Application: plasmashell (5.5.4)

Qt Version: 5.5.1
Operating System: Linux 4.2.0-27-generic x86_64
Distribution: Ubuntu 15.10

-- Information about the crash:
- What I was doing when the application crashed:
I change to the previous activity using a custom global keyboard shortcut. 

- Custom settings of the application:
I used the Alt + Ctrl + Down Arrow as a shortcut to navigate to the previous activity. 

My shortcut to navigate to the next activity is Alt + Ctrl + Up Arrow and works as expected. The crash happens everey time. 

As a side note. I don't know if it is related to the reported problem but I just found out that I am not able to access the Activities module from System Settings

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 0x7f4c7fa3c800 (LWP 14040))]

Thread 7 (Thread 0x7f4c6af5c700 (LWP 14041)):
#0  0x00007f4c7a13e88d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f4c7e206bd2 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f4c7e20874f in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f4c6d0a5839 in QXcbEventReader::run (this=0x120f8e0) at qxcbconnection.cpp:1230
#4  0x00007f4c7a834a6e in QThreadPrivate::start (arg=0x120f8e0) at thread/qthread_unix.cpp:331
#5  0x00007f4c799206aa in start_thread (arg=0x7f4c6af5c700) at pthread_create.c:333
#6  0x00007f4c7a149e9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7f4c63fff700 (LWP 14043)):
#0  0x00007f4c76f19884 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f4c76ed4770 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f4c76ed511b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f4c76ed52fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f4c7aa6c50b in QEventDispatcherGlib::processEvents (this=0x7f4c5c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f4c7aa1350a in QEventLoop::exec (this=this@entry=0x7f4c63ffeda0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f4c7a82fac4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f4c7d0d7105 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f4c7a834a6e in QThreadPrivate::start (arg=0x12d6030) at thread/qthread_unix.cpp:331
#9  0x00007f4c799206aa in start_thread (arg=0x7f4c63fff700) at pthread_create.c:333
#10 0x00007f4c7a149e9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7f4c5914d700 (LWP 14047)):
#0  0x00007f4c7a13a44d in read () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f4c76f184e0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f4c76ed4cd4 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f4c76ed5190 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f4c76ed52fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f4c7aa6c50b in QEventDispatcherGlib::processEvents (this=0x7f4c540008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#6  0x00007f4c7aa1350a in QEventLoop::exec (this=this@entry=0x7f4c5914cda0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#7  0x00007f4c7a82fac4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#8  0x00007f4c7d0d7105 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007f4c7a834a6e in QThreadPrivate::start (arg=0x16afb70) at thread/qthread_unix.cpp:331
#10 0x00007f4c799206aa in start_thread (arg=0x7f4c5914d700) at pthread_create.c:333
#11 0x00007f4c7a149e9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f4c53864700 (LWP 14058)):
#0  QThreadData::current (createIfNecessary=createIfNecessary@entry=true) at thread/qthread_unix.cpp:213
#1  0x00007f4c7aa6ba6a in postEventSourcePrepare (s=0x7f4c4c0012d0, timeout=0x7f4c53863be4) at kernel/qeventdispatcher_glib.cpp:247
#2  0x00007f4c76ed477d in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f4c76ed511b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f4c76ed52fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f4c7aa6c50b in QEventDispatcherGlib::processEvents (this=0x7f4c4c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#6  0x00007f4c7aa1350a in QEventLoop::exec (this=this@entry=0x7f4c53863da0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#7  0x00007f4c7a82fac4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#8  0x00007f4c7d0d7105 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007f4c7a834a6e in QThreadPrivate::start (arg=0x16786b0) at thread/qthread_unix.cpp:331
#10 0x00007f4c799206aa in start_thread (arg=0x7f4c53864700) at pthread_create.c:333
#11 0x00007f4c7a149e9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f4c51f80700 (LWP 14064)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f4c7f491194 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007f4c7f4911d9 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007f4c799206aa in start_thread (arg=0x7f4c51f80700) at pthread_create.c:333
#4  0x00007f4c7a149e9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f4bcb069700 (LWP 14070)):
#0  0x00007f4c76ed47c1 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f4c76ed511b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f4c76ed52fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f4c7aa6c50b in QEventDispatcherGlib::processEvents (this=0x7f4bc40008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f4c7aa1350a in QEventLoop::exec (this=this@entry=0x7f4bcb068d50, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f4c7a82fac4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f4c7da61136 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f4c7a834a6e in QThreadPrivate::start (arg=0x1ab59e0) at thread/qthread_unix.cpp:331
#8  0x00007f4c799206aa in start_thread (arg=0x7f4bcb069700) at pthread_create.c:333
#9  0x00007f4c7a149e9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f4c7fa3c800 (LWP 14040)):
[KCrash Handler]
#6  QString::QString (other=<error reading variable: Cannot access memory at address 0x324d4d4d00000016>, this=this@entry=0x7fff65114810) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:877
#7  KActivities::Info::id (this=0x324d4d4d00000006) at ../../../src/lib/info.cpp:131
#8  0x00007f4c5126a751 in KActivitiesBackport::ActivitiesModel::data (this=<optimized out>, index=..., role=<optimized out>) at ../../../imports/activitymanager/backport/switcheractivitiesmodel.cpp:379
#9  0x00007f4c7a9dcba9 in QSortFilterProxyModel::data (this=this@entry=0x18caa20, index=..., role=role@entry=256) at itemmodels/qsortfilterproxymodel.cpp:1949
#10 0x00007f4c512696a2 in SortedActivitiesModel::data (this=this@entry=0x18caa20, index=..., role=role@entry=256) at ../../../imports/activitymanager/sortedactivitiesmodel.cpp:309
#11 0x00007f4c512677b4 in SortedActivitiesModel::activityIdForRow (this=this@entry=0x18caa20, row=row@entry=0) at ../../../imports/activitymanager/sortedactivitiesmodel.cpp:315
#12 0x00007f4c512679f9 in SortedActivitiesModel::relativeActivity (this=0x18caa20, relative=-1) at ../../../imports/activitymanager/sortedactivitiesmodel.cpp:347
#13 0x00007f4c51263180 in SwitcherBackend::switchToActivity (this=0x18e79c0, direction=<optimized out>) at ../../../imports/activitymanager/switcherbackend.cpp:212
#14 0x00007f4c7aa44777 in QtPrivate::QSlotObjectBase::call (a=0x7fff65114b70, r=0x18e79c0, this=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:124
#15 QMetaObject::activate (sender=sender@entry=0x18f1760, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x7fff65114b70) at kernel/qobject.cpp:3698
#16 0x00007f4c7aa450e7 in QMetaObject::activate (sender=sender@entry=0x18f1760, m=m@entry=0x7f4c7ba1dbc0 <QAction::staticMetaObject>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x7fff65114b70) at kernel/qobject.cpp:3578
#17 0x00007f4c7b510d92 in QAction::triggered (this=this@entry=0x18f1760, _t1=false) at .moc/moc_qaction.cpp:365
#18 0x00007f4c7b513218 in QAction::activate (this=0x18f1760, event=<optimized out>) at kernel/qaction.cpp:1162
#19 0x00007f4c7d2329bb in QAction::trigger (this=0x18f1760) at /usr/include/x86_64-linux-gnu/qt5/QtWidgets/qaction.h:177
#20 KGlobalAccelPrivate::_k_invokeAction (this=0x129eca0, componentUnique=..., actionUnique=..., timestamp=20735893) at ../../src/kglobalaccel.cpp:449
#21 0x00007f4c7aa448ea in QMetaObject::activate (sender=sender@entry=0x12c0150, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fff65114dd0) at kernel/qobject.cpp:3713
#22 0x00007f4c7aa450e7 in QMetaObject::activate (sender=sender@entry=0x12c0150, m=m@entry=0x7f4c7d448c60 <OrgKdeKglobalaccelComponentInterface::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fff65114dd0) at kernel/qobject.cpp:3578
#23 0x00007f4c7d241684 in OrgKdeKglobalaccelComponentInterface::globalShortcutPressed (_t3=20735893, _t2=..., _t1=..., this=0x12c0150) at kglobalaccel_component_interface.moc:220
#24 OrgKdeKglobalaccelComponentInterface::qt_static_metacall (_o=_o@entry=0x12c0150, _c=_c@entry=QMetaObject::InvokeMetaMethod, _id=_id@entry=0, _a=_a@entry=0x7fff65114f80) at kglobalaccel_component_interface.moc:118
#25 0x00007f4c7d241f90 in OrgKdeKglobalaccelComponentInterface::qt_metacall (this=0x12c0150, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0x7fff65114f80) at kglobalaccel_component_interface.moc:189
#26 0x00007f4c7fb81963 in QDBusConnectionPrivate::deliverCall (this=0x1249520, object=0x12c0150, msg=..., metaTypes=..., slotIdx=6) at qdbusintegrator.cpp:978
#27 0x00007f4c7aa457b1 in QObject::event (this=0x12c0150, e=<optimized out>) at kernel/qobject.cpp:1239
#28 0x00007f4c7b51a9dc in QApplicationPrivate::notify_helper (this=this@entry=0x11f8710, receiver=receiver@entry=0x12c0150, e=e@entry=0x57764b0) at kernel/qapplication.cpp:3716
#29 0x00007f4c7b51fea6 in QApplication::notify (this=0x7fff65115690, receiver=0x12c0150, e=0x57764b0) at kernel/qapplication.cpp:3499
#30 0x00007f4c7aa15d7b in QCoreApplication::notifyInternal (this=0x7fff65115690, receiver=0x12c0150, event=event@entry=0x57764b0) at kernel/qcoreapplication.cpp:965
#31 0x00007f4c7aa18176 in QCoreApplication::sendEvent (event=0x57764b0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:224
#32 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x11ee600) at kernel/qcoreapplication.cpp:1593
#33 0x00007f4c7aa18658 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1451
#34 0x00007f4c7aa6c0e3 in postEventSourceDispatch (s=0x1239060) at kernel/qeventdispatcher_glib.cpp:271
#35 0x00007f4c76ed4ff7 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#36 0x00007f4c76ed5250 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#37 0x00007f4c76ed52fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#38 0x00007f4c7aa6c4ef in QEventDispatcherGlib::processEvents (this=0x122e2b0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#39 0x00007f4c7aa1350a in QEventLoop::exec (this=this@entry=0x7fff65115540, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#40 0x00007f4c7aa1b5ec in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1229
#41 0x00007f4c7ad4fcec in QGuiApplication::exec () at kernel/qguiapplication.cpp:1527
#42 0x00007f4c7b516e15 in QApplication::exec () at kernel/qapplication.cpp:2976
#43 0x0000000000432423 in main (argc=2, argv=<optimized out>) at ../../shell/main.cpp:158

Reported using DrKonqi