Version:           unspecified (using KDE 4.7.2) 
OS:                Linux

I tried the following things:

- It does NOT crash when I use the terminal command "sudo shutdown -P now".
- It only crashes when I use the shutdown button ( http://www.freiwuppertal.de/plasmacrash1.png ).
- When it crashes, kcrash opens.
- As soon as I close kcrash, the shutdown continues normally.
- > I will create a video of it, please wait.

Reproducible: Always

Steps to Reproduce:
Use the shutdown button ( http://www.freiwuppertal.de/plasmacrash1.png ) to shut down your computer.

I always use Vidalia, TrueCrypt, ChatZilla, Thunderbird, FileZilla and Firefox. I close all of those programs before I shut down, so I do not think that this helps to reproduce it - but you could try it.

Actual Results:  
-> Details/Summary

Expected Results:  
-> Details/Summary

Kcrash file content:
--------------------
Application: Plasma-Desktop-Umgebung (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7faf16ef87c0 (LWP 3009))]

Thread 4 (Thread 0x7faef2c7d700 (LWP 3010)):
#0  0x00007faf1390e0a0 in qt_gettime () at tools/qelapsedtimer_unix.cpp:146
#1  0x00007faf139d06ed in QTimerInfoList::updateCurrentTime (this=0x2db79f0) at kernel/qeventdispatcher_unix.cpp:339
#2  0x00007faf139d0a33 in QTimerInfoList::timerWait (this=0x2db79f0, tm=...) at kernel/qeventdispatcher_unix.cpp:442
#3  0x00007faf139cf44c in timerSourcePrepareHelper (src=<optimized out>, timeout=0x7faef2c7cb3c) at kernel/qeventdispatcher_glib.cpp:136
#4  0x00007faf139cf4f5 in timerSourcePrepare (source=<optimized out>, timeout=<optimized out>) at kernel/qeventdispatcher_glib.cpp:169
#5  0x00007faf0ad67ff2 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007faf0ad68dfd in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#7  0x00007faf0ad69429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#8  0x00007faf139cff3e in QEventDispatcherGlib::processEvents (this=0x2d9ff00, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#9  0x00007faf139a3cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#10 0x00007faf139a3ef7 in QEventLoop::exec (this=0x7faef2c7ccd0, flags=...) at kernel/qeventloop.cpp:201
#11 0x00007faf138bb27f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#12 0x00007faf13986cbf in QInotifyFileSystemWatcherEngine::run (this=0x2db5930) at io/qfilesystemwatcher_inotify.cpp:248
#13 0x00007faf138bdd05 in QThreadPrivate::start (arg=0x2db5930) at thread/qthread_unix.cpp:331
#14 0x00007faf0808256c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#15 0x00007faf0b875efc in start_thread (arg=0x7faef2c7d700) at pthread_create.c:304
#16 0x00007faf167e989d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#17 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7faeebfff700 (LWP 3011)):
#0  0x00007faf167dd773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007faf0ad68f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007faf0ad69429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007faf139cff3e in QEventDispatcherGlib::processEvents (this=0x2f3dbd0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007faf139a3cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007faf139a3ef7 in QEventLoop::exec (this=0x7faeebffecd0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007faf138bb27f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007faf13986cbf in QInotifyFileSystemWatcherEngine::run (this=0x2921150) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007faf138bdd05 in QThreadPrivate::start (arg=0x2921150) at thread/qthread_unix.cpp:331
#9  0x00007faf0808256c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#10 0x00007faf0b875efc in start_thread (arg=0x7faeebfff700) at pthread_create.c:304
#11 0x00007faf167e989d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7faee8d92700 (LWP 3017)):
#0  0x00007faf167dd773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007faf0ad68f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007faf0ad69792 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007faee9870516 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007faf0ad8e2b6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007faf0808256c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#6  0x00007faf0b875efc in start_thread (arg=0x7faee8d92700) at pthread_create.c:304
#7  0x00007faf167e989d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#8  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7faf16ef87c0 (LWP 3009)):
[KCrash Handler]
#6  0x00000000027d6ae8 in ?? ()
#7  0x00007faefb938b96 in TaskGroupItem::~TaskGroupItem (this=0x55a10e0, __in_chrg=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:82
#8  0x00007faefb938c49 in TaskGroupItem::~TaskGroupItem (this=0x55a10e0, __in_chrg=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:83
#9  0x00007faf139bba88 in QObject::event (this=0x55a10e0, e=<optimized out>) at kernel/qobject.cpp:1200
#10 0x00007faf1337389b in QGraphicsWidget::event (this=0x55a10e0, event=0x4e44350) at graphicsview/qgraphicswidget.cpp:1455
#11 0x00007faf12d55424 in notify_helper (e=0x4e44350, receiver=0x55a10e0, this=0x25f3b10) at kernel/qapplication.cpp:4486
#12 QApplicationPrivate::notify_helper (this=0x25f3b10, receiver=0x55a10e0, e=0x4e44350) at kernel/qapplication.cpp:4458
#13 0x00007faf12d5a291 in QApplication::notify (this=0x25dbcf0, receiver=0x55a10e0, e=0x4e44350) at kernel/qapplication.cpp:4365
#14 0x00007faf14653126 in KApplication::notify (this=0x25dbcf0, receiver=0x55a10e0, event=0x4e44350) at ../../kdeui/kernel/kapplication.cpp:311
#15 0x00007faf139a4afc in QCoreApplication::notifyInternal (this=0x25dbcf0, receiver=0x55a10e0, event=0x4e44350) at kernel/qcoreapplication.cpp:787
#16 0x00007faf139a851f in sendEvent (event=0x4e44350, receiver=0x55a10e0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#17 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=52, data=0x2530430) at kernel/qcoreapplication.cpp:1428
#18 0x00007faf139a87c4 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1071
#19 0x00007faf16ae81a3 in kdemain (argc=1, argv=0x7fff76be6208) at ../../../../plasma/desktop/shell/main.cpp:120
#20 0x00007faf1672930d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fff76be6208, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff76be61f8) at libc-start.c:226
#21 0x0000000000400671 in _start ()