" org.kde.plasma: unversioned plugin detected, may result in instability <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. Both point size and pixel size set. Using pixel size. file:///usr/share/plasma/plasmoids/org.kde.plasma.systemtray/contents/ui/TaskDelegate.qml:156: TypeError: Cannot read property 'taskItem' of undefined file:///usr/share/plasma/plasmoids/org.kde.plasma.battery/contents/ui/batterymonitor.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.battery/contents/ui/batterymonitor.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.battery/contents/ui/batterymonitor.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.battery/contents/ui/batterymonitor.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. ST : DBus service "org.freedesktop.Telepathy.MissionControl5" appeared. Loading "org.kde.ktp-contactlist" org.kde.plasma: unversioned plugin detected, may result in instability <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. file:///usr/share/plasma/plasmoids/org.kde.ktp-contactlist/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.ktp-contactlist/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.ktp-contactlist/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.ktp-contactlist/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. ST : DBus service "org.bluez" appeared. Loading "org.kde.plasma.bluetooth" org.kde.plasma: unversioned plugin detected, may result in instability file:///usr/share/plasma/plasmoids/org.kde.ktp-contactlist/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.ktp-contactlist/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.ktp-contactlist/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.ktp-contactlist/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.systemtray/contents/ui/TaskDelegate.qml:156: TypeError: Cannot read property 'taskItem' of undefined file:///usr/share/plasma/plasmoids/org.kde.plasma.bluetooth/contents/ui/BluetoothApplet.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.bluetooth/contents/ui/BluetoothApplet.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.bluetooth/contents/ui/BluetoothApplet.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.bluetooth/contents/ui/BluetoothApplet.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. ST : DBus service "org.freedesktop.NetworkManager" appeared. Loading "org.kde.plasma.networkmanagement" org.kde.plasma: unversioned plugin detected, may result in instability file:///usr/share/plasma/plasmoids/org.kde.plasma.bluetooth/contents/ui/BluetoothApplet.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.bluetooth/contents/ui/BluetoothApplet.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.bluetooth/contents/ui/BluetoothApplet.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.bluetooth/contents/ui/BluetoothApplet.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.bluetooth/contents/ui/BluetoothApplet.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.bluetooth/contents/ui/BluetoothApplet.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.bluetooth/contents/ui/BluetoothApplet.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.bluetooth/contents/ui/BluetoothApplet.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. <Unknown File>: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. Both point size and pixel size set. Using pixel size. org.kde.plasma.pulseaudio: state callback networkmanager-qt: void NetworkManager::NetworkManagerPrivate::propertiesChanged(const QVariantMap&) Unhandled property "Devices" file:///usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. ktp-common-internals: Current presence changed ktp-common-internals: Current presence changed file:///usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. file:///usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling. org.kde.plasma.pulseaudio: state callback org.kde.plasma.pulseaudio: state callback org.kde.plasma.pulseaudio: ready =========================================================== Autogenerated config after first startup ("~.config/plasma-org.kde.plasma.desktop-appletsrc") =========================================================== [ActionPlugins][0] MidButton;NoModifier=org.kde.paste RightButton;NoModifier=org.kde.contextmenu wheel:Vertical;NoModifier=org.kde.switchdesktop [ActionPlugins][1] RightButton;NoModifier=org.kde.contextmenu [ActionPlugins][127] RightButton;NoModifier=org.kde.contextmenu [Containments][1] activityId= formfactor=2 immutability=1 lastScreen=0 location=4 plugin=org.kde.panel wallpaperplugin=org.kde.image [Containments][1][Applets][2] immutability=1 plugin=org.kde.plasma.kickoff [Containments][1][Applets][2][Configuration][General] favorites=preferred://browser,systemsettings.desktop,org.kde.dolphin.desktop,org.kde.kate.desktop [Containments][1][Applets][2][Configuration][Shortcuts] global=Alt+F1 [Containments][1][Applets][2][Shortcuts] global=Alt+F1 [Containments][1][Applets][3] immutability=1 plugin=org.kde.plasma.pager [Containments][1][Applets][4] immutability=1 plugin=org.kde.plasma.taskmanager [Containments][1][Applets][5] immutability=1 plugin=org.kde.plasma.systemtray [Containments][1][Applets][5][Configuration][Containments][8] formfactor=2 location=4 [Containments][1][Applets][5][Configuration][Containments][8][Applets][10] immutability=1 plugin=org.kde.plasma.clipboard [Containments][1][Applets][5][Configuration][Containments][8][Applets][11] immutability=1 plugin=org.kde.plasma.devicenotifier [Containments][1][Applets][5][Configuration][Containments][8][Applets][12] immutability=1 plugin=org.kde.kdeconnect [Containments][1][Applets][5][Configuration][Containments][8][Applets][13] immutability=1 plugin=org.kde.plasma.notifications [Containments][1][Applets][5][Configuration][Containments][8][Applets][14] immutability=1 plugin=org.kde.plasma.printmanager [Containments][1][Applets][5][Configuration][Containments][8][Applets][15] immutability=1 plugin=org.kde.plasma.battery [Containments][1][Applets][5][Configuration][Containments][8][Applets][16] immutability=1 plugin=org.kde.ktp-contactlist [Containments][1][Applets][5][Configuration][Containments][8][Applets][17] immutability=1 plugin=org.kde.plasma.bluetooth [Containments][1][Applets][5][Configuration][Containments][8][Applets][18] immutability=1 plugin=org.kde.plasma.networkmanagement [Containments][1][Applets][5][Configuration][Containments][8][Applets][9] immutability=1 plugin=org.kde.plasma.volume [Containments][1][Applets][5][Configuration][General] extraItems=org.kde.plasma.clipboard,org.kde.plasma.bluetooth,org.kde.plasma.mediacontroller,org.kde.plasma.networkmanagement,org.kde.plasma.battery,org.kde.plasma.printmanager,org.kde.plasma.notifications,org.kde.plasma.volume,org.kde.ktp-contactlist,org.kde.kdeconnect,org.kde.plasma.devicenotifier knownItems=org.kde.plasma.clipboard,org.kde.plasma.bluetooth,org.kde.plasma.mediacontroller,org.kde.plasma.networkmanagement,org.kde.plasma.battery,org.kde.plasma.printmanager,org.kde.plasma.notifications,org.kde.plasma.volume,org.kde.ktp-contactlist,org.kde.kdeconnect,org.kde.plasma.devicenotifier [Containments][1][Applets][6] immutability=1 plugin=org.kde.plasma.digitalclock [Containments][1][General] AppletOrder=2;3;4;5;6 [Containments][7] activityId=1720a928-9274-4a72-8e5d-9d45238952fd formfactor=0 immutability=1 lastScreen=0 location=0 plugin=org.kde.desktopcontainment wallpaperplugin=org.kde.image [Containments][7][Wallpaper][org.kde.image][General] height=900 width=1600 =========================================================== plasmashell startup output with changed config =========================================================== kscreen: starting external backend launcher for "" org.kde.plasma: unversioned plugin detected, may result in instability org.kde.plasma: unversioned plugin detected, may result in instability org.kde.plasma: unversioned plugin detected, may result in instability org.kde.plasma: unversioned plugin detected, may result in instability org.kde.plasma: unversioned plugin detected, may result in instability org.kde.plasma: unversioned plugin detected, may result in instability org.kde.plasma: unversioned plugin detected, may result in instability Could not resolve property : radialGradient4857 Could not resolve property : radialGradient4857 Could not resolve property : radialGradient4857 Could not resolve property : radialGradient4857 Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString) file:///usr/lib/qt/qml/org/kde/plasma/extras/ScrollArea.qml:48: Error: Cannot assign to non-existent property "interactive" file:///usr/lib/qt/qml/QtQuick/Controls/Button.qml:96: TypeError: Cannot read property of null file:///usr/lib/qt/qml/QtQuick/Controls/Button.qml:96: TypeError: Cannot read property of null file:///usr/lib/qt/qml/QtQuick/Controls/Button.qml:96: TypeError: Cannot read property of null file:///usr/share/plasma/plasmoids/org.kde.plasma.taskmanager/contents/ui/ToolTipDelegate.qml:220: TypeError: Cannot read property '0' of undefined file:///usr/share/plasma/plasmoids/org.kde.plasma.taskmanager/contents/ui/ToolTipDelegate.qml:209: TypeError: Cannot read property '0' of undefined file:///usr/lib/qt/qml/QtQuick/Controls/Button.qml:96: TypeError: Cannot read property of null KCrash: Attempting to start /usr/bin/plasmashell from kdeinit KCrash: Application 'plasmashell' crashing... KCrash: Attempting to start /usr/lib/drkonqi from kdeinit QSocketNotifier: Invalid socket 8 and type 'Read', disabling... QSocketNotifier: Invalid socket 17 and type 'Read', disabling... =========================================================== changed config =========================================================== [ActionPlugins][0] MidButton;NoModifier=org.kde.paste RightButton;NoModifier=org.kde.contextmenu wheel:Vertical;NoModifier=org.kde.switchdesktop [ActionPlugins][1] RightButton;NoModifier=org.kde.contextmenu [ActionPlugins][127] RightButton;NoModifier=org.kde.contextmenu [Containments][1] activityId= formfactor=2 immutability=1 lastScreen=0 location=4 plugin=org.kde.panel wallpaperplugin=org.kde.image [Containments][1][Applets][2] immutability=1 plugin=org.kde.plasma.kickoff [Containments][1][Applets][2][Configuration][General] favorites=preferred://browser,systemsettings.desktop,org.kde.dolphin.desktop,org.kde.kate.desktop [Containments][1][Applets][2][Configuration][Shortcuts] global=Alt+F1 [Containments][1][Applets][2][Shortcuts] global=Alt+F1 [Containments][1][Applets][3] immutability=1 plugin=org.kde.plasma.pager [Containments][1][Applets][4] immutability=1 plugin=org.kde.plasma.taskmanager [Containments][1][Applets][4][Configuration][ConfigDialog] DialogHeight=540 DialogWidth=720 [Containments][1][Applets][4][Configuration][General] launchers=file:///usr/share/applications/org.kde.dolphin.desktop?wmClass=dolphin sortingStrategy=0 [Containments][1][Applets][5] immutability=1 plugin=org.kde.plasma.systemtray [Containments][1][Applets][5][Configuration][Containments][8] formfactor=2 location=4 [Containments][1][Applets][5][Configuration][Containments][8][Applets][10] immutability=1 plugin=org.kde.plasma.clipboard [Containments][1][Applets][5][Configuration][Containments][8][Applets][11] immutability=1 plugin=org.kde.plasma.devicenotifier [Containments][1][Applets][5][Configuration][Containments][8][Applets][12] immutability=1 plugin=org.kde.kdeconnect [Containments][1][Applets][5][Configuration][Containments][8][Applets][13] immutability=1 plugin=org.kde.plasma.notifications [Containments][1][Applets][5][Configuration][Containments][8][Applets][14] immutability=1 plugin=org.kde.plasma.printmanager [Containments][1][Applets][5][Configuration][Containments][8][Applets][15] immutability=1 plugin=org.kde.plasma.battery [Containments][1][Applets][5][Configuration][Containments][8][Applets][16] immutability=1 plugin=org.kde.ktp-contactlist [Containments][1][Applets][5][Configuration][Containments][8][Applets][17] immutability=1 plugin=org.kde.plasma.bluetooth [Containments][1][Applets][5][Configuration][Containments][8][Applets][18] immutability=1 plugin=org.kde.plasma.networkmanagement [Containments][1][Applets][5][Configuration][Containments][8][Applets][9] immutability=1 plugin=org.kde.plasma.volume [Containments][1][Applets][5][Configuration][General] extraItems=org.kde.plasma.clipboard,org.kde.plasma.bluetooth,org.kde.plasma.mediacontroller,org.kde.plasma.networkmanagement,org.kde.plasma.battery,org.kde.plasma.printmanager,org.kde.plasma.notifications,org.kde.plasma.volume,org.kde.ktp-contactlist,org.kde.kdeconnect,org.kde.plasma.devicenotifier knownItems=org.kde.plasma.clipboard,org.kde.plasma.bluetooth,org.kde.plasma.mediacontroller,org.kde.plasma.networkmanagement,org.kde.plasma.battery,org.kde.plasma.printmanager,org.kde.plasma.notifications,org.kde.plasma.volume,org.kde.ktp-contactlist,org.kde.kdeconnect,org.kde.plasma.devicenotifier [Containments][1][Applets][6] immutability=1 plugin=org.kde.plasma.digitalclock [Containments][1][General] AppletOrder=2;3;4;5;6 [Containments][7] activityId=1720a928-9274-4a72-8e5d-9d45238952fd formfactor=0 immutability=1 lastScreen=0 location=0 plugin=org.kde.desktopcontainment wallpaperplugin=org.kde.image [Containments][7][Wallpaper][org.kde.image][General] height=900 width=1600
Backtrace?
Starting program: /usr/bin/plasmashell [Thread debugging using libthread_db enabled] Using host libthread_db library "/usr/lib/libthread_db.so.1". [New Thread 0x7fffe0d50700 (LWP 23613)] [New Thread 0x7fffdafe9700 (LWP 23614)] [New Thread 0x7fffd97a9700 (LWP 23615)] [New Thread 0x7fffc8bd2700 (LWP 23616)] [New Thread 0x7fffc2fa4700 (LWP 23617)] [New Thread 0x7fffc175f700 (LWP 23618)] [New Thread 0x7fff3aba0700 (LWP 23619)] Thread 1 "plasmashell" received signal SIGSEGV, Segmentation fault. TaskManager::AbstractSortingStrategy::check (this=0x0, itemToCheck=itemToCheck@entry=0x2a4b750) at /tmp/makepkg/plasma-workspace/src/plasma-workspace-5.6.1/libtaskmanager/abstractsortingstrategy.cpp:142 142 sortItems(sortedList);
Thanks so much for this - I've been going round in circles for days trying to fix my system, falsely thinking this was to do with Qt 5.6, Mesa or the Kernel
Git commit 55180f86b1b78206decea94c4d332bd8b2efe7ba by Eike Hein. Committed on 31/03/2016 at 07:25. Pushed by hein into branch 'Plasma/5.6'. Don't crash on launchers with sorting disabled. M +3 -1 libtaskmanager/groupmanager.cpp http://commits.kde.org/plasma-workspace/55180f86b1b78206decea94c4d332bd8b2efe7ba
I also am bitten by this bug on two local machines and have altered plasma-org.kde.plasma.desktop-appletsrc removed any launcher line and changed sortingStrategy=1 and both system immediately became accessable. tks ps: RESOLVED FIXED maybe but not yet published to openSUSE Tumbleweed as of 20160412!