Application: plasma-desktop (0.4)
KDE Platform Version: 4.7.00 (4.7.0)
Qt Version: 4.7.2
Operating System: Linux 2.6.38-11-generic x86_64
Distribution: Ubuntu 11.04

-- Information about the crash:
- What I was doing when the application crashed:
When trying to shut down the computer via the K-Menu the Plasma Shell crashes with a segfault most of the times. With "most of the times" meaning about 90%. Thus it happens almost always but not quite. So far I haven't been able to figure out whether it depends on some sort of programs that have been run during the session or something like that.
It is a KDE 4.7.0 environment running on Kubuntu 11.04 (installed from the kubuntu-ppa).

The crash can be reproduced some of the time.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7fbb6d4867c0 (LWP 2049))]

Thread 4 (Thread 0x7fbb4a513700 (LWP 2050)):
#0  0xffffffffff60017b in ?? ()
#1  0x00007fbb4a5129e0 in ?? ()
#2  0x00007ffffffa37b2 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

Thread 3 (Thread 0x7fbb48d1e700 (LWP 2051)):
#0  0x00007fbb6cd7af03 in __poll (fds=<value optimized out>, nfds=<value optimized out>, timeout=<value optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007fbb617a7104 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fbb617a7639 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fbb69f97446 in QEventDispatcherGlib::processEvents (this=0x1f3e310, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007fbb69f6b882 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007fbb69f6babc in QEventLoop::exec (this=0x7fbb48d1dcd0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007fbb69e82924 in QThread::exec (this=<value optimized out>) at thread/qthread.cpp:492
#7  0x00007fbb69f4dc2f in QInotifyFileSystemWatcherEngine::run (this=0x1f3d8e0) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007fbb69e85175 in QThreadPrivate::start (arg=0x1f3d8e0) at thread/qthread_unix.cpp:320
#9  0x00007fbb5f82c853 in ?? () from /usr/lib/nvidia-current/libGL.so.1
#10 0x00007fbb622aed8c in start_thread (arg=0x7fbb48d1e700) at pthread_create.c:304
#11 0x00007fbb6cd8804d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fbb40158700 (LWP 2057)):
#0  0x00007fbb6cd7af03 in __poll (fds=<value optimized out>, nfds=<value optimized out>, timeout=<value optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007fbb617a7104 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fbb617a79f2 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fbb4126fc44 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007fbb617ce3e4 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fbb5f82c853 in ?? () from /usr/lib/nvidia-current/libGL.so.1
#6  0x00007fbb622aed8c in start_thread (arg=0x7fbb40158700) at pthread_create.c:304
#7  0x00007fbb6cd8804d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#8  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fbb6d4867c0 (LWP 2049)):
[KCrash Handler]
#6  0x00007fbb69df4970 in vtable for QGraphicsLayoutItem () from /usr/lib/libQtGui.so.4
#7  0x00007fbb533b3da4 in TaskGroupItem::~TaskGroupItem (this=0x1727370, __in_chrg=<value optimized out>) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:82
#8  0x00007fbb533b3e49 in TaskGroupItem::~TaskGroupItem (this=0x1727370, __in_chrg=<value optimized out>) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:83
#9  0x00007fbb69f804c8 in QObject::event (this=0x1727370, e=<value optimized out>) at kernel/qobject.cpp:1209
#10 0x00007fbb699511bb in QGraphicsWidget::event (this=0x1727370, event=0x2782800) at graphicsview/qgraphicswidget.cpp:1423
#11 0x00007fbb693299f4 in QApplicationPrivate::notify_helper (this=0x153bf70, receiver=0x1727370, e=0x2782800) at kernel/qapplication.cpp:4462
#12 0x00007fbb6932e3ba in QApplication::notify (this=<value optimized out>, receiver=0x1727370, e=0x2782800) at kernel/qapplication.cpp:4341
#13 0x00007fbb6ac0c796 in KApplication::notify (this=0x152df80, receiver=0x1727370, event=0x2782800) at ../../kdeui/kernel/kapplication.cpp:311
#14 0x00007fbb69f6c49c in QCoreApplication::notifyInternal (this=0x152df80, receiver=0x1727370, event=0x2782800) at kernel/qcoreapplication.cpp:731
#15 0x00007fbb69f6fc25 in sendEvent (receiver=0x0, event_type=52, data=0x1469b00) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#16 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=52, data=0x1469b00) at kernel/qcoreapplication.cpp:1372
#17 0x00007fbb69f6ff0e in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1015
#18 0x00007fbb6d0769dc in kdemain (argc=1, argv=0x7fffffe4caa8) at ../../../../plasma/desktop/shell/main.cpp:120
#19 0x00007fbb6ccc0eff in __libc_start_main (main=0x400740 <main(int, char**)>, argc=1, ubp_av=0x7fffffe4caa8, init=<value optimized out>, fini=<value optimized out>, rtld_fini=<value optimized out>, stack_end=0x7fffffe4ca98) at libc-start.c:226
#20 0x0000000000400669 in _start ()

Reported using DrKonqi