Bug 460966

Application: plasmashell (5.26.1)

Qt Version: 5.15.6
Frameworks Version: 5.99.0
Operating System: Linux 5.15.0-52-generic x86_64
Windowing System: X11
Distribution: KDE neon 5.26
DrKonqi: 5.26.1 [KCrashBackend]

-- Information about the crash:
This started to happen after upgrading from KDE Neon 20.04 to 22.04. Tried to clear ~/.config/kwinrc but that didn't help. 

After running plasmashell --replace, I keep getting this:

QObject: Cannot create children for a parent that is in a different thread.

QObject: Cannot create children for a parent that is in a different thread.
(Parent is Breeze::WidgetStateEngine(0x557a4f1ba500), parent's thread is QThread(0x557a4eb5b5b0), current thread is QQuickPixmapReader(0x557a500f92b0)
QObject: Cannot create children for a parent that is in a different thread.
(Parent is Breeze::WidgetStateEngine(0x557a4f1ba500), parent's thread is QThread(0x557a4eb5b5b0), current thread is QQuickPixmapReader(0x557a500f92b0)
QObject: Cannot create children for a parent that is in a different thread.
(Parent is Breeze::ScrollBarEngine(0x557a4f1c9df0), parent's thread is QThread(0x557a4eb5b5b0), current thread is QQuickPixmapReader(0x557a500f92b0)
QObject: Cannot create children for a parent that is in a different thread.
(Parent is Breeze::ScrollBarEngine(0x557a4f1c9df0), parent's thread is QThread(0x557a4eb5b5b0), current thread is QQuickPixmapReader(0x557a500f92b0)
QObject: Cannot create children for a parent that is in a different thread.
(Parent is Breeze::WidgetStateEngine(0x557a4f1ba500), parent's thread is QThread(0x557a4eb5b5b0), current thread is QQuickPixmapReader(0x557a500f92b0)
QObject: Cannot create children for a parent that is in a different thread.
(Parent is Breeze::WidgetStateEngine(0x557a4f1ba500), parent's thread is QThread(0x557a4eb5b5b0), current thread is QQuickPixmapReader(0x557a500f92b0)
QObject: Cannot create children for a parent that is in a different thread.
(Parent is Breeze::ScrollBarEngine(0x557a4f1c9df0), parent's thread is QThread(0x557a4eb5b5b0), current thread is QQuickPixmapReader(0x557a500f92b0)
QObject: Cannot create children for a parent that is in a different thread.
(Parent is Breeze::ScrollBarEngine(0x557a4f1c9df0), parent's thread is QThread(0x557a4eb5b5b0), current thread is QQuickPixmapReader(0x557a500f92b0)
QObject: Cannot create children for a parent that is in a different thread.

The crash can be reproduced every time.

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

[KCrash Handler]
#4  0x00007f8bd8446f44 in QTextDocument::docHandle() const () at /lib/x86_64-linux-gnu/libQt5Gui.so.5
#5  0x00007f8bd843e91c in QTextFrame::begin() const () at /lib/x86_64-linux-gnu/libQt5Gui.so.5
#6  0x00007f8bd84826f0 in  () at /lib/x86_64-linux-gnu/libQt5Gui.so.5
#7  0x00007f8bd8482d0e in  () at /lib/x86_64-linux-gnu/libQt5Gui.so.5
#8  0x00007f8bd8483328 in QTextDocumentLayout::doLayout(int, int, int) () at /lib/x86_64-linux-gnu/libQt5Gui.so.5
#9  0x00007f8bd84846bb in QTextDocumentLayout::documentChanged(int, int, int) () at /lib/x86_64-linux-gnu/libQt5Gui.so.5
#10 0x00007f8bd845c938 in QTextDocumentPrivate::clear() () at /lib/x86_64-linux-gnu/libQt5Gui.so.5
#11 0x00007f8bd84451dd in QTextDocument::setPlainText(QString const&) () at /lib/x86_64-linux-gnu/libQt5Gui.so.5
#12 0x00007f8bd8d81edb in  () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#13 0x00007f8bd8d8330d in  () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#14 0x00007f8bd8d83e0f in  () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#15 0x00007f8bd8d85ecb in QLabel::paintEvent(QPaintEvent*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#16 0x00007f8bd8c8487e in QWidget::event(QEvent*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#17 0x00007f8bd8d32bf2 in QFrame::event(QEvent*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#18 0x00007f8bd8c41763 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#19 0x00007f8bd7f39fea in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007f8bd8c7c7ca in QWidgetPrivate::sendPaintEvent(QRegion const&) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#21 0x00007f8bd8c7cff2 in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, QFlags<QWidgetPrivate::DrawWidgetFlag>, QPainter*, QWidgetRepaintManager*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#22 0x00007f8bd8c7e430 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, QFlags<QWidgetPrivate::DrawWidgetFlag>, QPainter*, QWidgetRepaintManager*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#23 0x00007f8bd8c7e25f in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, QFlags<QWidgetPrivate::DrawWidgetFlag>, QPainter*, QWidgetRepaintManager*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#24 0x00007f8bd8c7cd0c in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, QFlags<QWidgetPrivate::DrawWidgetFlag>, QPainter*, QWidgetRepaintManager*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#25 0x00007f8bd8c7e430 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, QFlags<QWidgetPrivate::DrawWidgetFlag>, QPainter*, QWidgetRepaintManager*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#26 0x00007f8bd8c7e25f in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, QFlags<QWidgetPrivate::DrawWidgetFlag>, QPainter*, QWidgetRepaintManager*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#27 0x00007f8bd8c7cd0c in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, QFlags<QWidgetPrivate::DrawWidgetFlag>, QPainter*, QWidgetRepaintManager*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#28 0x00007f8bd8c52a05 in  () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#29 0x00007f8bd8c531e3 in  () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#30 0x00007f8bd8ca163c in  () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#31 0x00007f8bd8c41763 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#32 0x00007f8bd7f39fea in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#33 0x00007f8bd8327e91 in QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) () at /lib/x86_64-linux-gnu/libQt5Gui.so.5
#34 0x00007f8bd82faacc in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Gui.so.5
#35 0x00007f8bd3346c4e in  () at /lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#36 0x00007f8bd6163d1b in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#37 0x00007f8bd61b86f8 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#38 0x00007f8bd61613c3 in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#39 0x00007f8bd7f936f8 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#40 0x00007f8bd7f3890b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#41 0x00007f8bd7f40ea4 in QCoreApplication::exec() () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#42 0x0000561903544834 in  ()
#43 0x00007f8bd7855d90 in __libc_start_call_main (main=main@entry=0x561903543920, argc=argc@entry=2, argv=argv@entry=0x7ffd75ab47e8) at ../sysdeps/nptl/libc_start_call_main.h:58
#44 0x00007f8bd7855e40 in __libc_start_main_impl (main=0x561903543920, argc=2, argv=0x7ffd75ab47e8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffd75ab47d8) at ../csu/libc-start.c:392
#45 0x0000561903544955 in  ()
[Inferior 1 (process 756053) detached]

Reported using DrKonqi