Bug 388816

Application: systemsettings5 (5.11.4)

Qt Version: 5.9.2
Frameworks Version: 5.41.0
Operating System: Linux 4.14.11-300.fc27.x86_64 x86_64
Distribution: "Fedora release 27 (Twenty Seven)"

-- Information about the crash:
- What I was doing when the application crashed:
  It can be reproduced after using systemsettings for some time. I suspect it has to do with some stateful change that occurs after leaving one of the kcms. This time, I used the mouse and touchpad kcms before the crash, but I've seen this happen with others as well.

The crash can be reproduced sometimes.

-- Backtrace:
Application: System Settings (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7ffff7f9c4c0 (LWP 15885))]

Thread 5 (Thread 0x7fffc5d23700 (LWP 15891)):
#0  0x00007ffff206636b in poll () from /lib64/libc.so.6
#1  0x00007fffe9fa4ed9 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#2  0x00007fffe9fa4fec in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007ffff2ed135b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#4  0x00007ffff2e7f0ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007ffff2cd08ba in QThread::exec() () from /lib64/libQt5Core.so.5
#6  0x00007ffff11d72a5 in QQmlThreadPrivate::run() () from /lib64/libQt5Qml.so.5
#7  0x00007ffff2cd4b92 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#8  0x00007fffee2cd61b in start_thread () from /lib64/libpthread.so.0
#9  0x00007ffff207291f in clone () from /lib64/libc.so.6

Thread 4 (Thread 0x7fffcd9fb700 (LWP 15890)):
#0  0x00007ffff206636b in poll () from /lib64/libc.so.6
#1  0x00007fffe9fa4ed9 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#2  0x00007fffe9fa4fec in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007ffff2ed135b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#4  0x00007ffff2e7f0ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007ffff2cd08ba in QThread::exec() () from /lib64/libQt5Core.so.5
#6  0x00007ffff11d72a5 in QQmlThreadPrivate::run() () from /lib64/libQt5Qml.so.5
#7  0x00007ffff2cd4b92 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#8  0x00007fffee2cd61b in start_thread () from /lib64/libpthread.so.0
#9  0x00007ffff207291f in clone () from /lib64/libc.so.6

Thread 3 (Thread 0x7fffdb531700 (LWP 15887)):
#0  0x00007ffff2061888 in read () from /lib64/libc.so.6
#1  0x00007fffe9fe90e0 in g_wakeup_acknowledge () from /lib64/libglib-2.0.so.0
#2  0x00007fffe9fa49e8 in g_main_context_check () from /lib64/libglib-2.0.so.0
#3  0x00007fffe9fa4e80 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#4  0x00007fffe9fa4fec in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#5  0x00007ffff2ed135b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#6  0x00007ffff2e7f0ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#7  0x00007ffff2cd08ba in QThread::exec() () from /lib64/libQt5Core.so.5
#8  0x00007ffff32e7479 in QDBusConnectionManager::run() () from /lib64/libQt5DBus.so.5
#9  0x00007ffff2cd4b92 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#10 0x00007fffee2cd61b in start_thread () from /lib64/libpthread.so.0
#11 0x00007ffff207291f in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7fffe4832700 (LWP 15886)):
#0  0x00007ffff206636b in poll () from /lib64/libc.so.6
#1  0x00007fffee90dfe7 in _xcb_conn_wait () from /lib64/libxcb.so.1
#2  0x00007fffee90fdda in xcb_wait_for_event () from /lib64/libxcb.so.1
#3  0x00007fffe73d0a49 in QXcbEventReader::run() () from /lib64/libQt5XcbQpa.so.5
#4  0x00007ffff2cd4b92 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#5  0x00007fffee2cd61b in start_thread () from /lib64/libpthread.so.0
#6  0x00007ffff207291f in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7ffff7f9c4c0 (LWP 15885)):
[KCrash Handler]
#6  0x00007ffff16cdf94 in QQuickItem::isVisible() const () from /lib64/libQt5Quick.so.5
#7  0x00007ffff16ce0a9 in QQuickKeysAttached::keyReleased(QKeyEvent*, bool) () from /lib64/libQt5Quick.so.5
#8  0x00007ffff16d9d9a in QQuickItemPrivate::deliverKeyEvent(QKeyEvent*) () from /lib64/libQt5Quick.so.5
#9  0x00007ffff16da125 in QQuickItem::event(QEvent*) () from /lib64/libQt5Quick.so.5
#10 0x00007ffff4dea6ac in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#11 0x00007ffff4df1ef4 in QApplication::notify(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#12 0x00007ffff2e80367 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /lib64/libQt5Core.so.5
#13 0x00007ffff16eb408 in QQuickWindow::sendEvent(QQuickItem*, QEvent*) () from /lib64/libQt5Quick.so.5
#14 0x00007ffff16eb71f in QQuickWindow::keyReleaseEvent(QKeyEvent*) () from /lib64/libQt5Quick.so.5
#15 0x00007ffff46dcf35 in QWindow::event(QEvent*) () from /lib64/libQt5Gui.so.5
#16 0x00007ffff16f2b65 in QQuickWindow::event(QEvent*) () from /lib64/libQt5Quick.so.5
#17 0x00007ffff4dea6ac in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#18 0x00007ffff4df1ef4 in QApplication::notify(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#19 0x00007ffff2e80367 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /lib64/libQt5Core.so.5
#20 0x00007ffff1d54a3c in QQuickWidget::keyReleaseEvent(QKeyEvent*) () from /lib64/libQt5QuickWidgets.so.5
#21 0x00007ffff4e28e28 in QWidget::event(QEvent*) () from /lib64/libQt5Widgets.so.5
#22 0x00007ffff4dea6ac in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#23 0x00007ffff4df3432 in QApplication::notify(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#24 0x00007ffff2e80367 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /lib64/libQt5Core.so.5
#25 0x00007ffff4e4625a in QWidgetWindow::event(QEvent*) () from /lib64/libQt5Widgets.so.5
#26 0x00007ffff4dea6ac in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#27 0x00007ffff4df1ef4 in QApplication::notify(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#28 0x00007ffff2e80367 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /lib64/libQt5Core.so.5
#29 0x00007ffff46cdef0 in QGuiApplicationPrivate::processKeyEvent(QWindowSystemInterfacePrivate::KeyEvent*) () from /lib64/libQt5Gui.so.5
#30 0x00007ffff46d3315 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () from /lib64/libQt5Gui.so.5
#31 0x00007ffff46ad1ab in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Gui.so.5
#32 0x00007fffe74337d0 in userEventSourceDispatch(_GSource*, int (*)(void*), void*) () from /lib64/libQt5XcbQpa.so.5
#33 0x00007fffe9fa4bb7 in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#34 0x00007fffe9fa4f60 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#35 0x00007fffe9fa4fec in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#36 0x00007ffff2ed133f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#37 0x00007ffff2e7f0ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#38 0x00007ffff2e87744 in QCoreApplication::exec() () from /lib64/libQt5Core.so.5
#39 0x000055555555fe8f in main (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/plasma-systemsettings-5.11.4-1.fc27.x86_64/app/main.cpp:65

Possible duplicates by query: bug 385718.

Reported using DrKonqi