Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.00 (KDE 4.3.0)
Qt Version: 4.5.2
Operating System: Linux 2.6.30-0.slh.5-sidux-amd64 x86_64
Distribution: Debian GNU/Linux unstable (sid)

What I was doing when the application crashed:
I tried to drag the notification from the system tray to the desktop. 
When it setteld there I sezized it becaus the butten broke out of its layout as it seemed.
then I minimized each of the items in it (File Downloads) and it  crashed.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f5c2aa4e750 (LWP 3741))]

Thread 2 (Thread 0x7f5c0821e950 (LWP 3744)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f5c2a5903e9 in QWaitConditionPrivate::wait (this=0x13e8490, mutex=0x13e8488, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  QWaitCondition::wait (this=0x13e8490, mutex=0x13e8488, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:159
#3  0x00007f5c26990fc4 in QHostInfoAgent::run (this=0x13e8470) at kernel/qhostinfo.cpp:260
#4  0x00007f5c2a58f3f5 in QThreadPrivate::start (arg=0x13e8470) at thread/qthread_unix.cpp:188
#5  0x00007f5c272d2f9a in start_thread (arg=<value optimized out>) at pthread_create.c:300
#6  0x00007f5c27e9956d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f5c2aa4e750 (LWP 3741)):
[KCrash Handler]
#5  0x00007f5c211aaa54 in Plasma::ExtenderItem::group (this=0x2514950) at ../../plasma/extenderitem.cpp:330
#6  0x00007f5c211a9268 in Plasma::ExtenderGroup::items (this=0x142a4b0) at ../../plasma/extendergroup.cpp:92
#7  0x00007f5c0ab3808f in SystemTray::ExtenderTaskBusyWidget::updateTask (this=0x1445550) at ../../../../plasma/applets/systemtray/core/extendertask.cpp:155
#8  0x00007f5c0ab38aa5 in SystemTray::ExtenderTaskBusyWidget::qt_metacall (this=0x1445550, _c=QMetaObject::InvokeMetaMethod, _id=64, _a=<value optimized out>) at ./extendertask.moc:69
#9  0x00007f5c2a68a602 in QMetaObject::activate (sender=0x10fad80, from_signal_index=<value optimized out>, to_signal_index=11, argv=0x3b65c20) at kernel/qobject.cpp:3112
#10 0x00007f5c0ab39162 in SystemTray::Manager::jobChanged (this=0x2514950, _t1=0x323a4d0) at ./manager.moc:174
#11 0x00007f5c0ab3a317 in SystemTray::Manager::qt_metacall (this=0x10fad80, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff142ecd40) at ./manager.moc:105
#12 0x00007f5c2a68a602 in QMetaObject::activate (sender=0x323a4d0, from_signal_index=<value optimized out>, to_signal_index=5, argv=0x3b65c20) at kernel/qobject.cpp:3112
#13 0x00007f5c0ab3c262 in SystemTray::Job::changed (this=0x2514950, _t1=0x323a4d0) at ./job.moc:102
#14 0x00007f5c2a684b73 in QObject::event (this=0x323a4d0, e=0x1419530) at kernel/qobject.cpp:1074
#15 0x00007f5c286037ad in QApplicationPrivate::notify_helper (this=0x94e970, receiver=0x323a4d0, e=0x7fff142ed3c0) at kernel/qapplication.cpp:4056
#16 0x00007f5c2860b80a in QApplication::notify (this=0x945810, receiver=0x323a4d0, e=0x7fff142ed3c0) at kernel/qapplication.cpp:4021
#17 0x00007f5c2925cb2b in KApplication::notify (this=0x945810, receiver=0x323a4d0, event=0x7fff142ed3c0) at ../../kdeui/kernel/kapplication.cpp:302
#18 0x00007f5c2a67549c in QCoreApplication::notifyInternal (this=0x945810, receiver=0x323a4d0, event=0x7fff142ed3c0) at kernel/qcoreapplication.cpp:610
#19 0x00007f5c2a6a17a6 in QCoreApplication::sendEvent (this=0x951f20) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#20 QTimerInfoList::activateTimers (this=0x951f20) at kernel/qeventdispatcher_unix.cpp:572
#21 0x00007f5c2a69dc1d in timerSourceDispatch (source=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:165
#22 0x00007f5c275207aa in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#23 0x00007f5c27523df8 in ?? () from /usr/lib/libglib-2.0.so.0
#24 0x00007f5c27523fac in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#25 0x00007f5c2a69db7f in QEventDispatcherGlib::processEvents (this=0x94e4a0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#26 0x00007f5c2869a5ef in QGuiEventDispatcherGlib::processEvents (this=0x2514950, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#27 0x00007f5c2a673d62 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#28 0x00007f5c2a674134 in QEventLoop::exec (this=0x7fff142ed670, flags=...) at kernel/qeventloop.cpp:201
#29 0x00007f5c2a6763a4 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#30 0x00007f5c1e6f81bb in kdemain (argc=1, argv=0x8d7260) at ../../../../plasma/shells/desktop/main.cpp:50
#31 0x0000000000407264 in launch (argc=1, _name=0x8fbb98 "/usr/bin/plasma-desktop", args=<value optimized out>, cwd=0x0, envc=0, envs=0x8fbbb8 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x40a0ff "0") at ../../kinit/kinit.cpp:676
#32 0x0000000000407a28 in handle_launcher_request (sock=7, who=<value optimized out>) at ../../kinit/kinit.cpp:1168
#33 0x0000000000407fae in handle_requests (waitForPid=0) at ../../kinit/kinit.cpp:1361
#34 0x000000000040863b in main (argc=2, argv=0x7fff142ee4e8, envp=0x7fff142ee500) at ../../kinit/kinit.cpp:1788

Reported using DrKonqi