Application: plasma-desktop (0.4)
KDE Platform Version: 4.7.3 (4.7.3)
Qt Version: 4.8.0
Operating System: Linux 3.1.1-1.fc16.x86_64 x86_64
Distribution (Platform): Fedora RPMs

-- Information about the crash:
- What I was doing when the application crashed:
i was switching desktop, then plasma crashed
this happened only once on my installation which is only about 2 hours old

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
82	T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
[KCrash Handler]
#6  isNull (this=0x0) at /usr/include/QtCore/qsharedpointer_impl.h:580
#7  operator! (this=0x0) at /usr/include/QtCore/qsharedpointer_impl.h:586
#8  TaskManager::TaskItem::task (this=0x17c7f10) at /usr/src/debug/kde-workspace-4.7.3/libs/taskmanager/taskitem.cpp:113
#9  0x00007f93efdb0218 in WindowTaskItem::publishIconGeometry (this=0x24e6540, rect=...) at /usr/src/debug/kde-workspace-4.7.3/plasma/desktop/applets/tasks/windowtaskitem.cpp:130
#10 0x00007f93efdbfd64 in TaskGroupItem::publishIconGeometry (this=<optimized out>, rect=...) at /usr/src/debug/kde-workspace-4.7.3/plasma/desktop/applets/tasks/taskgroupitem.cpp:1432
#11 0x00007f93efdbfb75 in publishIconGeometry (this=0x23910f0) at /usr/src/debug/kde-workspace-4.7.3/plasma/desktop/applets/tasks/taskgroupitem.cpp:1424
#12 TaskGroupItem::publishIconGeometry (this=0x23910f0) at /usr/src/debug/kde-workspace-4.7.3/plasma/desktop/applets/tasks/taskgroupitem.cpp:1416
#13 0x00007f93efdbebbc in AbstractTaskItem::timerEvent (this=0x23910f0, event=<optimized out>) at /usr/src/debug/kde-workspace-4.7.3/plasma/desktop/applets/tasks/abstracttaskitem.cpp:439
#14 0x00007f940db56719 in QObject::event (this=0x23910f0, e=<optimized out>) at kernel/qobject.cpp:1156
#15 0x00007f940d2ebf1b in QGraphicsWidget::event (this=0x23910f0, event=0x7fff4b71ca10) at graphicsview/qgraphicswidget.cpp:1461
#16 0x00007f940ccbb6f4 in notify_helper (e=0x7fff4b71ca10, receiver=0x23910f0, this=0xb59320) at kernel/qapplication.cpp:4518
#17 QApplicationPrivate::notify_helper (this=0xb59320, receiver=0x23910f0, e=0x7fff4b71ca10) at kernel/qapplication.cpp:4490
#18 0x00007f940ccc0573 in QApplication::notify (this=0xb66420, receiver=0x23910f0, e=0x7fff4b71ca10) at kernel/qapplication.cpp:4379
#19 0x00007f940ea96396 in KApplication::notify (this=0xb66420, receiver=0x23910f0, event=0x7fff4b71ca10) at /usr/src/debug/kdelibs-4.7.3/kdeui/kernel/kapplication.cpp:311
#20 0x00007f940db3db4c in QCoreApplication::notifyInternal (this=0xb66420, receiver=0x23910f0, event=0x7fff4b71ca10) at kernel/qcoreapplication.cpp:876
#21 0x00007f940db6e622 in sendEvent (event=0x7fff4b71ca10, receiver=<optimized out>) at kernel/qcoreapplication.h:231
#22 QTimerInfoList::activateTimers (this=0xb6ea50) at kernel/qeventdispatcher_unix.cpp:611
#23 0x00007f940db6bffd in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:186
#24 timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:180
#25 0x00007f940db6c021 in idleTimerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:233
#26 0x00007f940478ca7d in g_main_dispatch (context=0xb6e400) at gmain.c:2425
#27 g_main_context_dispatch (context=0xb6e400) at gmain.c:2995
#28 0x00007f940478d278 in g_main_context_iterate (context=0xb6e400, block=<optimized out>, dispatch=1, self=<optimized out>) at gmain.c:3073
#29 0x00007f940478d44c in g_main_context_iteration (context=0xb6e400, may_block=1) at gmain.c:3136
#30 0x00007f940db6c82f in QEventDispatcherGlib::processEvents (this=0xb00c00, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#31 0x00007f940cd5e43e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:207
#32 0x00007f940db3cc82 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#33 0x00007f940db3ced7 in QEventLoop::exec (this=0x7fff4b71ccb0, flags=...) at kernel/qeventloop.cpp:204
#34 0x00007f940db418d5 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1148
#35 0x00007f9413370243 in kdemain (argc=1, argv=0x7fff4b71d098) at /usr/src/debug/kde-workspace-4.7.3/plasma/desktop/shell/main.cpp:120
#36 0x00007f940bfbe69d in __libc_start_main (main=0x400850 <main(int, char**)>, argc=1, ubp_av=0x7fff4b71d098, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff4b71d088) at libc-start.c:226
#37 0x0000000000400881 in _start ()

Possible duplicates by query: bug 286669, bug 286629, bug 286616, bug 286582, bug 286514.

Reported using DrKonqi