Application: plasma-desktop (4.11.2)
KDE Platform Version: 4.11.2
Qt Version: 4.8.4
Operating System: Linux 3.11.0-12-generic x86_64
Distribution: Ubuntu 13.10

-- Information about the crash:
- What I was doing when the application crashed:

Right clicked on a task item, clicked close.
Right clicked again, before the window closed. 
In the mean time the window closed, and the task item disappeared
Clicked on close again.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f8d3f9227c0 (LWP 2554))]

Thread 4 (Thread 0x7f8d20515700 (LWP 2555)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f8d385ce06b in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#2  0x00007f8d385ce0a9 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#3  0x00007f8d32c88f6e in start_thread (arg=0x7f8d20515700) at pthread_create.c:311
#4  0x00007f8d3f21b9cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 3 (Thread 0x7f8c950bc700 (LWP 2559)):
#0  __libc_enable_asynccancel () at ../nptl/sysdeps/unix/sysv/linux/x86_64/cancellation.S:65
#1  0x00007f8d3f20ef72 in poll () at ../sysdeps/unix/syscall-template.S:81
#2  0x00007f8d3257e694 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f8d3257e79c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f8d3bde7a76 in QEventDispatcherGlib::processEvents (this=0x7f8c900008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#5  0x00007f8d3bdb95ef in QEventLoop::processEvents (this=this@entry=0x7f8c950bbd70, flags=...) at kernel/qeventloop.cpp:149
#6  0x00007f8d3bdb98e5 in QEventLoop::exec (this=this@entry=0x7f8c950bbd70, flags=...) at kernel/qeventloop.cpp:204
#7  0x00007f8d3bcb888f in QThread::exec (this=this@entry=0x2b11490) at thread/qthread.cpp:542
#8  0x00007f8d3bd9ad13 in QInotifyFileSystemWatcherEngine::run (this=0x2b11490) at io/qfilesystemwatcher_inotify.cpp:265
#9  0x00007f8d3bcbaf2f in QThreadPrivate::start (arg=0x2b11490) at thread/qthread_unix.cpp:338
#10 0x00007f8d32c88f6e in start_thread (arg=0x7f8c950bc700) at pthread_create.c:311
#11 0x00007f8d3f21b9cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 2 (Thread 0x7f8c8f28b700 (LWP 2560)):
#0  0x00007f8d32c8b055 in __GI___pthread_mutex_lock (mutex=0x7f8c88000a60) at pthread_mutex_lock.c:95
#1  0x00007f8d325be391 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f8c8f28abb8 in ?? ()
#3  0x00007f8d3257e11c in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f8d3257e62b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f8d3257e79c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f8d3bde7a76 in QEventDispatcherGlib::processEvents (this=0x7f8c880008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#7  0x00007f8d3bdb95ef in QEventLoop::processEvents (this=this@entry=0x7f8c8f28ad70, flags=...) at kernel/qeventloop.cpp:149
#8  0x00007f8d3bdb98e5 in QEventLoop::exec (this=this@entry=0x7f8c8f28ad70, flags=...) at kernel/qeventloop.cpp:204
#9  0x00007f8d3bcb888f in QThread::exec (this=this@entry=0x2e657d0) at thread/qthread.cpp:542
#10 0x00007f8d3bd9ad13 in QInotifyFileSystemWatcherEngine::run (this=0x2e657d0) at io/qfilesystemwatcher_inotify.cpp:265
#11 0x00007f8d3bcbaf2f in QThreadPrivate::start (arg=0x2e657d0) at thread/qthread_unix.cpp:338
#12 0x00007f8d32c88f6e in start_thread (arg=0x7f8c8f28b700) at pthread_create.c:311
#13 0x00007f8d3f21b9cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 1 (Thread 0x7f8d3f9227c0 (LWP 2554)):
[KCrash Handler]
#6  0x00007f8d3bdcc0d8 in QObject::killTimer (this=0x47f9380, id=0) at kernel/qobject.cpp:1602
#7  0x00007f8d3bdd79c1 in QTimer::stop (this=this@entry=0x47f9380) at kernel/qtimer.cpp:266
#8  0x00007f8d3bdd7a4f in QTimer::start (this=0x47f9380) at kernel/qtimer.cpp:216
#9  0x00007f8d3bdd7a88 in QTimer::start (this=<optimized out>, msec=msec@entry=800) at kernel/qtimer.cpp:234
#10 0x00007f8c9f268793 in MouseEventListener::sceneEventFilter (this=0x4f381a0, item=0x4f8da50, event=0x7fff10e9cf70) at ../../../../plasma/declarativeimports/qtextracomponents/mouseeventlistener.cpp:179
#11 0x00007f8d3b722fd5 in QGraphicsScenePrivate::filterDescendantEvent (this=this@entry=0x1168a00, item=item@entry=0x4f8da50, event=event@entry=0x7fff10e9cf70) at graphicsview/qgraphicsscene.cpp:1159
#12 0x00007f8d3b72763e in QGraphicsScenePrivate::sendEvent (this=0x1168a00, item=0x4f8da50, event=0x7fff10e9cf70) at graphicsview/qgraphicsscene.cpp:1211
#13 0x00007f8d3b727b3f in QGraphicsScenePrivate::sendMouseEvent (this=0x1168a00, mouseEvent=0x7fff10e9cf70) at graphicsview/qgraphicsscene.cpp:1295
#14 0x00007f8d3b7333b6 in QGraphicsScenePrivate::mousePressEventHandler (this=this@entry=0x1168a00, mouseEvent=mouseEvent@entry=0x7fff10e9cf70) at graphicsview/qgraphicsscene.cpp:1422
#15 0x00007f8d3b733849 in QGraphicsScene::mousePressEvent (this=<optimized out>, mouseEvent=0x7fff10e9cf70) at graphicsview/qgraphicsscene.cpp:4074
#16 0x00007f8d3b73c6d0 in QGraphicsScene::event (this=0x108dfb0, event=0x7fff10e9cf70) at graphicsview/qgraphicsscene.cpp:3455
#17 0x00007f8d3b157dfc in QApplicationPrivate::notify_helper (this=this@entry=0x10e4f00, receiver=receiver@entry=0x108dfb0, e=e@entry=0x7fff10e9cf70) at kernel/qapplication.cpp:4567
#18 0x00007f8d3b15e470 in QApplication::notify (this=this@entry=0x10dd050, receiver=receiver@entry=0x108dfb0, e=e@entry=0x7fff10e9cf70) at kernel/qapplication.cpp:4353
#19 0x00007f8d3ca7ea6a in KApplication::notify (this=0x10dd050, receiver=0x108dfb0, event=0x7fff10e9cf70) at ../../kdeui/kernel/kapplication.cpp:311
#20 0x00007f8d3bdba8bd in QCoreApplication::notifyInternal (this=0x10dd050, receiver=0x108dfb0, event=event@entry=0x7fff10e9cf70) at kernel/qcoreapplication.cpp:946
#21 0x00007f8d3b156526 in sendSpontaneousEvent (event=event@entry=0x7fff10e9cf70, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:234
#22 qt_sendSpontaneousEvent (receiver=<optimized out>, event=event@entry=0x7fff10e9cf70) at kernel/qapplication.cpp:5565
#23 0x00007f8d3b7530af in QGraphicsView::mousePressEvent (this=0x33e8ba0, event=0x7fff10e9d4e0) at graphicsview/qgraphicsview.cpp:3164
#24 0x00007f8d3b1a7191 in QWidget::event (this=this@entry=0x33e8ba0, event=event@entry=0x7fff10e9d4e0) at kernel/qwidget.cpp:8371
#25 0x00007f8d3b5485be in QFrame::event (this=0x33e8ba0, e=0x7fff10e9d4e0) at widgets/qframe.cpp:557
#26 0x00007f8d3b753e09 in QGraphicsView::viewportEvent (this=0x33e8ba0, event=0x7fff10e9d4e0) at graphicsview/qgraphicsview.cpp:2866
#27 0x00007f8d3bdbaa26 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=this@entry=0x10e4f00, receiver=receiver@entry=0x37e5440, event=event@entry=0x7fff10e9d4e0) at kernel/qcoreapplication.cpp:1056
#28 0x00007f8d3b157ddc in QApplicationPrivate::notify_helper (this=this@entry=0x10e4f00, receiver=receiver@entry=0x37e5440, e=e@entry=0x7fff10e9d4e0) at kernel/qapplication.cpp:4563
#29 0x00007f8d3b15e5ad in QApplication::notify (this=this@entry=0x10dd050, receiver=receiver@entry=0x37e5440, e=e@entry=0x7fff10e9d4e0) at kernel/qapplication.cpp:4110
#30 0x00007f8d3ca7ea6a in KApplication::notify (this=0x10dd050, receiver=0x37e5440, event=0x7fff10e9d4e0) at ../../kdeui/kernel/kapplication.cpp:311
#31 0x00007f8d3bdba8bd in QCoreApplication::notifyInternal (this=0x10dd050, receiver=receiver@entry=0x37e5440, event=event@entry=0x7fff10e9d4e0) at kernel/qcoreapplication.cpp:946
#32 0x00007f8d3b15dd63 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#33 QApplicationPrivate::sendMouseEvent (receiver=receiver@entry=0x37e5440, event=event@entry=0x7fff10e9d4e0, alienWidget=alienWidget@entry=0x37e5440, nativeWidget=nativeWidget@entry=0x33e8ba0, buttonDown=buttonDown@entry=0x7f8d3bc3c2f8 <qt_button_down>, lastMouseReceiver=..., spontaneous=spontaneous@entry=true) at kernel/qapplication.cpp:3178
#34 0x00007f8d3b1d27db in QETWidget::translateMouseEvent (this=this@entry=0x33e8ba0, event=event@entry=0x7fff10e9d860) at kernel/qapplication_x11.cpp:4631
#35 0x00007f8d3b1d2079 in QApplication::x11ProcessEvent (this=0x10dd050, event=event@entry=0x7fff10e9d860) at kernel/qapplication_x11.cpp:3624
#36 0x00007f8d3b1f9922 in x11EventSourceDispatch (s=0x10e9830, callback=0x0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#37 0x00007f8d3257e3a6 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#38 0x00007f8d3257e6f8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#39 0x00007f8d3257e79c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#40 0x00007f8d3bde7a55 in QEventDispatcherGlib::processEvents (this=0x1033ad0, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#41 0x00007f8d3b1f99d6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#42 0x00007f8d3bdb95ef in QEventLoop::processEvents (this=this@entry=0x7fff10e9dc40, flags=...) at kernel/qeventloop.cpp:149
#43 0x00007f8d3bdb98e5 in QEventLoop::exec (this=this@entry=0x7fff10e9dc40, flags=...) at kernel/qeventloop.cpp:204
#44 0x00007f8d3bdbee5b in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1218
#45 0x00007f8d3b15634c in QApplication::exec () at kernel/qapplication.cpp:3828
#46 0x00007f8d3f52527c in kdemain (argc=1, argv=0x7fff10e9de98) at ../../../../plasma/desktop/shell/main.cpp:126
#47 0x00007f8d3f142de5 in __libc_start_main (main=0x4006e0 <main(int, char**)>, argc=1, ubp_av=0x7fff10e9de98, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff10e9de88) at libc-start.c:260
#48 0x000000000040070e in _start ()

Possible duplicates by query: bug 325880, bug 325188, bug 281349.

Reported using DrKonqi