Application: plasmashell (5.12.6)

Qt Version: 5.9.5
Frameworks Version: 5.44.0
Operating System: Linux 4.15.0-38-generic x86_64
Distribution: Ubuntu 18.04.1 LTS

-- Information about the crash:
Occasionally, after booting and logging in, the background desktop and icons will be pushed to the far right side of the screen.  I've found no other way to fix it but to kquitapp5 and kstart plasmashell.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fd42fc8a800 (LWP 1957))]

Thread 8 (Thread 0x7fd36259f700 (LWP 2117)):
#0  0x00007fd423dc3983 in g_main_context_prepare () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fd423dc436b in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd423dc454c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd429ba390b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fd429b489ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fd42996722a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fd364efb747 in KCupsConnection::run() () at /usr/lib/x86_64-linux-gnu/libkcupslib.so
#7  0x00007fd42996c16d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fd428aed6db in start_thread (arg=0x7fd36259f700) at pthread_create.c:463
#9  0x00007fd42926788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7fd3763d3700 (LWP 2069)):
#0  0x00007fd42925abf9 in __GI___poll (fds=0x7fd370005610, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fd423dc4439 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd423dc454c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd429ba390b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fd429b489ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fd42996722a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fd42d6732a6 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007fd42996c16d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fd428aed6db in start_thread (arg=0x7fd3763d3700) at pthread_create.c:463
#9  0x00007fd42926788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7fd409d6a700 (LWP 2066)):
#0  0x00007fd428af39f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7fd42f648fb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fd428af39f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7fd42f648f68, cond=0x7fd42f648f90) at pthread_cond_wait.c:502
#2  0x00007fd428af39f3 in __pthread_cond_wait (cond=0x7fd42f648f90, mutex=0x7fd42f648f68) at pthread_cond_wait.c:655
#3  0x00007fd42f3525f4 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#4  0x00007fd42f352639 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#5  0x00007fd428aed6db in start_thread (arg=0x7fd409d6a700) at pthread_create.c:463
#6  0x00007fd42926788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7fd40bdc7700 (LWP 2041)):
#0  0x00007fd42925abf9 in __GI___poll (fds=0x7fd400003ce0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fd423dc4439 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd423dc454c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd429ba390b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fd429b489ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fd42996722a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fd42cad96f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007fd42996c16d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fd428aed6db in start_thread (arg=0x7fd40bdc7700) at pthread_create.c:463
#9  0x00007fd42926788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7fd411e66700 (LWP 2021)):
#0  0x00007fd4292560b4 in __GI___libc_read (fd=10, buf=0x7fd411e65b70, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:27
#1  0x00007fd423e08a00 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd423dc3f27 in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd423dc43e0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fd423dc454c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fd429ba390b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fd429b489ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fd42996722a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fd42cad96f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007fd42996c16d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007fd428aed6db in start_thread (arg=0x7fd411e66700) at pthread_create.c:463
#11 0x00007fd42926788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7fd4138ab700 (LWP 1979)):
#0  0x00007fd4292560b4 in __GI___libc_read (fd=7, buf=0x7fd4138aab60, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:27
#1  0x00007fd423e08a00 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd423dc3f27 in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd423dc43e0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fd423dc454c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fd429ba390b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fd429b489ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fd42996722a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fd42a020d45 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#9  0x00007fd42996c16d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007fd428aed6db in start_thread (arg=0x7fd4138ab700) at pthread_create.c:463
#11 0x00007fd42926788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7fd4199ed700 (LWP 1972)):
#0  0x00007fd42925abf9 in __GI___poll (fds=0x7fd4199ecca8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fd42e27f747 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fd42e28136a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fd41c3862a9 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007fd42996c16d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fd428aed6db in start_thread (arg=0x7fd4199ed700) at pthread_create.c:463
#6  0x00007fd42926788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7fd42fc8a800 (LWP 1957)):
[KCrash Handler]
#6  0x0000000000000000 in  ()
#7  0x00007fd42a39d062 in QWindow::setPosition(QPoint const&) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#8  0x00007fd365e2b369 in  () at /usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/plasma/private/notifications/libnotificationshelperplugin.so
#9  0x00007fd429b796cf in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007fd42a39a5d2 in QWindow::visibleChanged(bool) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#11 0x00007fd42a39fdc0 in QWindow::setVisible(bool) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#12 0x00007fd42a3a0c22 in QWindowPrivate::destroy() () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#13 0x00007fd42a3a0db2 in QWindow::~QWindow() () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#14 0x00007fd42d744004 in QQuickWindow::~QQuickWindow() () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#15 0x00007fd37a18607d in  () at /usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/plasma/core/libcorebindingsplugin.so
#16 0x00007fd365e2b14e in  () at /usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/plasma/private/notifications/libnotificationshelperplugin.so
#17 0x00007fd365e2e62b in  () at /usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/plasma/private/notifications/libnotificationshelperplugin.so
#18 0x00007fd429b7719b in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007fd429b809cb in QObject::~QObject() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007fd42d735455 in QQuickItem::~QQuickItem() () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#21 0x00007fd42d750fad in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#22 0x00007fd429b7719b in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#23 0x00007fd429b809cb in QObject::~QObject() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#24 0x00007fd42d735455 in QQuickItem::~QQuickItem() () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#25 0x00007fd42d751ff5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#26 0x00007fd429b7719b in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#27 0x00007fd429b809cb in QObject::~QObject() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#28 0x00007fd42d735455 in QQuickItem::~QQuickItem() () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#29 0x00007fd42d750fad in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#30 0x00007fd429b7719b in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#31 0x00007fd429b809cb in QObject::~QObject() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#32 0x00007fd42d735455 in QQuickItem::~QQuickItem() () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#33 0x00007fd42d735639 in QQuickItem::~QQuickItem() () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#34 0x00007fd429b7719b in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#35 0x00007fd429b809cb in QObject::~QObject() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#36 0x00007fd42d735455 in QQuickItem::~QQuickItem() () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#37 0x00007fd42d751eb5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#38 0x00007fd429b7719b in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#39 0x00007fd429b809cb in QObject::~QObject() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#40 0x00007fd42d735455 in QQuickItem::~QQuickItem() () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#41 0x00007fd42d7508f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#42 0x00007fd429b7719b in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#43 0x00007fd429b809cb in QObject::~QObject() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#44 0x00007fd42d735455 in QQuickItem::~QQuickItem() () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#45 0x00007fd377ea66c5 in  () at /usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/kquickcontrolsaddons/libkquickcontrolsaddonsplugin.so
#46 0x00007fd42f67dc83 in PlasmaQuick::AppletQuickItem::~AppletQuickItem() () at /usr/lib/x86_64-linux-gnu/libKF5PlasmaQuick.so.5
#47 0x00007fd40bdda7a9 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/plasma/scriptengines/plasma_appletscript_declarative.so
#48 0x00007fd429b7719b in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#49 0x00007fd429b809cb in QObject::~QObject() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#50 0x00007fd40bdd6684 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/plasma/scriptengines/plasma_appletscript_declarative.so
#51 0x00007fd42dde9080 in  () at /usr/lib/x86_64-linux-gnu/libKF5Plasma.so.5
#52 0x00007fd42dde9289 in  () at /usr/lib/x86_64-linux-gnu/libKF5Plasma.so.5
#53 0x00007fd42ddd7769 in Plasma::Applet::~Applet() () at /usr/lib/x86_64-linux-gnu/libKF5Plasma.so.5
#54 0x00007fd3660395c7 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/plasma/applets/plasma_applet_notifications.so
#55 0x00007fd429b7719b in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#56 0x00007fd429b809cb in QObject::~QObject() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#57 0x00007fd40a182259 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/plasma/applets/org.kde.plasma.private.systemtray.so
#58 0x00007fd429b7719b in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#59 0x00007fd429b809cb in QObject::~QObject() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#60 0x00007fd40a7c03b9 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/plasma/applets/org.kde.plasma.systemtray.so
#61 0x00007fd429b7719b in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#62 0x00007fd429b809cb in QObject::~QObject() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#63 0x00007fd42dddba29 in Plasma::Containment::~Containment() () at /usr/lib/x86_64-linux-gnu/libKF5Plasma.so.5
#64 0x000055f710a93469 in  ()
#65 0x000055f710a936f9 in  ()
#66 0x00007fd429b7719b in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#67 0x00007fd429b809cb in QObject::~QObject() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#68 0x000055f710a9f421 in  ()
#69 0x00007fd429b7a140 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#70 0x00007fd42ab5282c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#71 0x00007fd42ab5a0f4 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#72 0x00007fd429b4a9a8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#73 0x00007fd429b4d11d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#74 0x00007fd429b51a9d in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#75 0x000055f710a6ecfa in  ()
#76 0x00007fd429167b97 in __libc_start_main (main=0x55f710a6e320, argc=1, argv=0x7fff3c1ecfb8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff3c1ecfa8) at ../csu/libc-start.c:310
#77 0x000055f710a6f09a in _start ()

Reported using DrKonqi