Bug 309177

Application: plasma-desktop (0.4)
KDE Platform Version: 4.8.5 (4.8.5)
Qt Version: 4.8.1
Operating System: Linux 3.2.0-32-generic-pae i686
Distribution: Ubuntu 12.04.1 LTS

-- Information about the crash:
- What I was doing when the application crashed
Let me start from the beganing. I changed the desktop effects setting a little; just changed the desktop switcher from slide to cube. And my computer became slower than a snail. All applications and specially the panel. the KDE KickOff application launcher was too slow to open and close. So I tried to make another panel and remove the previous one. This is when the plasma desktop disappeared for a moment and then reappeared. but almost everything is fine except that my computer is dead slow.
I just installed Kubuntu few days ago. And I don't know much where to get help. I don't want to installed Kubuntu and all the apps from the scratch.. Please do help me with this. It's so annoying.
- Custom settings of the application:

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0xb1aa1740 (LWP 1738))]

Thread 5 (Thread 0xa99e1b40 (LWP 1740)):
#0  0xb2b988a6 in g_main_context_prepare () from /lib/i386-linux-gnu/libglib-2.0.so.0
#1  0xb2b98faf in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#2  0xb2b99201 in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#3  0xb643c8e7 in QEventDispatcherGlib::processEvents (this=0xa9000468, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#4  0xb640850d in QEventLoop::processEvents (this=0xa99e1240, flags=...) at kernel/qeventloop.cpp:149
#5  0xb64087a9 in QEventLoop::exec (this=0xa99e1240, flags=...) at kernel/qeventloop.cpp:204
#6  0xb62f194c in QThread::exec (this=0x88cc548) at thread/qthread.cpp:501
#7  0xb63e5b5d in QInotifyFileSystemWatcherEngine::run (this=0x88cc548) at io/qfilesystemwatcher_inotify.cpp:248
#8  0xb62f4de0 in QThreadPrivate::start (arg=0x88cc548) at thread/qthread_unix.cpp:298
#9  0xb2ca9d4c in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#10 0xb7622f4e in clone () from /lib/i386-linux-gnu/libc.so.6

Thread 4 (Thread 0xa8b7fb40 (LWP 1741)):
#0  0xb7776424 in __kernel_vsyscall ()
#1  0xb76125fb in read () from /lib/i386-linux-gnu/libc.so.6
#2  0xb2bd76ae in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#3  0xb2b98bd2 in g_main_context_check () from /lib/i386-linux-gnu/libglib-2.0.so.0
#4  0xb2b99042 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#5  0xb2b99201 in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#6  0xb643c8e7 in QEventDispatcherGlib::processEvents (this=0xa8200468, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#7  0xb640850d in QEventLoop::processEvents (this=0xa8b7f240, flags=...) at kernel/qeventloop.cpp:149
#8  0xb64087a9 in QEventLoop::exec (this=0xa8b7f240, flags=...) at kernel/qeventloop.cpp:204
#9  0xb62f194c in QThread::exec (this=0x88bc068) at thread/qthread.cpp:501
#10 0xb63e5b5d in QInotifyFileSystemWatcherEngine::run (this=0x88bc068) at io/qfilesystemwatcher_inotify.cpp:248
#11 0xb62f4de0 in QThreadPrivate::start (arg=0x88bc068) at thread/qthread_unix.cpp:298
#12 0xb2ca9d4c in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#13 0xb7622f4e in clone () from /lib/i386-linux-gnu/libc.so.6

Thread 3 (Thread 0xa811bb40 (LWP 1742)):
#0  0xb7776424 in __kernel_vsyscall ()
#1  0xb2cad96b in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/i386-linux-gnu/libpthread.so.0
#2  0xb763085c in pthread_cond_wait () from /lib/i386-linux-gnu/libc.so.6
#3  0xb3c6a029 in ?? () from /usr/lib/i386-linux-gnu/libQtScript.so.4
#4  0xb3c6a06f in ?? () from /usr/lib/i386-linux-gnu/libQtScript.so.4
#5  0xb2ca9d4c in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#6  0xb7622f4e in clone () from /lib/i386-linux-gnu/libc.so.6

Thread 2 (Thread 0xa6a26b40 (LWP 1744)):
#0  0xb7776424 in __kernel_vsyscall ()
#1  0xb76125fb in read () from /lib/i386-linux-gnu/libc.so.6
#2  0xb2bd76ae in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#3  0xb2b98bd2 in g_main_context_check () from /lib/i386-linux-gnu/libglib-2.0.so.0
#4  0xb2b99042 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#5  0xb2b9956b in g_main_loop_run () from /lib/i386-linux-gnu/libglib-2.0.so.0
#6  0xa73161ba in ?? () from /usr/lib/i386-linux-gnu/libgio-2.0.so.0
#7  0xb2bbc6b3 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#8  0xb2ca9d4c in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#9  0xb7622f4e in clone () from /lib/i386-linux-gnu/libc.so.6

Thread 1 (Thread 0xb1aa1740 (LWP 1738)):
[KCrash Handler]
#7  0x00000000 in ?? ()
#8  0xb6421fb0 in QObject::connect (sender=0x939b4a8, signal=0xaf1a9fa9 "2destroyed()", receiver=0x91d5168, method=0xaf1a9f98 "1widgetDeleted()", type=Qt::AutoConnection) at kernel/qobject.cpp:2551
#9  0xaf187dab in SystemTray::Task::widget (this=0x91d5168, host=0x9807628, createIfNecessary=true) at ../../../../../plasma/generic/applets/systemtray/core/task.cpp:83
#10 0xaf1a6709 in SystemTray::TaskArea::addWidgetForTask (this=0x9845680, task=0x91d5168) at ../../../../../plasma/generic/applets/systemtray/ui/taskarea.cpp:265
#11 0xaf1a6e9f in SystemTray::TaskArea::addTask (this=0x9845680, task=0x91d5168) at ../../../../../plasma/generic/applets/systemtray/ui/taskarea.cpp:196
#12 0xb64206b1 in QMetaObject::activate (sender=0x83bdf40, m=0xaf1b3ff8, local_signal_index=1, argv=0xbf9e96c8) at kernel/qobject.cpp:3547
#13 0xaf186e85 in SystemTray::Manager::taskChanged (this=0x83bdf40, _t1=0x91d5168) at ./manager.moc:120
#14 0xb64206b1 in QMetaObject::activate (sender=0x91d5168, m=0xaf1b40d0, local_signal_index=0, argv=0xbf9e97a8) at kernel/qobject.cpp:3547
#15 0xaf188465 in SystemTray::Task::changed (this=0x91d5168, _t1=0x91d5168) at ./task.moc:128
#16 0xaf1884b3 in SystemTray::Task::emitChanged (this=0x91d5168) at ../../../../../plasma/generic/applets/systemtray/core/task.cpp:144
#17 0xb641bc01 in QMetaCallEvent::placeMetaCall (this=0x9bbcc80, object=0x91d5168) at kernel/qobject.cpp:525
#18 0xb6424c7b in QObject::event (this=0x91d5168, e=0x9bbcc80) at kernel/qobject.cpp:1195
#19 0xb58f4ed4 in notify_helper (e=0x9bbcc80, receiver=0x91d5168, this=0x81b7550) at kernel/qapplication.cpp:4559
#20 QApplicationPrivate::notify_helper (this=0x81b7550, receiver=0x91d5168, e=0x9bbcc80) at kernel/qapplication.cpp:4531
#21 0xb58fa30d in QApplication::notify (this=0x9bbcc80, receiver=0x91d5168, e=0x9bbcc80) at kernel/qapplication.cpp:4288
#22 0xb6aa7e01 in KApplication::notify (this=0x81a6648, receiver=0x91d5168, event=0x9bbcc80) at ../../kdeui/kernel/kapplication.cpp:311
#23 0xb640997e in QCoreApplication::notifyInternal (this=0x81a6648, receiver=0x91d5168, event=0x9bbcc80) at kernel/qcoreapplication.cpp:876
#24 0xb640dad8 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#25 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x8169130) at kernel/qcoreapplication.cpp:1500
#26 0xb640de0c in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1393
#27 0xb643c494 in sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:236
#28 postEventSourceDispatch (s=0x81b8c80) at kernel/qeventdispatcher_glib.cpp:279
#29 0xb2b98d86 in g_main_context_dispatch () from /lib/i386-linux-gnu/libglib-2.0.so.0
#30 0xb2b99125 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#31 0xb2b99201 in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#32 0xb643c887 in QEventDispatcherGlib::processEvents (this=0x8169ea0, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#33 0xb59adaaa in QGuiEventDispatcherGlib::processEvents (this=0x8169ea0, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#34 0xb640850d in QEventLoop::processEvents (this=0xbf9e9f24, flags=...) at kernel/qeventloop.cpp:149
#35 0xb64087a9 in QEventLoop::exec (this=0xbf9e9f24, flags=...) at kernel/qeventloop.cpp:204
#36 0xb640deba in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1148
#37 0xb58f2a74 in QApplication::exec () at kernel/qapplication.cpp:3820
#38 0xb772aa7b in kdemain (argc=1, argv=0xbf9ea124) at ../../../../plasma/desktop/shell/main.cpp:120
#39 0x0804850b in main (argc=1, argv=0xbf9ea124) at plasma-desktop_dummy.cpp:3

Possible duplicates by query: bug 306586, bug 306117, bug 305012, bug 304637, bug 304060.

Reported using DrKonqi