Application: plasmashell (5.16.5)

Qt Version: 5.12.4
Frameworks Version: 5.62.0
Operating System: Linux 5.3.0-19-generic x86_64
Distribution: Ubuntu 19.10

-- Information about the crash:
- What I was doing when the application crashed:
Switched window to firefox via alt-tab, was about to switch to another tab in firefox.

- Unusual behavior I noticed:
Taskbar disappeared (and crashed).

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55b492494b50) at ../sysdeps/unix/sysv/linux/futex-internal.h:80
[Current thread is 1 (Thread 0x7f81c65d0880 (LWP 5838))]

Thread 13 (Thread 0x7f8196731700 (LWP 9826)):
#0  0x00007f81c92f56e0 in futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f8196730c50, clockid=<optimized out>, expected=0, futex_word=0x55b490d31694) at ../sysdeps/unix/sysv/linux/futex-internal.h:208
#1  0x00007f81c92f56e0 in __pthread_cond_wait_common (abstime=0x7f8196730c50, clockid=<optimized out>, mutex=0x55b490d31640, cond=0x55b490d31668) at pthread_cond_wait.c:520
#2  0x00007f81c92f56e0 in __pthread_cond_timedwait (cond=0x55b490d31668, mutex=0x55b490d31640, abstime=0x7f8196730c50) at pthread_cond_wait.c:656
#3  0x00007f81c9e71d5c in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f81c9e71eab in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f81c9e6f451 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f81c9e6bcc2 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f81c92ee669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#8  0x00007f81c9af0323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 12 (Thread 0x7f8195432700 (LWP 9825)):
#0  0x00007f81c92f56e0 in futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f8195431c50, clockid=<optimized out>, expected=0, futex_word=0x55b4924b3df4) at ../sysdeps/unix/sysv/linux/futex-internal.h:208
#1  0x00007f81c92f56e0 in __pthread_cond_wait_common (abstime=0x7f8195431c50, clockid=<optimized out>, mutex=0x55b4924b3da0, cond=0x55b4924b3dc8) at pthread_cond_wait.c:520
#2  0x00007f81c92f56e0 in __pthread_cond_timedwait (cond=0x55b4924b3dc8, mutex=0x55b4924b3da0, abstime=0x7f8195431c50) at pthread_cond_wait.c:656
#3  0x00007f81c9e71d5c in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f81c9e71eab in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f81c9e6f451 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f81c9e6bcc2 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f81c92ee669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#8  0x00007f81c9af0323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 11 (Thread 0x7f8177fff700 (LWP 8260)):
[KCrash Handler]
#6  0x00007f81c990c44a in wl_proxy_marshal_constructor () at /usr/lib/x86_64-linux-gnu/libwayland-client.so.0
#7  0x00007f81c5f8f85b in QtWaylandClient::QWaylandWindow::handleUpdate() () at /usr/lib/x86_64-linux-gnu/libQt5WaylandClient.so.5
#8  0x00007f81beea6740 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/wayland-graphics-integration-client/libqt-plugin-wayland-egl.so
#9  0x00007f81ca4597f1 in QOpenGLContext::swapBuffers(QSurface*) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#10 0x00007f81cbc86caa in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00007f81cbc8a9d8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#12 0x00007f81c9e6bcc2 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007f81c92ee669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#14 0x00007f81c9af0323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7f8195d98700 (LWP 6445)):
#0  0x00007f81c92f52c6 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55b4928edd44) at ../sysdeps/unix/sysv/linux/futex-internal.h:80
#1  0x00007f81c92f52c6 in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55b4928edcf0, cond=0x55b4928edd18) at pthread_cond_wait.c:508
#2  0x00007f81c92f52c6 in __pthread_cond_wait (cond=0x55b4928edd18, mutex=0x55b4928edcf0) at pthread_cond_wait.c:638
#3  0x00007f81c9e71def in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f81c9e71ee1 in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f81cbc8a7b9 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f81cbc8aa1a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f81c9e6bcc2 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f81c92ee669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#9  0x00007f81c9af0323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7f819702b700 (LWP 5978)):
#0  0x00007f81c92f52c6 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55b490ed0d70) at ../sysdeps/unix/sysv/linux/futex-internal.h:80
#1  0x00007f81c92f52c6 in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55b490ed0d20, cond=0x55b490ed0d48) at pthread_cond_wait.c:508
#2  0x00007f81c92f52c6 in __pthread_cond_wait (cond=0x55b490ed0d48, mutex=0x55b490ed0d20) at pthread_cond_wait.c:638
#3  0x00007f81c9e71def in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f81c9e71ee1 in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f81cbc8a7b9 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f81cbc8aa1a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f81c9e6bcc2 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f81c92ee669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#9  0x00007f81c9af0323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7f81a8a17700 (LWP 5974)):
#0  0x00007f81c9ae3c2f in __GI___poll (fds=0x7f819c0025e0, nfds=1, timeout=9655) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f81c8814a3e in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f81c8814b73 in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f81ca08a6c3 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f81ca03163b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f81c9e6aa75 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f81c9e6bcc2 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f81c92ee669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#8  0x00007f81c9af0323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7f81a9218700 (LWP 5973)):
#0  0x00007f81c9adf2ac in __GI___libc_read (nbytes=16, buf=0x7f81a9217ad0, fd=29) at ../sysdeps/unix/sysv/linux/read.c:26
#1  0x00007f81c9adf2ac in __GI___libc_read (fd=29, buf=0x7f81a9217ad0, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:24
#2  0x00007f81c885c63f in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f81c881458e in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f81c88149e2 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f81c8814b73 in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f81ca08a6c3 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f81ca03163b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f81c9e6aa75 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f81a9a0401c in KCupsConnection::run() () at /usr/lib/x86_64-linux-gnu/libkcupslib.so
#10 0x00007f81c9e6bcc2 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007f81c92ee669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#12 0x00007f81c9af0323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f81abfff700 (LWP 5956)):
#0  0x00007f81c92f52c6 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55b48ffde020) at ../sysdeps/unix/sysv/linux/futex-internal.h:80
#1  0x00007f81c92f52c6 in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55b48ffddfd0, cond=0x55b48ffddff8) at pthread_cond_wait.c:508
#2  0x00007f81c92f52c6 in __pthread_cond_wait (cond=0x55b48ffddff8, mutex=0x55b48ffddfd0) at pthread_cond_wait.c:638
#3  0x00007f81c9e71def in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f81c9e71ee1 in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f81cbc8a7b9 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f81cbc8aa1a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f81c9e6bcc2 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f81c92ee669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#9  0x00007f81c9af0323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f81b655c700 (LWP 5953)):
#0  0x00007f81c8860c3d in g_mutex_lock () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f81c8814b5e in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f81ca08a6c3 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f81ca03163b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f81c9e6aa75 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f81cbc028aa in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f81c9e6bcc2 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f81c92ee669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#8  0x00007f81c9af0323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f81bdcdc700 (LWP 5938)):
#0  0x00007f81c92f52c6 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55b48fcf5808) at ../sysdeps/unix/sysv/linux/futex-internal.h:80
#1  0x00007f81c92f52c6 in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55b48fcf57b8, cond=0x55b48fcf57e0) at pthread_cond_wait.c:508
#2  0x00007f81c92f52c6 in __pthread_cond_wait (cond=0x55b48fcf57e0, mutex=0x55b48fcf57b8) at pthread_cond_wait.c:638
#3  0x00007f81be39997b in  () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#4  0x00007f81be39959b in  () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#5  0x00007f81c92ee669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#6  0x00007f81c9af0323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f81bffff700 (LWP 5921)):
#0  0x00007f81c9a65923 in __libc_enable_asynccancel () at ../sysdeps/unix/sysv/linux/x86_64/cancellation.S:56
#1  0x00007f81c9ae3c17 in __GI___poll (fds=0x7f81b80029e0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#2  0x00007f81c8814a3e in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f81c8814b73 in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f81ca08a6c3 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f81ca03163b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f81c9e6aa75 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f81cb92d319 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f81c9e6bcc2 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f81c92ee669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#10 0x00007f81c9af0323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f81c564b700 (LWP 5855)):
#0  0x00007f81c9adf2ac in __GI___libc_read (nbytes=16, buf=0x7f81c564aae0, fd=5) at ../sysdeps/unix/sysv/linux/read.c:26
#1  0x00007f81c9adf2ac in __GI___libc_read (fd=5, buf=0x7f81c564aae0, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:24
#2  0x00007f81c885c63f in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f81c881458e in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f81c88149e2 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f81c8814b73 in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f81ca08a6c3 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f81ca03163b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f81c9e6aa75 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f81ca94fefa in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#10 0x00007f81c9e6bcc2 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007f81c92ee669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#12 0x00007f81c9af0323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f81c65d0880 (LWP 5838)):
#0  0x00007f81c92f52c6 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55b492494b50) at ../sysdeps/unix/sysv/linux/futex-internal.h:80
#1  0x00007f81c92f52c6 in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55b492494b00, cond=0x55b492494b28) at pthread_cond_wait.c:508
#2  0x00007f81c92f52c6 in __pthread_cond_wait (cond=0x55b492494b28, mutex=0x55b492494b00) at pthread_cond_wait.c:638
#3  0x00007f81c9e71def in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f81c9e71ee1 in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f81cbc87f18 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f81cbc8801c in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f81ca427b3d in QWindow::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#8  0x00007f81cbceb67f in QQuickWindow::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#9  0x00007f81cc458ba3 in PlasmaQuick::Dialog::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libKF5PlasmaQuick.so.5
#10 0x00007f81cabcea86 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#11 0x00007f81cabd7e00 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#12 0x00007f81ca032a9a in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007f81ca42772f in QWindowPrivate::setVisible(bool) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#14 0x00007f81cc455b0e in PlasmaQuick::Dialog::setVisible(bool) () at /usr/lib/x86_64-linux-gnu/libKF5PlasmaQuick.so.5
#15 0x00007f81cc458210 in  () at /usr/lib/x86_64-linux-gnu/libKF5PlasmaQuick.so.5
#16 0x00007f81cb902281 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#17 0x00007f81cb902c5b in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#18 0x00007f81cb8ff45b in QQmlBinding::update(QFlags<QQmlPropertyData::WriteFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#19 0x00007f81cb8db053 in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#20 0x00007f81cb87ef62 in QQmlData::signalEmitted(QAbstractDeclarativeData*, QObject*, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#21 0x00007f81ca05dd53 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007f81cc44b796 in PlasmaQuick::AppletQuickItem::expandedChanged(bool) () at /usr/lib/x86_64-linux-gnu/libKF5PlasmaQuick.so.5
#23 0x00007f81cc450681 in PlasmaQuick::AppletQuickItem::setExpanded(bool) () at /usr/lib/x86_64-linux-gnu/libKF5PlasmaQuick.so.5
#24 0x00007f81cc45157b in  () at /usr/lib/x86_64-linux-gnu/libKF5PlasmaQuick.so.5
#25 0x00007f81cc45327b in PlasmaQuick::AppletQuickItem::qt_metacall(QMetaObject::Call, int, void**) () at /usr/lib/x86_64-linux-gnu/libKF5PlasmaQuick.so.5
#26 0x00007f81c41f058a in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/plasma/scriptengines/plasma_appletscript_declarative.so
#27 0x00007f81cb891c26 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#28 0x00007f81cb88e93d in QQmlPropertyPrivate::write(QObject*, QQmlPropertyData const&, QVariant const&, QQmlContextData*, QFlags<QQmlPropertyData::WriteFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#29 0x00007f81cb7d5b59 in QV4::QObjectWrapper::setProperty(QV4::ExecutionEngine*, QObject*, QQmlPropertyData*, QV4::Value const&) () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#30 0x00007f81cb7d64de in QV4::QObjectWrapper::setQmlProperty(QV4::ExecutionEngine*, QQmlContextData*, QObject*, QV4::String*, QV4::QObjectWrapper::RevisionMode, QV4::Value const&) () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#31 0x00007f81cb7d6633 in QV4::QObjectWrapper::virtualPut(QV4::Managed*, QV4::PropertyKey, QV4::Value const&, QV4::Value*) () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#32 0x00007f81cb7527f8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#33 0x00007f81b5cdcf96 in  ()
#34 0x0000000000000000 in  ()
[Inferior 1 (process 5838) detached]

Reported using DrKonqi