Application: plasma-desktop (0.3)
KDE Platform Version: 4.3.90 (KDE 4.3.90 (KDE 4.4 RC1))
Qt Version: 4.6.0
Operating System: Linux 2.6.31-14-generic x86_64
Distribution: Ubuntu 9.10

-- Information about the crash:
It will crash the entire desktop everytime I select one of several grouped application windows out of task manager. If I click on a single app that isn't grouped, it's fine. 

The crash can be reproduced some of the time.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
The current source language is "auto; currently c".
[Current thread is 1 (Thread 0x7f09b68c8750 (LWP 8142))]

Thread 3 (Thread 0x7f098e92c910 (LWP 8151)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f09b4db467b in QWaitConditionPrivate::wait (this=<value optimized out>, mutex=0x15f8de8, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  QWaitCondition::wait (this=<value optimized out>, mutex=0x15f8de8, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:159
#3  0x00007f09b35703ec in QHostInfoAgent::run (this=0x15f8dd0) at kernel/qhostinfo.cpp:252
#4  0x00007f09b4db36c5 in QThreadPrivate::start (arg=0x15f8dd0) at thread/qthread_unix.cpp:244
#5  0x00007f09b4b24a04 in start_thread (arg=<value optimized out>) at pthread_create.c:300
#6  0x00007f09b38ef7bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f098df12910 (LWP 8152)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f09ac9d1556 in ?? () from /usr/lib/libQtWebKit.so.4
#2  0x00007f09ac9d1599 in ?? () from /usr/lib/libQtWebKit.so.4
#3  0x00007f09b4b24a04 in start_thread (arg=<value optimized out>) at pthread_create.c:300
#4  0x00007f09b38ef7bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()
The current source language is "auto; currently asm".

Thread 1 (Thread 0x7f09b68c8750 (LWP 8142)):
[KCrash Handler]
#5  QGraphicsScenePrivate::processDirtyItemsRecursive (this=0xd9f990, item=0x2ee9770, dirtyAncestorContainsChildren=false, parentOpacity=0) at graphicsview/qgraphicsscene.cpp:4895
#6  0x00007f09b466f31d in QGraphicsScenePrivate::_q_processDirtyItems (this=0xd9f990) at graphicsview/qgraphicsscene.cpp:466
#7  0x00007f09b466f962 in QGraphicsScene::qt_metacall (this=0xe59f30, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x3237070) at .moc/release-shared/moc_qgraphicsscene.cpp:130
#8  0x00007f09add2ed75 in Plasma::Corona::qt_metacall (this=0xd9f990, _c=49190768, _id=0, _a=0x0) at ./corona.moc:107
#9  0x00007f09a9826833 in ?? () from /usr/lib/libkdeinit4_plasma-desktop.so
#10 0x00007f09b4eb6d19 in QObject::event (this=0xe59f30, e=0x31f32d0) at kernel/qobject.cpp:1260
#11 0x00007f09b466b970 in QGraphicsScene::event (this=0xe59f30, event=0x31f32d0) at graphicsview/qgraphicsscene.cpp:3450
#12 0x00007f09b404ce8c in QApplicationPrivate::notify_helper (this=0xcdb210, receiver=0xe59f30, e=0x31f32d0) at kernel/qapplication.cpp:4242
#13 0x00007f09b405348d in QApplication::notify (this=0xcc4060, receiver=0xe59f30, e=0x31f32d0) at kernel/qapplication.cpp:4125
#14 0x00007f09b53ebe16 in KApplication::notify (this=0xcc4060, receiver=0xe59f30, event=0x31f32d0) at ../../kdeui/kernel/kapplication.cpp:302
#15 0x00007f09b4ea704c in QCoreApplication::notifyInternal (this=0xcc4060, receiver=0xe59f30, event=0x31f32d0) at kernel/qcoreapplication.cpp:704
#16 0x00007f09b4ea97c7 in QCoreApplication::sendEvent (receiver=0x0, event_type=<value optimized out>, data=0xc3c1e0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#17 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=<value optimized out>, data=0xc3c1e0) at kernel/qcoreapplication.cpp:1345
#18 0x00007f09b4ed0ae3 in QCoreApplication::sendPostedEvents (s=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:220
#19 postEventSourceDispatch (s=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:276
#20 0x00007f09b04ecbce in g_main_dispatch (context=0xcdd920) at /build/buildd/glib2.0-2.22.3/glib/gmain.c:1960
#21 IA__g_main_context_dispatch (context=0xcdd920) at /build/buildd/glib2.0-2.22.3/glib/gmain.c:2513
#22 0x00007f09b04f0598 in g_main_context_iterate (context=0xcdd920, block=<value optimized out>, dispatch=<value optimized out>, self=<value optimized out>)
    at /build/buildd/glib2.0-2.22.3/glib/gmain.c:2591
#23 0x00007f09b04f06c0 in IA__g_main_context_iteration (context=0xcdd920, may_block=1) at /build/buildd/glib2.0-2.22.3/glib/gmain.c:2654
#24 0x00007f09b4ed0623 in QEventDispatcherGlib::processEvents (this=0xcdac50, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:407
#25 0x00007f09b40fb2fe in QGuiEventDispatcherGlib::processEvents (this=0xd9f990, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#26 0x00007f09b4ea5972 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#27 0x00007f09b4ea5d4c in QEventLoop::exec (this=0x7fffbcbece20, flags=) at kernel/qeventloop.cpp:201
#28 0x00007f09b4ea9a8b in QCoreApplication::exec () at kernel/qcoreapplication.cpp:981
#29 0x00007f09a982d8a2 in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#30 0x0000000000406fb8 in launch (argc=1, _name=<value optimized out>, args=<value optimized out>, cwd=<value optimized out>, envc=0, envs=<value optimized out>, reset_env=false, tty=0x0, 
    avoid_loops=false, startup_id_str=0x40a4a1 "0") at ../../kinit/kinit.cpp:706
#31 0x0000000000407c70 in handle_launcher_request (sock=8, who=<value optimized out>) at ../../kinit/kinit.cpp:1198
#32 0x0000000000408121 in handle_requests (waitForPid=0) at ../../kinit/kinit.cpp:1391
#33 0x0000000000408dea in main (argc=4, argv=<value optimized out>, envp=<value optimized out>) at ../../kinit/kinit.cpp:1830
The current source language is "auto; currently c".

Reported using DrKonqi