Application: plasmashell (5.9.5)

Qt Version: 5.8.0
Frameworks Version: 5.33.0
Operating System: Linux 4.10.11-1-ARCH x86_64
Distribution (Platform): Archlinux Packages

-- Information about the crash:
- What I was doing when the application crashed:

When I was unchecking force dpi in font size menu in systemsettings plasma crash out of sudden.

The crash can be reproduced sometimes.

-- Backtrace:
Application: Plazma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fabc2142c80 (LWP 3361))]

Thread 7 (Thread 0x7faaea0d2700 (LWP 3632)):
#0  0x00007fabbb7e767d in poll () at /usr/lib/libc.so.6
#1  0x00007fabb48cb9b6 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007fabb48cbacc in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007fabbc11010b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7faadc0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4  0x00007fabbc0b993a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7faaea0d1d90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#5  0x00007fabbbedbae3 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:507
#6  0x00007fabbf01a025 in  () at /usr/lib/libQt5Qml.so.5
#7  0x00007fabbbee0748 in QThreadPrivate::start(void*) (arg=0x63f89d0) at thread/qthread_unix.cpp:368
#8  0x00007fabbad932e7 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007fabbb7f154f in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7fab0cd0e700 (LWP 3546)):
#0  0x00007fabbb7e767d in poll () at /usr/lib/libc.so.6
#1  0x00007fabb48cb9b6 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007fabb48cbacc in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007fabbc11010b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fab080008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4  0x00007fabbc0b993a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fab0cd0dd40, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#5  0x00007fabbbedbae3 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:507
#6  0x00007fabbfbcdfd6 in  () at /usr/lib/libQt5Quick.so.5
#7  0x00007fabbbee0748 in QThreadPrivate::start(void*) (arg=0x2fa16f0) at thread/qthread_unix.cpp:368
#8  0x00007fabbad932e7 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007fabbb7f154f in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7fab97fff700 (LWP 3545)):
#0  0x00007fabbad99756 in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007fabc18c1234 in  () at /usr/lib/libQt5Script.so.5
#2  0x00007fabc18c1279 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007fabbad932e7 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007fabbb7f154f in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7faba2586700 (LWP 3459)):
#0  0x00007fabbb7e767d in poll () at /usr/lib/libc.so.6
#1  0x00007fabb48cb9b6 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007fabb48cbacc in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007fabbc11010b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fab900008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4  0x00007fabbc0b993a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7faba2585d90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#5  0x00007fabbbedbae3 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:507
#6  0x00007fabbf01a025 in  () at /usr/lib/libQt5Qml.so.5
#7  0x00007fabbbee0748 in QThreadPrivate::start(void*) (arg=0x2817d00) at thread/qthread_unix.cpp:368
#8  0x00007fabbad932e7 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007fabbb7f154f in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7faba3fff700 (LWP 3424)):
#0  0x00007fabbb7e337d in read () at /usr/lib/libc.so.6
#1  0x00007fabb490fe20 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007fabb48cb47e in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#3  0x00007fabb48cb954 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007fabb48cbacc in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#5  0x00007fabbc11010b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fab980008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#6  0x00007fabbc0b993a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7faba3ffed90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#7  0x00007fabbbedbae3 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:507
#8  0x00007fabbf01a025 in  () at /usr/lib/libQt5Qml.so.5
#9  0x00007fabbbee0748 in QThreadPrivate::start(void*) (arg=0x27c45c0) at thread/qthread_unix.cpp:368
#10 0x00007fabbad932e7 in start_thread () at /usr/lib/libpthread.so.0
#11 0x00007fabbb7f154f in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7fabaa08c700 (LWP 3384)):
#0  0x00007fabb49111c9 in g_mutex_lock () at /usr/lib/libglib-2.0.so.0
#1  0x00007fabb48cae99 in g_main_context_prepare () at /usr/lib/libglib-2.0.so.0
#2  0x00007fabb48cb8db in  () at /usr/lib/libglib-2.0.so.0
#3  0x00007fabb48cbacc in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#4  0x00007fabbc11010b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fab9c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#5  0x00007fabbc0b993a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fabaa08bd80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#6  0x00007fabbbedbae3 in QThread::exec() (this=this@entry=0x7fabbced5d60 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread.cpp:507
#7  0x00007fabbcc61835 in QDBusConnectionManager::run() (this=0x7fabbced5d60 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at qdbusconnection.cpp:170
#8  0x00007fabbbee0748 in QThreadPrivate::start(void*) (arg=0x7fabbced5d60 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread_unix.cpp:368
#9  0x00007fabbad932e7 in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007fabbb7f154f in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7fabc2142c80 (LWP 3361)):
[KCrash Handler]
#6  0x00007fabbfc78d16 in QQuickItemPrivate::setEffectiveVisibleRecur(bool) () at /usr/lib/libQt5Quick.so.5
#7  0x00007fabbfc78dea in QQuickItemPrivate::setEffectiveVisibleRecur(bool) () at /usr/lib/libQt5Quick.so.5
#8  0x00007fabbfc78dea in QQuickItemPrivate::setEffectiveVisibleRecur(bool) () at /usr/lib/libQt5Quick.so.5
#9  0x00007fabbfc78f44 in QQuickItem::setVisible(bool) () at /usr/lib/libQt5Quick.so.5
#10 0x00007fabc1bf482c in  () at /usr/lib/libKF5PlasmaQuick.so.5
#11 0x00007fabc1bf5f6e in PlasmaQuick::Dialog::event(QEvent*) () at /usr/lib/libKF5PlasmaQuick.so.5
#12 0x00007fabbd02f3dc in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=<optimized out>, receiver=0x4cf7cf0, e=0x7ffcd9ce8d40) at kernel/qapplication.cpp:3745
#13 0x00007fabbd036bf1 in QApplication::notify(QObject*, QEvent*) (this=0x7ffcd9cebde0, receiver=0x4cf7cf0, e=0x7ffcd9ce8d40) at kernel/qapplication.cpp:3502
#14 0x00007fabbc0bb4e0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=receiver@entry=0x4cf7cf0, event=event@entry=0x7ffcd9ce8d40) at kernel/qcoreapplication.cpp:988
#15 0x00007fabbc6147ce in QCoreApplication::sendEvent(QObject*, QEvent*) (event=0x7ffcd9ce8d40, receiver=0x4cf7cf0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#16 0x00007fabbc6147ce in QWindow::setVisible(bool) (this=0x4cf7cf0, visible=<optimized out>) at kernel/qwindow.cpp:537
#17 0x00007fabc1bf2124 in PlasmaQuick::Dialog::setVisible(bool) () at /usr/lib/libKF5PlasmaQuick.so.5
#18 0x00007fabc1bf4fb8 in  () at /usr/lib/libKF5PlasmaQuick.so.5
#19 0x00007fabc1bf670b in PlasmaQuick::Dialog::qt_metacall(QMetaObject::Call, int, void**) () at /usr/lib/libKF5PlasmaQuick.so.5
#20 0x00007fabbef8dac9 in  () at /usr/lib/libQt5Qml.so.5
#21 0x00007fabbef8c498 in QQmlPropertyPrivate::write(QObject*, QQmlPropertyData const&, QVariant const&, QQmlContextData*, QFlags<QQmlPropertyData::WriteFlag>) () at /usr/lib/libQt5Qml.so.5
#22 0x00007fabbef56b7b in QV4::QObjectWrapper::setProperty(QV4::ExecutionEngine*, QObject*, QQmlPropertyData*, QV4::Value const&) () at /usr/lib/libQt5Qml.so.5
#23 0x00007fabbef57390 in QV4::QObjectWrapper::setQmlProperty(QV4::ExecutionEngine*, QQmlContextData*, QObject*, QV4::String*, QV4::QObjectWrapper::RevisionMode, QV4::Value const&) () at /usr/lib/libQt5Qml.so.5
#24 0x00007fabbef574a6 in QV4::QObjectWrapper::put(QV4::Managed*, QV4::String*, QV4::Value const&) () at /usr/lib/libQt5Qml.so.5
#25 0x00007fabbef67f56 in QV4::Runtime::method_setProperty(QV4::ExecutionEngine*, QV4::Value const&, int, QV4::Value const&) () at /usr/lib/libQt5Qml.so.5
#26 0x00007faba0357f42 in  ()
#27 0x0000000002822010 in  ()
#28 0x00007faba0358504 in  ()
#29 0x0000000000000000 in  ()

Reported using DrKonqi