Application: plasma-desktop (0.4)
KDE Platform Version: 4.7.2 (4.7.2)
Qt Version: 4.7.4
Operating System: Linux 3.0.0-12-generic-pae i686
Distribution: Ubuntu 11.10

-- Information about the crash:
- What I was doing when the application crashed:
Close Dolphin, then performed Shutdown. No apps open on taskbar.
This happens more times than not when shutting down.
Sometimes buttons remain for a while on taskbar after closing them, this may be related.

The crash can be reproduced some of the time.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0xb1f83b20 (LWP 1856))]

Thread 4 (Thread 0xab38db70 (LWP 1857)):
#0  0xb780e424 in __kernel_vsyscall ()
#1  0xb76ba40e in poll () from /lib/i386-linux-gnu/libc.so.6
#2  0xb2fae34b in g_poll () from /lib/i386-linux-gnu/libglib-2.0.so.0
#3  0xb2f9f896 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#4  0xb2f9fc2a in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#5  0xb6516b37 in QEventDispatcherGlib::processEvents (this=0x88bcd20, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#6  0xb64e71dd in QEventLoop::processEvents (this=0xab38d2a0, flags=...) at kernel/qeventloop.cpp:149
#7  0xb64e7421 in QEventLoop::exec (this=0xab38d2a0, flags=...) at kernel/qeventloop.cpp:201
#8  0xb63ea90b in QThread::exec (this=0x88bc338) at thread/qthread.cpp:498
#9  0xb64c7e2d in QInotifyFileSystemWatcherEngine::run (this=0x88bc338) at io/qfilesystemwatcher_inotify.cpp:248
#10 0xb63ed7b3 in QThreadPrivate::start (arg=0x88bc338) at thread/qthread_unix.cpp:331
#11 0xb30b9d31 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#12 0xb76c90ce in clone () from /lib/i386-linux-gnu/libc.so.6
Backtrace stopped: Not enough registers or memory available to unwind further

Thread 3 (Thread 0xa98c6b70 (LWP 1858)):
#0  0xb30bcd29 in __pthread_mutex_unlock_usercnt () from /lib/i386-linux-gnu/libpthread.so.0
#1  0xb76d6f54 in pthread_mutex_unlock () from /lib/i386-linux-gnu/libc.so.6
#2  0xb2f9e87f in g_main_context_prepare () from /lib/i386-linux-gnu/libglib-2.0.so.0
#3  0xb2f9f637 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#4  0xb2f9fc2a in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#5  0xb6516b37 in QEventDispatcherGlib::processEvents (this=0x8943ed8, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#6  0xb64e71dd in QEventLoop::processEvents (this=0xa98c62a0, flags=...) at kernel/qeventloop.cpp:149
#7  0xb64e7421 in QEventLoop::exec (this=0xa98c62a0, flags=...) at kernel/qeventloop.cpp:201
#8  0xb63ea90b in QThread::exec (this=0x84fe800) at thread/qthread.cpp:498
#9  0xb64c7e2d in QInotifyFileSystemWatcherEngine::run (this=0x84fe800) at io/qfilesystemwatcher_inotify.cpp:248
#10 0xb63ed7b3 in QThreadPrivate::start (arg=0x84fe800) at thread/qthread_unix.cpp:331
#11 0xb30b9d31 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#12 0xb76c90ce in clone () from /lib/i386-linux-gnu/libc.so.6
Backtrace stopped: Not enough registers or memory available to unwind further

Thread 2 (Thread 0xa729eb70 (LWP 1866)):
#0  0xb780e424 in __kernel_vsyscall ()
#1  0xb76ba40e in poll () from /lib/i386-linux-gnu/libc.so.6
#2  0xb2fae34b in g_poll () from /lib/i386-linux-gnu/libglib-2.0.so.0
#3  0xb2f9f896 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#4  0xb2f9ff9b in g_main_loop_run () from /lib/i386-linux-gnu/libglib-2.0.so.0
#5  0xa7b7ecea in ?? () from /usr/lib/i386-linux-gnu/libgio-2.0.so.0
#6  0xb2fc65f4 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#7  0xb30b9d31 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#8  0xb76c90ce in clone () from /lib/i386-linux-gnu/libc.so.6
Backtrace stopped: Not enough registers or memory available to unwind further

Thread 1 (Thread 0xb1f83b20 (LWP 1856)):
[KCrash Handler]
#7  0x3ff00000 in ?? ()
#8  0xb0b7c96f in TaskGroupItem::~TaskGroupItem (this=0x99cf078, __in_chrg=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:82
#9  0xb0b7ca42 in TaskGroupItem::~TaskGroupItem (this=0x99cf078, __in_chrg=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:83
#10 0xb64fb5f3 in qDeleteInEventHandler (o=0x99cf078) at kernel/qobject.cpp:3986
#11 0xb6500b80 in QObject::event (this=0x99cf078, e=0xa409fd8) at kernel/qobject.cpp:1200
#12 0xb60d2bd4 in QGraphicsWidget::event (this=0x99cf078, event=0xa409fd8) at graphicsview/qgraphicswidget.cpp:1455
#13 0xb5a13d54 in notify_helper (e=0xa409fd8, receiver=0x99cf078, this=0x831f020) at kernel/qapplication.cpp:4486
#14 QApplicationPrivate::notify_helper (this=0x831f020, receiver=0x99cf078, e=0xa409fd8) at kernel/qapplication.cpp:4458
#15 0xb5a19103 in QApplication::notify (this=0xa409fd8, receiver=0x99cf078, e=0xa409fd8) at kernel/qapplication.cpp:3886
#16 0xb6b4d681 in KApplication::notify (this=0x830f608, receiver=0x99cf078, event=0xa409fd8) at ../../kdeui/kernel/kapplication.cpp:311
#17 0xb64e819e in QCoreApplication::notifyInternal (this=0x830f608, receiver=0x99cf078, event=0xa409fd8) at kernel/qcoreapplication.cpp:787
#18 0xb64ebf93 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#19 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=52, data=0x82ce2e0) at kernel/qcoreapplication.cpp:1428
#20 0xb64ec0ec in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=52) at kernel/qcoreapplication.cpp:1321
#21 0xb64ec1d3 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1071
#22 0xb5a118f4 in QApplication::exec () at kernel/qapplication.cpp:3760
#23 0xb77c318b in kdemain (argc=1, argv=0xbfa1f964) at ../../../../plasma/desktop/shell/main.cpp:120
#24 0x0804850b in main (argc=1, argv=0xbfa1f964) at plasma-desktop_dummy.cpp:3

This bug may be a duplicate of or related to bug 275286.

Possible duplicates by query: bug 286733, bug 286630, bug 286544, bug 286027, bug 285724.

Reported using DrKonqi