Application: plasma-desktop (0.4)
KDE Platform Version: 4.6.2 (4.6.2)
Qt Version: 4.7.2
Operating System: Linux 2.6.38-8-generic i686
Distribution: Ubuntu 11.04

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

I have a dual screen setup and everytime i login now, the default panel is missing. However I can bring up the run dialog box and launch a few applications. However, I never see the GUI. But if I create a new activity and stop the previous one, everything comes back to normal. I have the following plasmoids - system monitor, activity bar, weather forecast and Qalculate! It was during one of these 'attempt to restore desktop' that i got this error. This started happening recently only (maybe after some update.. not sure), the system was stable a few months back when 11.04 was launched.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0xb5fea720 (LWP 26672))]

Thread 4 (Thread 0xb3daab70 (LWP 26673)):
#0  0x01cea37a in g_main_context_query (context=0x9e83eb0, max_priority=2147483647, timeout=0xb3daa138, fds=0x9e86cc8, n_fds=2) at /build/buildd/glib2.0-2.28.6/./glib/gmain.c:2848
#1  0x01ceae8c in g_main_context_iterate (context=0x9e83eb0, block=1, dispatch=1, self=<value optimized out>) at /build/buildd/glib2.0-2.28.6/./glib/gmain.c:3073
#2  0x01ceb524 in g_main_context_iteration (context=0x9e83eb0, may_block=1) at /build/buildd/glib2.0-2.28.6/./glib/gmain.c:3154
#3  0x01531577 in QEventDispatcherGlib::processEvents (this=0x9e85120, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#4  0x01503289 in QEventLoop::processEvents (this=0xb3daa280, flags=...) at kernel/qeventloop.cpp:149
#5  0x01503522 in QEventLoop::exec (this=0xb3daa280, flags=...) at kernel/qeventloop.cpp:201
#6  0x0140d2a0 in QThread::exec (this=0x9e884a8) at thread/qthread.cpp:492
#7  0x014e4fdb in QInotifyFileSystemWatcherEngine::run (this=0x9e884a8) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x0140fda2 in QThreadPrivate::start (arg=0x9e884a8) at thread/qthread_unix.cpp:320
#9  0x082f2e99 in start_thread (arg=0xb3daab70) at pthread_create.c:304
#10 0x001f973e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 3 (Thread 0xacd6cb70 (LWP 26675)):
#0  __libc_disable_asynccancel (oldtype=<value optimized out>) at ../nptl/cancellation.c:83
#1  0x001eaf88 in __poll (fds=0xb343fa60, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:89
#2  0x01cfb84b in g_poll (fds=0xb343fa60, nfds=1, timeout=-1) at /build/buildd/glib2.0-2.28.6/./glib/gpoll.c:132
#3  0x01ceb1af in g_main_context_poll (context=0xb3416a28, block=30390304, dispatch=1, self=<value optimized out>) at /build/buildd/glib2.0-2.28.6/./glib/gmain.c:3404
#4  g_main_context_iterate (context=0xb3416a28, block=30390304, dispatch=1, self=<value optimized out>) at /build/buildd/glib2.0-2.28.6/./glib/gmain.c:3086
#5  0x01ceb524 in g_main_context_iteration (context=0xb3416a28, may_block=1) at /build/buildd/glib2.0-2.28.6/./glib/gmain.c:3154
#6  0x01531577 in QEventDispatcherGlib::processEvents (this=0xb3406160, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#7  0x01503289 in QEventLoop::processEvents (this=0xacd6c280, flags=...) at kernel/qeventloop.cpp:149
#8  0x01503522 in QEventLoop::exec (this=0xacd6c280, flags=...) at kernel/qeventloop.cpp:201
#9  0x0140d2a0 in QThread::exec (this=0x9e964f8) at thread/qthread.cpp:492
#10 0x014e4fdb in QInotifyFileSystemWatcherEngine::run (this=0x9e964f8) at io/qfilesystemwatcher_inotify.cpp:248
#11 0x0140fda2 in QThreadPrivate::start (arg=0x9e964f8) at thread/qthread_unix.cpp:320
#12 0x082f2e99 in start_thread (arg=0xacd6cb70) at pthread_create.c:304
#13 0x001f973e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 2 (Thread 0xabaecb70 (LWP 27077)):
#0  0x00cb5416 in __kernel_vsyscall ()
#1  0x082f7834 in pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/pthread_cond_timedwait.S:236
#2  0x00207454 in __pthread_cond_timedwait (cond=0xa5b6918, mutex=0xa5b6900, abstime=0xabaec290) at forward.c:152
#3  0x014103e5 in wait (this=0xa5ad52c, mutex=0xa5ad528, time=30000) at thread/qwaitcondition_unix.cpp:86
#4  QWaitCondition::wait (this=0xa5ad52c, mutex=0xa5ad528, time=30000) at thread/qwaitcondition_unix.cpp:160
#5  0x014038f1 in QThreadPoolThread::run (this=0xa4173c8) at concurrent/qthreadpool.cpp:140
#6  0x0140fda2 in QThreadPrivate::start (arg=0xa4173c8) at thread/qthread_unix.cpp:320
#7  0x082f2e99 in start_thread (arg=0xabaecb70) at pthread_create.c:304
#8  0x001f973e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 1 (Thread 0xb5fea720 (LWP 26672)):
[KCrash Handler]
#7  QGraphicsScene::removeItem (this=0x0, item=0xa4b8ce0) at .moc/release-shared/moc_qgraphicsscene.cpp:200
#8  0x0075c65a in Plasma::TabBar::removeTab (this=0xa4b5708, index=0) at ../../plasma/widgets/tabbar.cpp:457
#9  0x02cd9be1 in ActivityBar::dataUpdated (this=0x9c0da80, source=..., data=...) at ../../../../../plasma/generic/applets/activitybar/activitybar.cpp:337
#10 0x02cdb014 in ActivityBar::qt_metacall (this=0x9c0da80, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0xbfdc28b4) at ./activitybar.moc:101
#11 0x0150a6ba in QMetaObject::metacall (object=0x9c0da80, cl=QMetaObject::InvokeMetaMethod, idx=70, argv=0xbfdc28b4) at kernel/qmetaobject.cpp:237
#12 0x0151a4ff in QMetaObject::activate (sender=0xa4a7c10, m=0x819b04, local_signal_index=0, argv=0xbfdc28b4) at kernel/qobject.cpp:3287
#13 0x00666e09 in Plasma::DataContainer::dataUpdated (this=0xa4a7c10, _t1=..., _t2=...) at ./datacontainer.moc:112
#14 0x00667833 in Plasma::DataContainer::checkForUpdate (this=0xa4a7c10) at ../../plasma/datacontainer.cpp:327
#15 0x0066ad31 in Plasma::DataEngine::timerEvent (this=0xa4a78f0, event=0xbfdc2e2c) at ../../plasma/dataengine.cpp:386
#16 0x01519214 in QObject::event (this=0xa4a78f0, e=0xbfdc2e2c) at kernel/qobject.cpp:1190
#17 0x040bdd24 in QApplicationPrivate::notify_helper (this=0x9a29ae8, receiver=0xa4a78f0, e=0xbfdc2e2c) at kernel/qapplication.cpp:4462
#18 0x040c28ce in QApplication::notify (this=0x9a20430, receiver=0xa4a78f0, e=0xbfdc2e2c) at kernel/qapplication.cpp:3862
#19 0x011b63ca in KApplication::notify (this=0x9a20430, receiver=0xa4a78f0, event=0xbfdc2e2c) at ../../kdeui/kernel/kapplication.cpp:311
#20 0x015040bb in QCoreApplication::notifyInternal (this=0x9a20430, receiver=0xa4a78f0, event=0xbfdc2e2c) at kernel/qcoreapplication.cpp:731
#21 0x015341e4 in sendEvent (this=0x9a2ca34) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#22 QTimerInfoList::activateTimers (this=0x9a2ca34) at kernel/qeventdispatcher_unix.cpp:604
#23 0x01530df4 in timerSourceDispatch (source=0x9a2ca00) at kernel/qeventdispatcher_glib.cpp:184
#24 0x01ceaaa8 in g_main_dispatch (context=0x9a2be70) at /build/buildd/glib2.0-2.28.6/./glib/gmain.c:2440
#25 g_main_context_dispatch (context=0x9a2be70) at /build/buildd/glib2.0-2.28.6/./glib/gmain.c:3013
#26 0x01ceb270 in g_main_context_iterate (context=0x9a2be70, block=30390304, dispatch=1, self=<value optimized out>) at /build/buildd/glib2.0-2.28.6/./glib/gmain.c:3091
#27 0x01ceb524 in g_main_context_iteration (context=0x9a2be70, may_block=1) at /build/buildd/glib2.0-2.28.6/./glib/gmain.c:3154
#28 0x0153153c in QEventDispatcherGlib::processEvents (this=0x99b3aa8, flags=...) at kernel/qeventdispatcher_glib.cpp:422
#29 0x04171775 in QGuiEventDispatcherGlib::processEvents (this=0x99b3aa8, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#30 0x01503289 in QEventLoop::processEvents (this=0xbfdc30c4, flags=...) at kernel/qeventloop.cpp:149
#31 0x01503522 in QEventLoop::exec (this=0xbfdc30c4, flags=...) at kernel/qeventloop.cpp:201
#32 0x01507ecc in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1008
#33 0x040bb8e7 in QApplication::exec () at kernel/qapplication.cpp:3736
#34 0x005235a5 in kdemain (argc=1, argv=0xbfdc32d4) at ../../../../plasma/desktop/shell/main.cpp:118
#35 0x080485cb in main (argc=1, argv=0xbfdc32d4) at plasma-desktop_dummy.cpp:3

This bug may be a duplicate of or related to bug 264888.

Possible duplicates by query: bug 264888.

Reported using DrKonqi