Application: plasma-desktop (0.4)
KDE Platform Version: 4.7.3 (4.7.3)
Qt Version: 4.7.4
Operating System: Linux 3.0.0-14-generic x86_64
Distribution: Ubuntu 11.10

-- Information about the crash:
- What I was doing when the application crashed: I had a minimised vlc paused and Amarok minimised to tray dolphin open and tried to check another video after trying to close the new VLC window the error message popped up.  Also Akregator and kmail were minimised in tray also.

The crash can be reproduced some of the time.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7fbc430fe7c0 (LWP 1804))]

Thread 4 (Thread 0x7fbc1e72c700 (LWP 1805)):
#0  0x00007fbc429d5773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007fbc36f5ff68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fbc36f60429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fbc3fbc6f3e in QEventDispatcherGlib::processEvents (this=0x2ed5670, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007fbc3fb9acf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007fbc3fb9aef7 in QEventLoop::exec (this=0x7fbc1e72bcd0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007fbc3fab227f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007fbc3fb7dcbf in QInotifyFileSystemWatcherEngine::run (this=0x2ed3fd0) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007fbc3fab4d05 in QThreadPrivate::start (arg=0x2ed3fd0) at thread/qthread_unix.cpp:331
#9  0x00007fbc3427956c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#10 0x00007fbc37a6cefc in start_thread (arg=0x7fbc1e72c700) at pthread_create.c:304
#11 0x00007fbc429e189d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7fbc1cf1d700 (LWP 1806)):
#0  0x00007fbc429d5773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007fbc36f5ff68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fbc36f60429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fbc3fbc6f3e in QEventDispatcherGlib::processEvents (this=0x30a6fe0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007fbc3fb9acf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007fbc3fb9aef7 in QEventLoop::exec (this=0x7fbc1cf1ccd0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007fbc3fab227f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007fbc3fb7dcbf in QInotifyFileSystemWatcherEngine::run (this=0x3081860) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007fbc3fab4d05 in QThreadPrivate::start (arg=0x3081860) at thread/qthread_unix.cpp:331
#9  0x00007fbc3427956c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#10 0x00007fbc37a6cefc in start_thread (arg=0x7fbc1cf1d700) at pthread_create.c:304
#11 0x00007fbc429e189d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fbc14bb5700 (LWP 1812)):
#0  0x00007fbc15606450 in g_cancellable_is_cancelled () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#1  0x00007fbc1563d927 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#2  0x00007fbc1563d9ce in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#3  0x00007fbc36f5f734 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fbc36f5ff82 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fbc36f60792 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007fbc15693516 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#7  0x00007fbc36f852b6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#8  0x00007fbc3427956c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#9  0x00007fbc37a6cefc in start_thread (arg=0x7fbc14bb5700) at pthread_create.c:304
#10 0x00007fbc429e189d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fbc430fe7c0 (LWP 1804)):
[KCrash Handler]
#6  isNull (this=0x2200000290) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:568
#7  operator! (this=0x2200000290) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:574
#8  TaskManager::TaskItem::task (this=0x386f020) at ../../../libs/taskmanager/taskitem.cpp:113
#9  0x00007fbc2682e068 in WindowTaskItem::publishIconGeometry (this=0x4ca61a0, rect=...) at ../../../../../plasma/desktop/applets/tasks/windowtaskitem.cpp:130
#10 0x00007fbc2683dd24 in TaskGroupItem::publishIconGeometry (this=<optimized out>, rect=...) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:1432
#11 0x00007fbc2683daa5 in publishIconGeometry (this=0x4654d10) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:1424
#12 TaskGroupItem::publishIconGeometry (this=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:1416
#13 0x00007fbc2683cb7c in AbstractTaskItem::timerEvent (this=0x4654d10, event=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/abstracttaskitem.cpp:439
#14 0x00007fbc3fbb2789 in QObject::event (this=0x4654d10, e=<optimized out>) at kernel/qobject.cpp:1181
#15 0x00007fbc3f56a89b in QGraphicsWidget::event (this=0x4654d10, event=0x7fffc38b1120) at graphicsview/qgraphicswidget.cpp:1455
#16 0x00007fbc3ef4c424 in notify_helper (e=0x7fffc38b1120, receiver=0x4654d10, this=0x26512a0) at kernel/qapplication.cpp:4486
#17 QApplicationPrivate::notify_helper (this=0x26512a0, receiver=0x4654d10, e=0x7fffc38b1120) at kernel/qapplication.cpp:4458
#18 0x00007fbc3ef51291 in QApplication::notify (this=0x2600560, receiver=0x4654d10, e=0x7fffc38b1120) at kernel/qapplication.cpp:4365
#19 0x00007fbc4084a126 in KApplication::notify (this=0x2600560, receiver=0x4654d10, event=0x7fffc38b1120) at ../../kdeui/kernel/kapplication.cpp:311
#20 0x00007fbc3fb9bafc in QCoreApplication::notifyInternal (this=0x2600560, receiver=0x4654d10, event=0x7fffc38b1120) at kernel/qcoreapplication.cpp:787
#21 0x00007fbc3fbc8d62 in sendEvent (event=0x7fffc38b1120, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#22 QTimerInfoList::activateTimers (this=0x26540f0) at kernel/qeventdispatcher_unix.cpp:603
#23 0x00007fbc3fbc6538 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#24 idleTimerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:231
#25 0x00007fbc36f5fa5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007fbc36f60258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007fbc36f60429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007fbc3fbc6ed6 in QEventDispatcherGlib::processEvents (this=0x258bf40, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#29 0x00007fbc3eff407e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#30 0x00007fbc3fb9acf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#31 0x00007fbc3fb9aef7 in QEventLoop::exec (this=0x7fffc38b13b0, flags=...) at kernel/qeventloop.cpp:201
#32 0x00007fbc3fb9f789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#33 0x00007fbc42ce01a3 in kdemain (argc=1, argv=0x7fffc38b1798) at ../../../../plasma/desktop/shell/main.cpp:120
#34 0x00007fbc4292130d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fffc38b1798, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffc38b1788) at libc-start.c:226
#35 0x0000000000400671 in _start ()

Possible duplicates by query: bug 290129, bug 290106, bug 290101, bug 290081, bug 290071.

Reported using DrKonqi