Bug 421835

Application: plasmashell (5.18.5)

Qt Version: 5.14.2
Frameworks Version: 5.70.0
Operating System: Linux 5.3.0-53-generic x86_64
Windowing system: X11
Distribution: KDE neon User Edition 5.18

-- Information about the crash:
I dragged the Qt Creator Icon from application launcher and clicked "copy here" in the context menu that appeared. Then I tried to change position of the icon on the desktop, but it crashed instead. After a few seconds it relaunched and the icon was on its original place. When I repeated the actions crash happened again but plasma wouldn't relaunch itself so I had to reboot. The problem happened again after reboot. I'm using KDE Neon user edition from the offcical website with all the updates (available in discover) installed. I didn't really change anything except for global theme (breeeze dark) and enabling wobbly windows. The bug doesn't occur when I try to move icons related to files and links but only when I move application icons (Chromium browser and some steam also made this bug happen).

The crash can be reproduced every time.

-- 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 0x7f1994d863c0 (LWP 1314))]

Thread 7 (Thread 0x7f1943917700 (LWP 1485)):
#0  0x00007f198b4d09f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x556b9cc11fa0) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f198b4d09f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x556b9cc11f50, cond=0x556b9cc11f78) at pthread_cond_wait.c:502
#2  0x00007f198b4d09f3 in __pthread_cond_wait (cond=0x556b9cc11f78, mutex=0x556b9cc11f50) at pthread_cond_wait.c:655
#3  0x00007f198e84e1db in QWaitConditionPrivate::wait(QDeadlineTimer) (deadline=..., this=0x556b9cc11f50) at thread/qwaitcondition_unix.cpp:146
#4  0x00007f198e84e1db in QWaitCondition::wait(QMutex*, QDeadlineTimer) (this=<optimized out>, mutex=0x556b9ca3c2d0, deadline=...) at thread/qwaitcondition_unix.cpp:225
#5  0x00007f198e84e359 in QWaitCondition::wait(QMutex*, unsigned long) (this=0x556b9ca3c2d8, mutex=0x556b9ca3c2d0, time=<optimized out>) at thread/qwaitcondition_unix.cpp:208
#6  0x00007f1992951233 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f1992951691 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007f198e847c2c in QThreadPrivate::start(void*) (arg=0x556b9ca3c230) at thread/qthread_unix.cpp:342
#9  0x00007f198b4ca6db in start_thread (arg=0x7f1943917700) at pthread_create.c:463
#10 0x00007f198e13c88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f195e8a8700 (LWP 1480)):
#0  0x00007f198b4d09f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x556b9be422f4) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f198b4d09f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x556b9be422a0, cond=0x556b9be422c8) at pthread_cond_wait.c:502
#2  0x00007f198b4d09f3 in __pthread_cond_wait (cond=0x556b9be422c8, mutex=0x556b9be422a0) at pthread_cond_wait.c:655
#3  0x00007f198e84e1db in QWaitConditionPrivate::wait(QDeadlineTimer) (deadline=..., this=0x556b9be422a0) at thread/qwaitcondition_unix.cpp:146
#4  0x00007f198e84e1db in QWaitCondition::wait(QMutex*, QDeadlineTimer) (this=<optimized out>, mutex=0x556b9c34adb0, deadline=...) at thread/qwaitcondition_unix.cpp:225
#5  0x00007f198e84e359 in QWaitCondition::wait(QMutex*, unsigned long) (this=0x556b9c34adb8, mutex=0x556b9c34adb0, time=<optimized out>) at thread/qwaitcondition_unix.cpp:208
#6  0x00007f1992951233 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f1992951691 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007f198e847c2c in QThreadPrivate::start(void*) (arg=0x556b9c34ad10) at thread/qthread_unix.cpp:342
#9  0x00007f198b4ca6db in start_thread (arg=0x7f195e8a8700) at pthread_create.c:463
#10 0x00007f198e13c88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f195f80b700 (LWP 1477)):
#0  0x00007f1994bcb587 in _dl_update_slotinfo (req_modid=1) at ../elf/dl-tls.c:643
#1  0x00007f1994bcb87c in update_get_addr (ti=0x7f198ef075c0) at ../elf/dl-tls.c:799
#2  0x00007f1994bd1a28 in __tls_get_addr () at ../sysdeps/x86_64/tls_get_addr.S:55
#3  0x00007f198e846e06 in get_thread_data () at thread/qthread_unix.cpp:173
#4  0x00007f198e846e06 in QThreadData::current(bool) (createIfNecessary=createIfNecessary@entry=true) at thread/qthread_unix.cpp:220
#5  0x00007f198ea966aa in postEventSourcePrepare(GSource*, gint*) (s=0x7f1958004b90, timeout=0x7f195f80ab24) at kernel/qeventdispatcher_glib.cpp:253
#6  0x00007f1987ef3b28 in g_main_context_prepare () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#7  0x00007f1987ef44fb in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#8  0x00007f1987ef46dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#9  0x00007f198ea967cb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f1958000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#10 0x00007f198ea35d2a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f195f80acf0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:225
#11 0x00007f198e846757 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:536
#12 0x00007f1992893b06 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#13 0x00007f198e847c2c in QThreadPrivate::start(void*) (arg=0x556b9c008940) at thread/qthread_unix.cpp:342
#14 0x00007f198b4ca6db in start_thread (arg=0x7f195f80b700) at pthread_create.c:463
#15 0x00007f198e13c88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f1973fff700 (LWP 1473)):
#0  0x00007f1987ef4457 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f1987ef46dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f198ea967cb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f1968000b40, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#3  0x00007f198ea35d2a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f1973ffed40, flags=..., flags@entry=...) at kernel/qeventloop.cpp:225
#4  0x00007f198e846757 in QThread::exec() (this=this@entry=0x556b9bb2fcc0) at thread/qthread.cpp:536
#5  0x00007f19923fdfc5 in QQmlThreadPrivate::run() (this=0x556b9bb2fcc0) at qml/ftw/qqmlthread.cpp:155
#6  0x00007f198e847c2c in QThreadPrivate::start(void*) (arg=0x556b9bb2fcc0) at thread/qthread_unix.cpp:342
#7  0x00007f198b4ca6db in start_thread (arg=0x7f1973fff700) at pthread_create.c:463
#8  0x00007f198e13c88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f197a812700 (LWP 1347)):
#0  0x00007f198ea963bb in socketNotifierSourcePrepare(GSource*, gint*) (timeout=0x7f197a811b64) at kernel/qeventdispatcher_glib.cpp:72
#1  0x00007f1987ef3b28 in g_main_context_prepare () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f1987ef44fb in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f1987ef46dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f198ea967cb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f196c000b40, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#5  0x00007f198ea35d2a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f197a811d30, flags=..., flags@entry=...) at kernel/qeventloop.cpp:225
#6  0x00007f198e846757 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:536
#7  0x00007f1990744555 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#8  0x00007f198e847c2c in QThreadPrivate::start(void*) (arg=0x7f19909bcda0) at thread/qthread_unix.cpp:342
#9  0x00007f198b4ca6db in start_thread (arg=0x7f197a812700) at pthread_create.c:463
#10 0x00007f198e13c88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f197cc0c700 (LWP 1344)):
#0  0x00007f198e12fbf9 in __GI___poll (fds=0x7f197cc0bc68, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f1993563747 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f199356536a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f197f3cdfd0 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f198e847c2c in QThreadPrivate::start(void*) (arg=0x556b9b916c20) at thread/qthread_unix.cpp:342
#5  0x00007f198b4ca6db in start_thread (arg=0x7f197cc0c700) at pthread_create.c:463
#6  0x00007f198e13c88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f1994d863c0 (LWP 1314)):
[KCrash Handler]
#4  0x00007f198e0b2207 in tcache_get (tc_idx=6) at malloc.c:2943
#5  0x00007f198e0b2207 in __GI___libc_malloc (bytes=113) at malloc.c:3050
#6  0x00007f1985bc0321 in  () at /usr/lib/x86_64-linux-gnu/tls/libnvidia-tls.so.340.108
#7  0x00007f198e854412 in QArrayData::allocate(unsigned long, unsigned long, unsigned long, QFlags<QArrayData::AllocationOption>) (objectSize=objectSize@entry=1, alignment=alignment@entry=8, capacity=89, options=...) at tools/qarraydata.cpp:221
#8  0x00007f198e8a4aa5 in QTypedArrayData<char>::allocate(unsigned long, QFlags<QArrayData::AllocationOption>) (options=..., capacity=89) at ../../include/QtCore/../../src/corelib/tools/qarraydata.h:225
#9  0x00007f198e8a4aa5 in QByteArray::reallocData(unsigned int, QFlags<QArrayData::AllocationOption>) (this=this@entry=0x7ffe91ae7148, alloc=89, options=...) at text/qbytearray.cpp:1831
#10 0x00007f19909f1ab5 in QByteArray::detach() (this=0x7ffe91ae7148) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qbytearray.h:500
#11 0x00007f19909f1ab5 in QByteArray::data() (this=0x7ffe91ae7148) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qbytearray.h:494
#12 0x00007f19909f1ab5 in KConfigIniBackend::stringToPrintable(QByteArray const&, KConfigIniBackend::StringType) (aString=..., type=type@entry=KConfigIniBackend::KeyString) at ./src/core/kconfigini.cpp:754
#13 0x00007f19909f2382 in KConfigIniBackend::writeEntries(QByteArray const&, QIODevice&, KEntryMap const&, bool, bool&) (this=this@entry=0x556b9b9e4fa0, locale=..., file=..., map=..., defaultGroup=defaultGroup@entry=false, firstEntry=@0x7ffe91ae7257: false) at ./src/core/kconfigini.cpp:359
#14 0x00007f19909f26a7 in KConfigIniBackend::writeEntries(QByteArray const&, QIODevice&, KEntryMap const&) (this=this@entry=0x556b9b9e4fa0, locale=..., file=..., map=...) at ./src/core/kconfigini.cpp:398
#15 0x00007f19909f4f9c in KConfigIniBackend::writeConfig(QByteArray const&, KEntryMap&, QFlags<KConfigBackend::WriteOption>) (this=<optimized out>, locale=..., entryMap=..., options=...) at ./src/core/kconfigini.cpp:485
#16 0x00007f19909dd6dc in KConfig::sync() (this=0x556b9b9d3e40) at ./src/core/kconfig.cpp:462
#17 0x00007f19909fd9e7 in KCoreConfigSkeleton::save() (this=0x556b9c1f70d0) at ./src/core/kcoreconfigskeleton.cpp:1268
#18 0x00007f1992e7fc27 in KDeclarative::ConfigPropertyMapPrivate::writeConfigValue(QString const&, QVariant const&) (this=0x556b9c1fd3f0, key=..., value=...) at ./src/kdeclarative/configpropertymap.cpp:147
#19 0x00007f198ea726d7 in QtPrivate::QSlotObjectBase::call(QObject*, void**) (a=0x7ffe91ae7590, r=0x556b9c1f8f60, this=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:398
#20 0x00007f198ea726d7 in doActivate<false>(QObject*, int, void**) (sender=0x556b9c1f8f60, signal_index=3, argv=0x7ffe91ae7590) at kernel/qobject.cpp:3870
#21 0x00007f198ea6cf92 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) (sender=<optimized out>, m=m@entry=0x7f1992739f60 <QQmlPropertyMap::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7ffe91ae7590) at kernel/qobject.cpp:3930
#22 0x00007f1992460317 in QQmlPropertyMap::valueChanged(QString const&, QVariant const&) (this=<optimized out>, _t1=..., _t2=...) at .moc/moc_qqmlpropertymap.cpp:143
#23 0x00007f199218cfb5 in QQmlPropertyMapPrivate::emitChanged(QString const&, QVariant const&) (value=..., key=..., this=0x556b9c212550) at util/qqmlpropertymap.cpp:102
#24 0x00007f199218cfb5 in QQmlPropertyMapMetaObject::propertyWritten(int) (this=0x556b9c2212c0, index=<optimized out>) at util/qqmlpropertymap.cpp:125
#25 0x00007f19923288f7 in QQmlOpenMetaObject::metaCall(QObject*, QMetaObject::Call, int, void**) (this=0x556b9c2212c0, o=0x556b9c1f8f60, c=<optimized out>, id=<optimized out>, a=<optimized out>) at qml/qqmlopenmetaobject.cpp:307
#26 0x00007f19923592c2 in QQmlPropertyData::writeProperty(QObject*, void*, QFlags<QQmlPropertyData::WriteFlag>) const (this=this@entry=0x7ffe91ae7910, target=target@entry=0x556b9c1f8f60, value=value@entry=0x7ffe91ae7850, flags=...) at ../../include/QtQml/5.14.2/QtQml/private/../../../../../src/qml/qml/qqmlpropertydata_p.h:290
#27 0x00007f19923574c2 in QQmlPropertyPrivate::write(QObject*, QQmlPropertyData const&, QVariant const&, QQmlContextData*, QFlags<QQmlPropertyData::WriteFlag>) (object=0x556b9c1f8f60, property=..., value=..., context=0x556b9c252840, flags=...) at qml/qqmlproperty.cpp:1305
#28 0x00007f199228bc33 in QV4::QObjectWrapper::setProperty(QV4::ExecutionEngine*, QObject*, QQmlPropertyData*, QV4::Value const&) (engine=engine@entry=0x556b9ba3cf60, object=object@entry=0x556b9c1f8f60, property=0x7ffe91ae7910, value=...) at jsruntime/qv4qobjectwrapper.cpp:565
#29 0x00007f199228cb4e in QV4::QObjectWrapper::setQmlProperty(QV4::ExecutionEngine*, QQmlContextData*, QObject*, QV4::String*, QV4::QObjectWrapper::RevisionMode, QV4::Value const&) (engine=0x556b9ba3cf60, qmlContext=<optimized out>, object=0x556b9c1f8f60, name=<optimized out>, revisionMode=QV4::QObjectWrapper::IgnoreRevision, value=...) at jsruntime/qv4qobjectwrapper.cpp:435
#30 0x00007f199228cc9b in QV4::QObjectWrapper::virtualPut(QV4::Managed*, QV4::PropertyKey, QV4::Value const&, QV4::Value*) (m=0x7f197834b570, id=..., value=..., receiver=0x7f197834b570) at jsruntime/qv4qobjectwrapper.cpp:721
#31 0x00007f199220daa8 in QV4::Object::put(QV4::StringOrSymbol*, QV4::Value const&, QV4::Value*) (receiver=0x7f197834b570, v=..., name=0x7f197834b578, this=0x7f197834b578) at jsruntime/qv4object_p.h:318
#32 0x00007f199220daa8 in QV4::Lookup::setterFallback(QV4::Lookup*, QV4::ExecutionEngine*, QV4::Value&, QV4::Value const&) (l=<optimized out>, engine=0x556b9ba3cf60, object=..., value=...) at jsruntime/qv4lookup.cpp:497
#33 0x00007f19922a5978 in QV4::Moth::VME::interpret(QV4::CppStackFrame*, QV4::ExecutionEngine*, char const*) (frame=0x7ffe91ae7bf0, engine=0x556b9ba3cf60, code=0x7f197006925f "\016\002") at jsruntime/qv4vme_moth.cpp:653
#34 0x00007f19922aa686 in QV4::Moth::VME::exec(QV4::CppStackFrame*, QV4::ExecutionEngine*) (frame=frame@entry=0x7ffe91ae7bf0, engine=engine@entry=0x556b9ba3cf60) at jsruntime/qv4vme_moth.cpp:463
#35 0x00007f199223cfaa in QV4::Function::call(QV4::Value const*, QV4::Value const*, int, QV4::ExecutionContext const*) (this=this@entry=0x556b9c091180, thisObject=thisObject@entry=0x7f197834b4e8, argv=argv@entry=0x7f197834b500, argc=<optimized out>, context=<optimized out>) at jsruntime/qv4function.cpp:69
#36 0x00007f19923bae57 in QQmlJavaScriptExpression::evaluate(QV4::CallData*, bool*) (this=this@entry=0x556b9c283a10, callData=callData@entry=0x7f197834b4d0, isUndefined=isUndefined@entry=0x0) at qml/qqmljavascriptexpression.cpp:211
#37 0x00007f1992364f69 in QQmlBoundSignalExpression::evaluate(void**) (this=this@entry=0x556b9c283a10, a=a@entry=0x0) at qml/qqmlboundsignal.cpp:223
#38 0x00007f19923661bb in QQmlBoundSignal_callback(QQmlNotifierEndpoint*, void**) (e=0x556b9c283940, a=0x0) at qml/qqmlboundsignal.cpp:356
#39 0x00007f199239b322 in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) (endpoint=<optimized out>, a=a@entry=0x0) at qml/qqmlnotifier.cpp:104
#40 0x00007f1992349119 in QQmlData::signalEmitted(QAbstractDeclarativeData*, QObject*, int, void**) (object=0x556b9c25dcd0, index=<optimized out>, a=0x0) at qml/qqmlengine.cpp:858
#41 0x00007f198ea72314 in doActivate<false>(QObject*, int, void**) (sender=0x556b9c25dcd0, signal_index=43, argv=argv@entry=0x0) at kernel/qobject.cpp:3762
#42 0x00007f198ea6d169 in QMetaObject::activate(QObject*, int, int, void**) (sender=<optimized out>, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=argv@entry=0x0) at kernel/qobject.cpp:3943
#43 0x00007f1992342fe5 in QQmlVMEMetaObject::activate(QObject*, int, void**) (this=<optimized out>, object=<optimized out>, index=<optimized out>, args=args@entry=0x0) at qml/qqmlvmemetaobject.cpp:1212
#44 0x00007f1992343188 in QQmlVMEMetaObjectEndpoint::tryConnect() (this=0x556b9c073e90) at qml/qqmlvmemetaobject.cpp:155
#45 0x00007f199239b322 in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) (endpoint=<optimized out>, a=a@entry=0x0) at qml/qqmlnotifier.cpp:104
#46 0x00007f1992349119 in QQmlData::signalEmitted(QAbstractDeclarativeData*, QObject*, int, void**) (object=0x556b9c2816e0, index=<optimized out>, a=0x0) at qml/qqmlengine.cpp:858
#47 0x00007f198ea72314 in doActivate<false>(QObject*, int, void**) (sender=0x556b9c2816e0, signal_index=29, argv=0x0) at kernel/qobject.cpp:3762
#48 0x00007f198ea6cf92 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) (sender=sender@entry=0x556b9c2816e0, m=m@entry=0x7f1961133840 <Positioner::staticMetaObject>, local_signal_index=local_signal_index@entry=3, argv=argv@entry=0x0) at kernel/qobject.cpp:3930
#49 0x00007f1960f1ac43 in Positioner::positionsChanged() const (this=this@entry=0x556b9c2816e0) at ./obj-x86_64-linux-gnu/containments/desktop/plugins/folder/folderplugin_autogen/EWIEGA46WW/moc_positioner.cpp:394
#50 0x00007f1960f09cf3 in Positioner::updatePositions() (this=0x556b9c2816e0) at ./containments/desktop/plugins/folder/positioner.cpp:485
#51 0x00007f198ea726d7 in QtPrivate::QSlotObjectBase::call(QObject*, void**) (a=0x7ffe91aeb570, r=0x556b9c2816e0, this=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:398
#52 0x00007f198ea726d7 in doActivate<false>(QObject*, int, void**) (sender=0x556b9c25fcb0, signal_index=3, argv=0x7ffe91aeb570) at kernel/qobject.cpp:3870
#53 0x00007f198ea6cf92 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) (sender=sender@entry=0x556b9c25fcb0, m=m@entry=0x7f198ef05ce0 <QTimer::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7ffe91aeb570) at kernel/qobject.cpp:3930
#54 0x00007f198ea76297 in QTimer::timeout(QTimer::QPrivateSignal) (this=this@entry=0x556b9c25fcb0, _t1=...) at .moc/moc_qtimer.cpp:205
#55 0x00007f198ea765f8 in QTimer::timerEvent(QTimerEvent*) (this=0x556b9c25fcb0, e=<optimized out>) at kernel/qtimer.cpp:257
#56 0x00007f198ea6a4e3 in QObject::event(QEvent*) (this=0x556b9c25fcb0, e=0x7ffe91aeb8d0) at kernel/qobject.cpp:1361
#57 0x00007f198fd7b9ac in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=this@entry=0x556b9b911ed0, receiver=receiver@entry=0x556b9c25fcb0, e=e@entry=0x7ffe91aeb8d0) at kernel/qapplication.cpp:3685
#58 0x00007f198fd82bb0 in QApplication::notify(QObject*, QEvent*) (this=0x7ffe91aebc70, receiver=0x556b9c25fcb0, e=0x7ffe91aeb8d0) at kernel/qapplication.cpp:3431
#59 0x00007f198ea374a8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=0x556b9c25fcb0, event=0x7ffe91aeb8d0) at kernel/qcoreapplication.cpp:1075
#60 0x00007f198ea95c39 in QTimerInfoList::activateTimers() (this=0x556b9b97da80) at kernel/qtimerinfo_unix.cpp:643
#61 0x00007f198ea96401 in timerSourceDispatch(GSource*, GSourceFunc, gpointer) (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:183
#62 0x00007f1987ef4417 in g_main_context_dispatch () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#63 0x00007f1987ef4650 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#64 0x00007f1987ef46dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#65 0x00007f198ea967ac in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x556b9b98dfd0, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#66 0x00007f198ea35d2a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7ffe91aebb20, flags=..., flags@entry=...) at kernel/qeventloop.cpp:225
#67 0x00007f198ea3f4a0 in QCoreApplication::exec() () at kernel/qcoreapplication.cpp:1383
#68 0x0000556b9a692894 in main(int, char**) (argc=<optimized out>, argv=<optimized out>) at ./shell/main.cpp:228

Possible duplicates by query: bug 416260, bug 415114, bug 400450, bug 394984, bug 392350.

Reported using DrKonqi