Bug 430697

Summary:	Plasma shell segfaults on startup: impossible to get a working desktop
Product:	[Plasma] plasmashell	Reporter:	Lorenzo De Marco <lorenzologic>
Component:	generic-crash	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED WORKSFORME
Severity:	grave
Priority:	NOR
Version First Reported In:	5.20.4
Target Milestone:	1.0
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Lorenzo De Marco 2020-12-22 08:28:23 UTC

SUMMARY

Briefly after logging in to my Plasma session today, the shell terminated abruptly. It then restarted and crashed again two times. Eventually, Plasma gave up and Dr. Konqi showed up, allowing me to file a bug. I'm reporting this manually because the tool wasn't able to gather as much information as needed by himself.

STEPS TO REPRODUCE
1. Log in to Plasma (I use SDDM)
2. The desktop crashes in a matter of seconds
3. It keeps restarting and crashing a couple times.

OBSERVED RESULT
Plasma Shell crashes and restarts until you're left with nothing but a black screen (luckily I have Yakuake always open)

EXPECTED RESULT
Plasma Shell starts as usual.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.20.4
KDE Frameworks Version: 5.77.0
Qt Version: 5.15.2
Kernel Version: 5.9.14-arch1-1
OS Type: 64-bit
Processors: 6 × Intel® Core™ i5-9400F CPU @ 2.90GHz
Memory: 7.7 GiB of RAM
Graphics Processor: GeForce GTX 1650/PCIe/SSE2

ADDITIONAL INFORMATION
Application: plasmashell (5.20.4)
-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault

[KCrash Handler]
#4 0x00007f37c99c0002 in () at /usr/lib/qt/qml/org/kde/plasma/calendar/libcalendarplugin.so
#5 0x00007f37e4586582 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#6 0x00007f37e51f5752 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#7 0x00007f37e4559a7a in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#8 0x00007f37e455c573 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt5Core.so.5
#9 0x00007f37e45b30a4 in () at /usr/lib/libQt5Core.so.5
#10 0x00007f37e297ba84 in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#11 0x00007f37e29cf9b1 in () at /usr/lib/libglib-2.0.so.0
#12 0x00007f37e297a2b1 in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#13 0x00007f37e45b26e1 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#14 0x00007f37e45583fc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#15 0x00007f37e4560894 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#16 0x000056366f138069 in ()
#17 0x00007f37e3f24152 in __libc_start_main () at /usr/lib/libc.so.6
#18 0x000056366f1382ae in ()
[Inferior 1 (process 752) detached]

==== Here is the console output I get when issuing 'kstart5 plasmashell' manually, after it crashed a couple times and I'm left with the black screen. My comments start with ~~ on the same line ====

Omitting both --window and --windowclass arguments is not recommended
kf.plasma.quick: Applet preload policy set to 1
Cyclic dependency detected between "file:///usr/lib/qt/qml/org/kde/kirigami.2/styles/org.kde.desktop.plasma/Units.qml" and "file:///usr/lib/qt/qml/org/kde/kirigami.2/styles/org.kde.desktop.plasma/Units.qml"
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:445:13: QML ToolButton: Binding loop detected for property "icon.height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:431:13: QML ToolButton: Binding loop detected for property "icon.height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:411:17: QML ToolButton: Binding loop detected for property "icon.height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:398:17: QML ToolButton: Binding loop detected for property "icon.height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:385:17: QML ToolButton: Binding loop detected for property "icon.height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:372:17: QML ToolButton: Binding loop detected for property "icon.height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:160:13: QML TextArea: Binding loop detected for property "implicitWidth"
trying to show an empty dialog
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:445:13: QML ToolButton: Binding loop detected for property "icon.height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:431:13: QML ToolButton: Binding loop detected for property "icon.height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:411:17: QML ToolButton: Binding loop detected for property "icon.height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:398:17: QML ToolButton: Binding loop detected for property "icon.height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:385:17: QML ToolButton: Binding loop detected for property "icon.height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:372:17: QML ToolButton: Binding loop detected for property "icon.height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:160:13: QML TextArea: Binding loop detected for property "implicitWidth"
Loading Calendar plugin HolidaysEventsPlugin(0x555ab3d06300)
Loading Calendar plugin PimEventsPlugin(0x555ab3d06340)
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.
trying to show an empty dialog
trying to show an empty dialog
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/Autumn" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/BytheWater" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/Canopee" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/Cascade" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/Cluster" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/ColdRipple" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/ColorfulCups" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/DarkestHour" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/Elarun" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/EveningGlow" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/FallenLeaf" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/Flow" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/FlyingKonqui" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/Grey" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/IceCold" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/Kite" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/Kokkini" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/Next" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/OneStandsOut" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/Opal" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/PastelHills" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/Path" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/SafeLanding" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/summer_1am" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/Volna" is a directory. Use addDir!
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:200:17: QML Binding: Not restoring previous value because restoreMode has not been set.
This behavior is deprecated.
You have to import QtQml 2.15 after any QtQuick imports and set
the restoreMode of the binding to fix this warning.
In Qt < 6.0 the default is Binding.RestoreBinding.
In Qt >= 6.0 the default is Binding.RestoreBindingOrValue.

Error: cannot change the containment to AppletsLayout
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:200:17: QML Binding: Not restoring previous value because restoreMode has not been set.
This behavior is deprecated.
You have to import QtQml 2.15 after any QtQuick imports and set
the restoreMode of the binding to fix this warning.
In Qt < 6.0 the default is Binding.RestoreBinding.
In Qt >= 6.0 the default is Binding.RestoreBindingOrValue.

Error: cannot change the containment to AppletsLayout
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:483:13: QML Label: Binding loop detected for property "height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/DigitalClock.qml:510:13: QML Label: Binding loop detected for property "height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/DigitalClock.qml:544:5: QML Label: Binding loop detected for property "height"
trying to show an empty dialog
Loading Calendar plugin HolidaysEventsPlugin(0x555ab3d06300)
Loading Calendar plugin PimEventsPlugin(0x555ab3d06340)
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:524:9: QML Label: Binding loop detected for property "height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/DigitalClock.qml:483:13: QML Label: Binding loop detected for property "height"
trying to show an empty dialog
Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
QFont::setPointSizeF: Point size <= 0 (0.000000), must be greater than 0
trying to show an empty dialog
file:///usr/share/plasma/plasmoids/org.kde.panel/contents/ui/main.qml:30:1: QML DropArea (parent or ancestor of QQuickLayoutAttached): Binding loop detected for property "minimumWidth"
file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/DigitalClock.qml:483:13: QML Label: Binding loop detected for property "height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/DigitalClock.qml:510:13: QML Label: Binding loop detected for property "height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/DigitalClock.qml:544:5: QML Label: Binding loop detected for property "height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/DigitalClock.qml:483:13: QML Label: Binding loop detected for property "height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/DigitalClock.qml:524:9: QML Label: Binding loop detected for property "height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/DigitalClock.qml:544:5: QML Label: Binding loop detected for property "height"
trying to show an empty dialog
file:///usr/share/plasma/plasmoids/org.kde.plasma.panelspacer/contents/ui/main.qml:53:5: Unable to assign [undefined] to QQuickGridLayout*
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.panel/contents/ui/main.qml:30:1: QML DropArea (parent or ancestor of QQuickLayoutAttached): Binding loop detected for property "minimumWidth"
file:///usr/share/ksysguard/sensorfaces/org.kde.ksysguard.linechart/contents/ui/LineChart.qml:77:9: Unable to assign [undefined] to bool
trying to show an empty dialog
file:///usr/share/plasma/plasmoids/org.kde.panel/contents/ui/main.qml:30:1: QML DropArea (parent or ancestor of QQuickLayoutAttached): Binding loop detected for property "minimumWidth"
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Panel.qml:73:5: QML Binding: Not restoring previous value because restoreMode has not been set.
This behavior is deprecated.
You have to import QtQml 2.15 after any QtQuick imports and set
the restoreMode of the binding to fix this warning.
In Qt < 6.0 the default is Binding.RestoreBinding.
In Qt >= 6.0 the default is Binding.RestoreBindingOrValue.

file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Panel.qml:89:5: QML Binding: Not restoring previous value because restoreMode has not been set.
This behavior is deprecated.
You have to import QtQml 2.15 after any QtQuick imports and set
the restoreMode of the binding to fix this warning.
In Qt < 6.0 the default is Binding.RestoreBinding.
In Qt >= 6.0 the default is Binding.RestoreBindingOrValue.

file:///usr/share/ksysguard/sensorfaces/org.kde.ksysguard.linechart/contents/ui/LineChart.qml:77:9: Unable to assign [undefined] to bool
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Panel.qml:73:5: QML Binding: Not restoring previous value because restoreMode has not been set.
This behavior is deprecated.
You have to import QtQml 2.15 after any QtQuick imports and set
the restoreMode of the binding to fix this warning.
In Qt < 6.0 the default is Binding.RestoreBinding.
In Qt >= 6.0 the default is Binding.RestoreBindingOrValue.

file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Panel.qml:73:5: QML Binding: Not restoring previous value because restoreMode has not been set.
This behavior is deprecated.
You have to import QtQml 2.15 after any QtQuick imports and set
the restoreMode of the binding to fix this warning.
In Qt < 6.0 the default is Binding.RestoreBinding.
In Qt >= 6.0 the default is Binding.RestoreBindingOrValue.

file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:200:17: QML Binding: Not restoring previous value because restoreMode has not been set.
This behavior is deprecated.
You have to import QtQml 2.15 after any QtQuick imports and set
the restoreMode of the binding to fix this warning.
In Qt < 6.0 the default is Binding.RestoreBinding.
In Qt >= 6.0 the default is Binding.RestoreBindingOrValue.

Error: cannot change the containment to AppletsLayout
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/Tooltip.qml:66:9: QML GridLayout (parent or ancestor of QQuickLayoutAttached): Binding loop detected for property "minimumWidth"
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/Tooltip.qml:66:9: QML GridLayout (parent or ancestor of QQuickLayoutAttached): Binding loop detected for property "minimumWidth"
file:///usr/share/plasma/plasmoids/org.kde.panel/contents/ui/main.qml:30:1: QML DropArea (parent or ancestor of QQuickLayoutAttached): Binding loop detected for property "maximumHeight"
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.panel/contents/ui/main.qml:30:1: QML DropArea (parent or ancestor of QQuickLayoutAttached): Binding loop detected for property "maximumHeight"
Cyclic dependency detected between "file:///usr/share/plasma/plasmoids/org.kde.plasma.notifications/contents/ui/global/Globals.qml" and "file:///usr/share/plasma/plasmoids/org.kde.plasma.notifications/contents/ui/NotificationHeader.qml"
libkcups: CUPS-Get-Printers last error: 0 successful-ok
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/lib/qt/qml/org/kde/plasma/extras/PlasmoidHeading.qml:56:5: Unable to assign [undefined] to int
Plasma Shell startup completed
Plasma Shell startup completed
Plasma Shell startup completed
libkcups: 3 "Camera"
libkcups: 0
libkcups: 0
trying to show an empty dialog
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"
trying to show an empty dialog
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"
trying to show an empty dialog
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"
KAStatsFavoritesModel::setFavorites is ignored
QQuickItem::stackAfter: Cannot stack ConditionalLoader_QMLTYPE_148_QML_387(0x555ab5c8f520, parent=0x555ab5ba8d50, geometry=0,0 0x0) after ConditionalLoader_QMLTYPE_148_QML_387(0x555ab5c74030), which must be a sibling
QQuickItem::stackAfter: Cannot stack ConditionalLoader_QMLTYPE_148_QML_387(0x555ab5c86490, parent=0x555ab5ba8d50, geometry=0,0 0x0) after ConditionalLoader_QMLTYPE_148_QML_387(0x555ab5c8f520), which must be a sibling
QQuickItem::stackAfter: Cannot stack ConditionalLoader_QMLTYPE_148_QML_387(0x555ab5c94bf0, parent=0x555ab5ba8d50, geometry=0,0 0x0) after ConditionalLoader_QMLTYPE_148_QML_387(0x555ab5c86490), which must be a sibling
QQuickItem::stackAfter: Cannot stack ConditionalLoader_QMLTYPE_148_QML_387(0x555ab5c99ca0, parent=0x555ab5ba8d50, geometry=0,0 0x0) after ConditionalLoader_QMLTYPE_148_QML_387(0x555ab5c94bf0), which must be a sibling
QQuickItem::stackAfter: Cannot stack ConditionalLoader_QMLTYPE_148_QML_387(0x555ab5c9f2b0, parent=0x555ab5ba8d50, geometry=0,0 0x0) after ConditionalLoader_QMLTYPE_148_QML_387(0x555ab5c99ca0), which must be a sibling
trying to show an empty dialog
Model size of -2147483647 is less than 0
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:254: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:254: TypeError: Cannot read property 'value' of undefined
kf.kio.core: We got some errors while running testparm "Error loading services."
kf.kio.core: We got some errors while running 'net usershare info'
kf.kio.core: "Can't load /etc/samba/smb.conf - run testparm to debug it\n"
file:///usr/lib/qt/qml/org/kde/plasma/extras/PlasmoidHeading.qml:56:5: Unable to assign [undefined] to int
ktp-common-internals: Current presence changed: "offline" ""
ktp-common-internals: Requested presence changed: "offline" ""
ktp-common-internals: Account "gabble/jabber/google_2dim_6" enabled: true
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.
trying to show an empty dialog
KCrash: Attempting to start /usr/bin/plasmashell
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = plasmashell path = /usr/bin pid = 2452
KCrash: Arguments: /usr/bin/plasmashell
KCrash: Attempting to start /usr/lib/drkonqi
QSocketNotifier: Invalid socket 8 and type 'Read', disabling...
QSocketNotifier: Invalid socket 11 and type 'Read', disabling...
kf.plasma.quick: Applet preload policy set to 1 ~~ now plasmashell restarts unexpectedly
Cyclic dependency detected between "file:///usr/lib/qt/qml/org/kde/kirigami.2/styles/org.kde.desktop.plasma/Units.qml" and "file:///usr/lib/qt/qml/org/kde/kirigami.2/styles/org.kde.desktop.plasma/Units.qml"
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:445:13: QML ToolButton: Binding loop detected for property "icon.height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:431:13: QML ToolButton: Binding loop detected for property "icon.height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:411:17: QML ToolButton: Binding loop detected for property "icon.height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:398:17: QML ToolButton: Binding loop detected for property "icon.height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:385:17: QML ToolButton: Binding loop detected for property "icon.height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:372:17: QML ToolButton: Binding loop detected for property "icon.height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:160:13: QML TextArea: Binding loop detected for property "implicitWidth"
trying to show an empty dialog
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:445:13: QML ToolButton: Binding loop detected for property "icon.height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:431:13: QML ToolButton: Binding loop detected for property "icon.height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:411:17: QML ToolButton: Binding loop detected for property "icon.height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:398:17: QML ToolButton: Binding loop detected for property "icon.height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:385:17: QML ToolButton: Binding loop detected for property "icon.height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:372:17: QML ToolButton: Binding loop detected for property "icon.height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:160:13: QML TextArea: Binding loop detected for property "implicitWidth"
Loading Calendar plugin HolidaysEventsPlugin(0x5642eb0c2f70)
Loading Calendar plugin PimEventsPlugin(0x5642eb0c2fb0)
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.
trying to show an empty dialog
trying to show an empty dialog
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/Autumn" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/BytheWater" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/Canopee" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/Cascade" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/Cluster" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/ColdRipple" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/ColorfulCups" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/DarkestHour" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/Elarun" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/EveningGlow" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/FallenLeaf" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/Flow" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/FlyingKonqui" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/Grey" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/IceCold" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/Kite" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/Kokkini" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/Next" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/OneStandsOut" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/Opal" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/PastelHills" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/Path" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/SafeLanding" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/summer_1am" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/Volna" is a directory. Use addDir!
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:200:17: QML Binding: Not restoring previous value because restoreMode has not been set.
This behavior is deprecated.
You have to import QtQml 2.15 after any QtQuick imports and set
the restoreMode of the binding to fix this warning.
In Qt < 6.0 the default is Binding.RestoreBinding.
In Qt >= 6.0 the default is Binding.RestoreBindingOrValue.

Error: cannot change the containment to AppletsLayout
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:483:13: QML Label: Binding loop detected for property "height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/DigitalClock.qml:510:13: QML Label: Binding loop detected for property "height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/DigitalClock.qml:544:5: QML Label: Binding loop detected for property "height"
trying to show an empty dialog
Loading Calendar plugin HolidaysEventsPlugin(0x5642eb0c2f70)
Loading Calendar plugin PimEventsPlugin(0x5642eb0c2fb0)
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:524:9: QML Label: Binding loop detected for property "height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/DigitalClock.qml:483:13: QML Label: Binding loop detected for property "height"
trying to show an empty dialog
Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
QFont::setPointSizeF: Point size <= 0 (0.000000), must be greater than 0
trying to show an empty dialog
file:///usr/share/plasma/plasmoids/org.kde.panel/contents/ui/main.qml:30:1: QML DropArea (parent or ancestor of QQuickLayoutAttached): Binding loop detected for property "minimumWidth"
file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/DigitalClock.qml:483:13: QML Label: Binding loop detected for property "height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/DigitalClock.qml:510:13: QML Label: Binding loop detected for property "height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/DigitalClock.qml:544:5: QML Label: Binding loop detected for property "height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/DigitalClock.qml:483:13: QML Label: Binding loop detected for property "height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/DigitalClock.qml:524:9: QML Label: Binding loop detected for property "height"
file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/DigitalClock.qml:544:5: QML Label: Binding loop detected for property "height"
trying to show an empty dialog
file:///usr/share/plasma/plasmoids/org.kde.plasma.panelspacer/contents/ui/main.qml:53:5: Unable to assign [undefined] to QQuickGridLayout*
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.panel/contents/ui/main.qml:30:1: QML DropArea (parent or ancestor of QQuickLayoutAttached): Binding loop detected for property "minimumWidth"
file:///usr/share/ksysguard/sensorfaces/org.kde.ksysguard.linechart/contents/ui/LineChart.qml:77:9: Unable to assign [undefined] to bool
trying to show an empty dialog
file:///usr/share/plasma/plasmoids/org.kde.panel/contents/ui/main.qml:30:1: QML DropArea (parent or ancestor of QQuickLayoutAttached): Binding loop detected for property "minimumWidth"
Cyclic dependency detected between "file:///usr/share/plasma/plasmoids/org.kde.plasma.notifications/contents/ui/global/Globals.qml" and "file:///usr/share/plasma/plasmoids/org.kde.plasma.notifications/contents/ui/NotificationHeader.qml"
libkcups: CUPS-Get-Printers last error: 0 successful-ok
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/lib/qt/qml/org/kde/plasma/extras/PlasmoidHeading.qml:56:5: Unable to assign [undefined] to int
Plasma Shell startup completed
Plasma Shell startup completed
Plasma Shell startup completed
libkcups: 3 "Camera"
libkcups: 0
libkcups: 0
trying to show an empty dialog
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"
trying to show an empty dialog
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"
trying to show an empty dialog
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"
KAStatsFavoritesModel::setFavorites is ignored
QQuickItem::stackAfter: Cannot stack ConditionalLoader_QMLTYPE_197_QML_387(0x5642ecf993c0, parent=0x5642eceb27a0, geometry=0,0 0x0) after ConditionalLoader_QMLTYPE_197_QML_387(0x5642ecf7dec0), which must be a sibling
QQuickItem::stackAfter: Cannot stack ConditionalLoader_QMLTYPE_197_QML_387(0x5642ecf903c0, parent=0x5642eceb27a0, geometry=0,0 0x0) after ConditionalLoader_QMLTYPE_197_QML_387(0x5642ecf993c0), which must be a sibling
QQuickItem::stackAfter: Cannot stack ConditionalLoader_QMLTYPE_197_QML_387(0x5642ecf9ec60, parent=0x5642eceb27a0, geometry=0,0 0x0) after ConditionalLoader_QMLTYPE_197_QML_387(0x5642ecf903c0), which must be a sibling
QQuickItem::stackAfter: Cannot stack ConditionalLoader_QMLTYPE_197_QML_387(0x5642ecfa3d10, parent=0x5642eceb27a0, geometry=0,0 0x0) after ConditionalLoader_QMLTYPE_197_QML_387(0x5642ecf9ec60), which must be a sibling
QQuickItem::stackAfter: Cannot stack ConditionalLoader_QMLTYPE_197_QML_387(0x5642ecfa9320, parent=0x5642eceb27a0, geometry=0,0 0x0) after ConditionalLoader_QMLTYPE_197_QML_387(0x5642ecfa3d10), which must be a sibling
trying to show an empty dialog
Model size of -2147483647 is less than 0
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:253: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:254: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:254: TypeError: Cannot read property 'value' of undefined
kf.kio.core: We got some errors while running testparm "Error loading services."
kf.kio.core: We got some errors while running 'net usershare info'
kf.kio.core: "Can't load /etc/samba/smb.conf - run testparm to debug it\n"
file:///usr/lib/qt/qml/org/kde/plasma/extras/PlasmoidHeading.qml:56:5: Unable to assign [undefined] to int
ktp-common-internals: Current presence changed: "offline" ""
ktp-common-internals: Requested presence changed: "offline" ""
ktp-common-internals: Account "gabble/jabber/google_2dim_6" enabled: true ~~ restarts again
file:///usr/lib/qt/qml/org/kde/plasma/components/ModelContextMenu.qml:38:1: QML ModelContextMenu: Accessible must be attached to an Item
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.
trying to show an empty dialog
^C ~~ had to ^C here because it hanged
QSocketNotifier: Invalid socket 30 and type 'Read', disabling...
Unable to start Dr. Konqi
Re-raising signal for core dump handling.
^C ~~ had to ^C here to go back to the shell

Comment 1 Lorenzo De Marco 2020-12-22 08:31:22 UTC

relevant lines in dmesg:
   34.091597] plasmashell[1457]: segfault at 7fb105c8f656 ip 00007fb475511002 sp 00007ffe646eb790 error 4 in libcalendarplugin.so[7fb47550b000+c000]
[   34.091604] Code: 48 0c 48 8d 0c ca 48 89 0c 24 48 39 cb 74 44 66 0f 1f 84 00 00 00 00 00 4c 8b 33 be 2a 00 00 00 48 89 ef 48 83 c3 08 49 8b 06 <4c> 8b 68 60 ff 15 3c da 00 00 4c 89 e2 48 89 ee 4c 89 f7 48 89 84

Comment 2 Lorenzo De Marco 2020-12-22 08:32:58 UTC

tried again, different dmesg output:
[  778.443761] plasmashell[2534]: segfault at 0 ip 0000000000000000 sp 00007ffed3027368 error 14
[  778.443764] Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.

Comment 3 Lorenzo De Marco 2020-12-22 08:50:57 UTC

Yesterday I added a clock widget to one of my panels, and configured it as follows:

[Containments][3][Applets][117]
immutability=1
plugin=org.kde.plasma.digitalclock

[Containments][3][Applets][117][Configuration]
PreloadWeight=42

[Containments][3][Applets][117][Configuration][Appearance]
lastSelectedTimezone=America/New_York
selectedTimeZones=America/New_York,Local
showDate=false
showLocalTimezone=true
use24hFormat=0
wheelChangesTimezone=true

[Containments][3][Applets][117][Configuration][ConfigDialog]
DialogHeight=540
DialogWidth=720


Removing these lines from ~/.config/plasma-org.kde.plasma.desktop-appletsrc fixed this! Yay!
It must be a problem with the clock widget then.