Bug 285045

Summary:	Plasma desktop shell crashes on shutdown
Product:	[Unmaintained] plasma4	Reporter:	Giardy Ortellado <robertortellado>
Component:	general	Assignee:	Plasma Bugs List <plasma-bugs>
Status:	RESOLVED DUPLICATE
Severity:	crash	CC:	lara.kuzmina, marsu1
Priority:	NOR
Version:	unspecified
Target Milestone:	---
Platform:	Ubuntu
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:
Attachments:	New crash information added by DrKonqi New crash information added by DrKonqi New crash information added by DrKonqi New crash information added by DrKonqi

Description Giardy Ortellado 2011-10-26 21:38:28 UTC

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:

I was using firefox, dolphin and kate, then I closed all those programs and when I wanted to shutdown I got this crash.

-- Backtrace:
Application: Shell de escritorio Plasma (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0xb1eb6b20 (LWP 1551))]

Thread 8 (Thread 0xab5cfb70 (LWP 1553)):
#0  0xb2fefd58 in __pthread_mutex_unlock_usercnt () from /lib/i386-linux-gnu/libpthread.so.0
#1  0xb7609f54 in pthread_mutex_unlock () from /lib/i386-linux-gnu/libc.so.6
#2  0xb2ed0f16 in g_main_context_acquire () from /lib/i386-linux-gnu/libglib-2.0.so.0
#3  0xb2ed256d in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#4  0xb2ed2c2a in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#5  0xb6449b37 in QEventDispatcherGlib::processEvents (this=0x9e73f08, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#6  0xb641a1dd in QEventLoop::processEvents (this=0xab5cf2a0, flags=...) at kernel/qeventloop.cpp:149
#7  0xb641a421 in QEventLoop::exec (this=0xab5cf2a0, flags=...) at kernel/qeventloop.cpp:201
#8  0xb631d90b in QThread::exec (this=0x9e72a38) at thread/qthread.cpp:498
#9  0xb63fae2d in QInotifyFileSystemWatcherEngine::run (this=0x9e72a38) at io/qfilesystemwatcher_inotify.cpp:248
#10 0xb63207b3 in QThreadPrivate::start (arg=0x9e72a38) at thread/qthread_unix.cpp:331
#11 0xb2fecd31 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#12 0xb75fc0ce in clone () from /lib/i386-linux-gnu/libc.so.6
Backtrace stopped: Not enough registers or memory available to unwind further

Thread 7 (Thread 0xa9504b70 (LWP 1558)):
#0  0xb7738424 in __kernel_vsyscall ()
#1  0xb75ed40e in poll () from /lib/i386-linux-gnu/libc.so.6
#2  0xb2ee134b in g_poll () from /lib/i386-linux-gnu/libglib-2.0.so.0
#3  0xb2ed2896 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#4  0xb2ed2c2a in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#5  0xb6449b37 in QEventDispatcherGlib::processEvents (this=0xa194348, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#6  0xb641a1dd in QEventLoop::processEvents (this=0xa95042a0, flags=...) at kernel/qeventloop.cpp:149
#7  0xb641a421 in QEventLoop::exec (this=0xa95042a0, flags=...) at kernel/qeventloop.cpp:201
#8  0xb631d90b in QThread::exec (this=0xa164520) at thread/qthread.cpp:498
#9  0xb63fae2d in QInotifyFileSystemWatcherEngine::run (this=0xa164520) at io/qfilesystemwatcher_inotify.cpp:248
#10 0xb63207b3 in QThreadPrivate::start (arg=0xa164520) at thread/qthread_unix.cpp:331
#11 0xb2fecd31 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#12 0xb75fc0ce in clone () from /lib/i386-linux-gnu/libc.so.6
Backtrace stopped: Not enough registers or memory available to unwind further

Thread 6 (Thread 0xa6e3eb70 (LWP 1593)):
#0  0xb7609f31 in pthread_mutex_unlock () from /lib/i386-linux-gnu/libc.so.6
#1  0xb2ed2877 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#2  0xb2ed2f9b in g_main_loop_run () from /lib/i386-linux-gnu/libglib-2.0.so.0
#3  0xa771ecea in ?? () from /usr/lib/i386-linux-gnu/libgio-2.0.so.0
#4  0xb2ef95f4 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#5  0xb2fecd31 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#6  0xb75fc0ce in clone () from /lib/i386-linux-gnu/libc.so.6
Backtrace stopped: Not enough registers or memory available to unwind further

Thread 5 (Thread 0xa610cb70 (LWP 3034)):
#0  0xb7738424 in __kernel_vsyscall ()
#1  0xb2ff0a5c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/i386-linux-gnu/libpthread.so.0
#2  0xb7609cfc in pthread_cond_wait () from /lib/i386-linux-gnu/libc.so.6
#3  0xb6320cc0 in wait (time=4294967295, this=0x9e8fec0) at thread/qwaitcondition_unix.cpp:88
#4  QWaitCondition::wait (this=0x9e91218, mutex=0x9e9baa8, time=4294967295) at thread/qwaitcondition_unix.cpp:160
#5  0xb37bf406 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x9e91200, th=0xa1ca360) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365
#6  0xb37c1ecb in ThreadWeaver::WorkingHardState::waitForAvailableJob (this=0x9e9bad8, th=0xa1ca360) at ../../../threadweaver/Weaver/WorkingHardState.cpp:80
#7  0xb37bf03a in ThreadWeaver::WeaverImpl::waitForAvailableJob (this=0x9e91200, th=0xa1ca360) at ../../../threadweaver/Weaver/WeaverImpl.cpp:356
#8  0xb37c1fcc in ThreadWeaver::WorkingHardState::applyForWork (this=0x9e9bad8, th=0xa1ca360) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71
#9  0xb37bef93 in ThreadWeaver::WeaverImpl::applyForWork (this=0x9e91200, th=0xa1ca360, previous=0xb3e5c50) at ../../../threadweaver/Weaver/WeaverImpl.cpp:351
#10 0xb37c0b14 in ThreadWeaver::ThreadRunHelper::run (this=0xa610c304, parent=0x9e91200, th=0xa1ca360) at ../../../threadweaver/Weaver/Thread.cpp:87
#11 0xb37c0bca in ThreadWeaver::Thread::run (this=0xa1ca360) at ../../../threadweaver/Weaver/Thread.cpp:142
#12 0xb63207b3 in QThreadPrivate::start (arg=0xa1ca360) at thread/qthread_unix.cpp:331
#13 0xb2fecd31 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#14 0xb75fc0ce in clone () from /lib/i386-linux-gnu/libc.so.6
Backtrace stopped: Not enough registers or memory available to unwind further

Thread 4 (Thread 0xa7ff8b70 (LWP 3035)):
#0  0xb7738424 in __kernel_vsyscall ()
#1  0xb2ff0a5c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/i386-linux-gnu/libpthread.so.0
#2  0xb7609cfc in pthread_cond_wait () from /lib/i386-linux-gnu/libc.so.6
#3  0xb6320cc0 in wait (time=4294967295, this=0x9e8fec0) at thread/qwaitcondition_unix.cpp:88
#4  QWaitCondition::wait (this=0x9e91218, mutex=0x9e9baa8, time=4294967295) at thread/qwaitcondition_unix.cpp:160
#5  0xb37bf406 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x9e91200, th=0xa9ed758) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365
#6  0xb37c1ecb in ThreadWeaver::WorkingHardState::waitForAvailableJob (this=0x9e9bad8, th=0xa9ed758) at ../../../threadweaver/Weaver/WorkingHardState.cpp:80
#7  0xb37bf03a in ThreadWeaver::WeaverImpl::waitForAvailableJob (this=0x9e91200, th=0xa9ed758) at ../../../threadweaver/Weaver/WeaverImpl.cpp:356
#8  0xb37c1fcc in ThreadWeaver::WorkingHardState::applyForWork (this=0x9e9bad8, th=0xa9ed758) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71
#9  0xb37bef93 in ThreadWeaver::WeaverImpl::applyForWork (this=0x9e91200, th=0xa9ed758, previous=0x0) at ../../../threadweaver/Weaver/WeaverImpl.cpp:351
#10 0xb37c1fe8 in ThreadWeaver::WorkingHardState::applyForWork (this=0x9e9bad8, th=0xa9ed758) at ../../../threadweaver/Weaver/WorkingHardState.cpp:74
#11 0xb37bef93 in ThreadWeaver::WeaverImpl::applyForWork (this=0x9e91200, th=0xa9ed758, previous=0x0) at ../../../threadweaver/Weaver/WeaverImpl.cpp:351
#12 0xb37c1fe8 in ThreadWeaver::WorkingHardState::applyForWork (this=0x9e9bad8, th=0xa9ed758) at ../../../threadweaver/Weaver/WorkingHardState.cpp:74
#13 0xb37bef93 in ThreadWeaver::WeaverImpl::applyForWork (this=0x9e91200, th=0xa9ed758, previous=0x0) at ../../../threadweaver/Weaver/WeaverImpl.cpp:351
#14 0xb37c1fe8 in ThreadWeaver::WorkingHardState::applyForWork (this=0x9e9bad8, th=0xa9ed758) at ../../../threadweaver/Weaver/WorkingHardState.cpp:74
#15 0xb37bef93 in ThreadWeaver::WeaverImpl::applyForWork (this=0x9e91200, th=0xa9ed758, previous=0xaa3f030) at ../../../threadweaver/Weaver/WeaverImpl.cpp:351
#16 0xb37c0b14 in ThreadWeaver::ThreadRunHelper::run (this=0xa7ff8304, parent=0x9e91200, th=0xa9ed758) at ../../../threadweaver/Weaver/Thread.cpp:87
#17 0xb37c0bca in ThreadWeaver::Thread::run (this=0xa9ed758) at ../../../threadweaver/Weaver/Thread.cpp:142
#18 0xb63207b3 in QThreadPrivate::start (arg=0xa9ed758) at thread/qthread_unix.cpp:331
#19 0xb2fecd31 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#20 0xb75fc0ce in clone () from /lib/i386-linux-gnu/libc.so.6
Backtrace stopped: Not enough registers or memory available to unwind further

Thread 3 (Thread 0xa763fb70 (LWP 3036)):
#0  0xb7738424 in __kernel_vsyscall ()
#1  0xb2ff0a5c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/i386-linux-gnu/libpthread.so.0
#2  0xb7609cfc in pthread_cond_wait () from /lib/i386-linux-gnu/libc.so.6
#3  0xb6320cc0 in wait (time=4294967295, this=0x9e8fec0) at thread/qwaitcondition_unix.cpp:88
#4  QWaitCondition::wait (this=0x9e91218, mutex=0x9e9baa8, time=4294967295) at thread/qwaitcondition_unix.cpp:160
#5  0xb37bf406 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x9e91200, th=0xa8c0aa78) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365
#6  0xb37c1ecb in ThreadWeaver::WorkingHardState::waitForAvailableJob (this=0x9e9bad8, th=0xa8c0aa78) at ../../../threadweaver/Weaver/WorkingHardState.cpp:80
#7  0xb37bf03a in ThreadWeaver::WeaverImpl::waitForAvailableJob (this=0x9e91200, th=0xa8c0aa78) at ../../../threadweaver/Weaver/WeaverImpl.cpp:356
#8  0xb37c1fcc in ThreadWeaver::WorkingHardState::applyForWork (this=0x9e9bad8, th=0xa8c0aa78) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71
#9  0xb37bef93 in ThreadWeaver::WeaverImpl::applyForWork (this=0x9e91200, th=0xa8c0aa78, previous=0x0) at ../../../threadweaver/Weaver/WeaverImpl.cpp:351
#10 0xb37c1fe8 in ThreadWeaver::WorkingHardState::applyForWork (this=0x9e9bad8, th=0xa8c0aa78) at ../../../threadweaver/Weaver/WorkingHardState.cpp:74
#11 0xb37bef93 in ThreadWeaver::WeaverImpl::applyForWork (this=0x9e91200, th=0xa8c0aa78, previous=0xaf48e40) at ../../../threadweaver/Weaver/WeaverImpl.cpp:351
#12 0xb37c0b14 in ThreadWeaver::ThreadRunHelper::run (this=0xa763f304, parent=0x9e91200, th=0xa8c0aa78) at ../../../threadweaver/Weaver/Thread.cpp:87
#13 0xb37c0bca in ThreadWeaver::Thread::run (this=0xa8c0aa78) at ../../../threadweaver/Weaver/Thread.cpp:142
#14 0xb63207b3 in QThreadPrivate::start (arg=0xa8c0aa78) at thread/qthread_unix.cpp:331
#15 0xb2fecd31 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#16 0xb75fc0ce in clone () from /lib/i386-linux-gnu/libc.so.6
Backtrace stopped: Not enough registers or memory available to unwind further

Thread 2 (Thread 0xa4a77b70 (LWP 3037)):
#0  0xb7738424 in __kernel_vsyscall ()
#1  0xb2ff0a5c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/i386-linux-gnu/libpthread.so.0
#2  0xb7609cfc in pthread_cond_wait () from /lib/i386-linux-gnu/libc.so.6
#3  0xb6320cc0 in wait (time=4294967295, this=0x9e8fec0) at thread/qwaitcondition_unix.cpp:88
#4  QWaitCondition::wait (this=0x9e91218, mutex=0x9e9baa8, time=4294967295) at thread/qwaitcondition_unix.cpp:160
#5  0xb37bf406 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x9e91200, th=0xa2f5580) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365
#6  0xb37c1ecb in ThreadWeaver::WorkingHardState::waitForAvailableJob (this=0x9e9bad8, th=0xa2f5580) at ../../../threadweaver/Weaver/WorkingHardState.cpp:80
#7  0xb37bf03a in ThreadWeaver::WeaverImpl::waitForAvailableJob (this=0x9e91200, th=0xa2f5580) at ../../../threadweaver/Weaver/WeaverImpl.cpp:356
#8  0xb37c1fcc in ThreadWeaver::WorkingHardState::applyForWork (this=0x9e9bad8, th=0xa2f5580) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71
#9  0xb37bef93 in ThreadWeaver::WeaverImpl::applyForWork (this=0x9e91200, th=0xa2f5580, previous=0xad15d10) at ../../../threadweaver/Weaver/WeaverImpl.cpp:351
#10 0xb37c0b14 in ThreadWeaver::ThreadRunHelper::run (this=0xa4a77304, parent=0x9e91200, th=0xa2f5580) at ../../../threadweaver/Weaver/Thread.cpp:87
#11 0xb37c0bca in ThreadWeaver::Thread::run (this=0xa2f5580) at ../../../threadweaver/Weaver/Thread.cpp:142
#12 0xb63207b3 in QThreadPrivate::start (arg=0xa2f5580) at thread/qthread_unix.cpp:331
#13 0xb2fecd31 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#14 0xb75fc0ce in clone () from /lib/i386-linux-gnu/libc.so.6
Backtrace stopped: Not enough registers or memory available to unwind further

Thread 1 (Thread 0xb1eb6b20 (LWP 1551)):
[KCrash Handler]
#7  0xb629f1e8 in vtable for QGraphicsLayoutItem () from /usr/lib/i386-linux-gnu/libQtGui.so.4
#8  0xb087996f in TaskGroupItem::~TaskGroupItem (this=0xaa551a8, __in_chrg=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:82
#9  0xb0879a42 in TaskGroupItem::~TaskGroupItem (this=0xaa551a8, __in_chrg=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:83
#10 0xb642e5f3 in qDeleteInEventHandler (o=0xaa551a8) at kernel/qobject.cpp:3986
#11 0xb6433b80 in QObject::event (this=0xaa551a8, e=0xa9a93f8) at kernel/qobject.cpp:1200
#12 0xb6005bd4 in QGraphicsWidget::event (this=0xaa551a8, event=0xa9a93f8) at graphicsview/qgraphicswidget.cpp:1455
#13 0xb5946d54 in notify_helper (e=0xa9a93f8, receiver=0xaa551a8, this=0x9742e78) at kernel/qapplication.cpp:4486
#14 QApplicationPrivate::notify_helper (this=0x9742e78, receiver=0xaa551a8, e=0xa9a93f8) at kernel/qapplication.cpp:4458
#15 0xb594c103 in QApplication::notify (this=0xa9a93f8, receiver=0xaa551a8, e=0xa9a93f8) at kernel/qapplication.cpp:3886
#16 0xb6a80681 in KApplication::notify (this=0x9739f68, receiver=0xaa551a8, event=0xa9a93f8) at ../../kdeui/kernel/kapplication.cpp:311
#17 0xb641b19e in QCoreApplication::notifyInternal (this=0x9739f68, receiver=0xaa551a8, event=0xa9a93f8) at kernel/qcoreapplication.cpp:787
#18 0xb641ef93 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=0x96f32e0) at kernel/qcoreapplication.cpp:1428
#20 0xb641f0ec in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=52) at kernel/qcoreapplication.cpp:1321
#21 0xb641f1d3 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1071
#22 0xb59448f4 in QApplication::exec () at kernel/qapplication.cpp:3760
#23 0xb76ed18b in kdemain (argc=1, argv=0xbfe79c94) at ../../../../plasma/desktop/shell/main.cpp:120
#24 0x0804850b in main (argc=1, argv=0xbfe79c94) at plasma-desktop_dummy.cpp:3

Possible duplicates by query: bug 279613.

Reported using DrKonqi

Comment 1 Christoph Feck 2011-10-26 21:51:33 UTC


*** This bug has been marked as a duplicate of bug 275286 ***

Comment 2 marsu1 2011-10-29 18:32:31 UTC

Created attachment 65018 [details]
New crash information added by DrKonqi

plasma-desktop (0.4) on KDE Platform 4.7.2 (4.7.2) using Qt 4.7.4

- What I was doing when the application crashed: I was shutting down my system, one folder was still open

-- Backtrace (Reduced):
#7  0x00007f9b5749eb96 in TaskGroupItem::~TaskGroupItem (this=0x3cde140, __in_chrg=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:82
#8  0x00007f9b5749ec49 in TaskGroupItem::~TaskGroupItem (this=0x3cde140, __in_chrg=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:83
#9  0x00007f9b6ddd8a88 in QObject::event (this=0x3cde140, e=<optimized out>) at kernel/qobject.cpp:1200
#10 0x00007f9b6d79089b in QGraphicsWidget::event (this=0x3cde140, event=0x4b4e290) at graphicsview/qgraphicswidget.cpp:1455
#11 0x00007f9b6d172424 in notify_helper (e=0x4b4e290, receiver=0x3cde140, this=0x25c7790) at kernel/qapplication.cpp:4486

Comment 3 marsu1 2011-10-29 18:32:31 UTC

Created attachment 65019 [details]
New crash information added by DrKonqi

plasma-desktop (0.4) on KDE Platform 4.7.2 (4.7.2) using Qt 4.7.4

- What I was doing when the application crashed: I was shutting down my system, one folder was still open

-- Backtrace (Reduced):
#7  0x00007f9b5749eb96 in TaskGroupItem::~TaskGroupItem (this=0x3cde140, __in_chrg=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:82
#8  0x00007f9b5749ec49 in TaskGroupItem::~TaskGroupItem (this=0x3cde140, __in_chrg=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:83
#9  0x00007f9b6ddd8a88 in QObject::event (this=0x3cde140, e=<optimized out>) at kernel/qobject.cpp:1200
#10 0x00007f9b6d79089b in QGraphicsWidget::event (this=0x3cde140, event=0x4b4e290) at graphicsview/qgraphicswidget.cpp:1455
#11 0x00007f9b6d172424 in notify_helper (e=0x4b4e290, receiver=0x3cde140, this=0x25c7790) at kernel/qapplication.cpp:4486

Comment 4 marsu1 2011-10-29 18:32:31 UTC

Created attachment 65020 [details]
New crash information added by DrKonqi

plasma-desktop (0.4) on KDE Platform 4.7.2 (4.7.2) using Qt 4.7.4

- What I was doing when the application crashed: I was shutting down my system, one folder was still open

-- Backtrace (Reduced):
#7  0x00007f9b5749eb96 in TaskGroupItem::~TaskGroupItem (this=0x3cde140, __in_chrg=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:82
#8  0x00007f9b5749ec49 in TaskGroupItem::~TaskGroupItem (this=0x3cde140, __in_chrg=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:83
#9  0x00007f9b6ddd8a88 in QObject::event (this=0x3cde140, e=<optimized out>) at kernel/qobject.cpp:1200
#10 0x00007f9b6d79089b in QGraphicsWidget::event (this=0x3cde140, event=0x4b4e290) at graphicsview/qgraphicswidget.cpp:1455
#11 0x00007f9b6d172424 in notify_helper (e=0x4b4e290, receiver=0x3cde140, this=0x25c7790) at kernel/qapplication.cpp:4486

Comment 5 lara.kuzmina@gmail.com 2011-11-24 14:18:36 UTC

Created attachment 66044 [details]
New crash information added by DrKonqi

plasma-desktop (0.4) on KDE Platform 4.7.2 (4.7.2) using Qt 4.7.4

- What I was doing when the application crashed:
before shutting down my laptop I closed Opera, Dolphin, Kate, then clicked K-button and choose Exit - in that moment Plasma crashed

-- Backtrace (Reduced):
#8  0x037e296f in TaskGroupItem::~TaskGroupItem (this=0xb06dda0, __in_chrg=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:82
#9  0x037e2a42 in TaskGroupItem::~TaskGroupItem (this=0xb06dda0, __in_chrg=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:83
#10 0x078705f3 in qDeleteInEventHandler (o=0xb06dda0) at kernel/qobject.cpp:3986
#11 0x07875b80 in QObject::event (this=0xb06dda0, e=0x9935238) at kernel/qobject.cpp:1200
#12 0x02f1ebd4 in QGraphicsWidget::event (this=0xb06dda0, event=0x9935238) at graphicsview/qgraphicswidget.cpp:1455