Application: plasma-desktop (4.11.00)
KDE Platform Version: 4.11.1
Qt Version: 4.8.4
Operating System: Linux 3.11.0-5-generic x86_64
Distribution: Ubuntu Saucy Salamander (development branch)

-- Information about the crash:
- What I was doing when the application crashed:
Of about 4 tasks, I wanted to move/drag the 3rd to the first position. First there was a very hectic behaviour, the task was flipping between a new launcher icon and the repositioned task in very fast succession, then eventually it crashed.

-- Backtrace:
Application: Plasma-Desktop-Umgebung (plasma-desktop), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f66b53f47c0 (LWP 1761))]

Thread 4 (Thread 0x7f6694dfe700 (LWP 1766)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f66ae08e07b in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#2  0x00007f66ae08e0b9 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#3  0x00007f66a8747f6e in start_thread (arg=0x7f6694dfe700) at pthread_create.c:311
#4  0x00007f66b4cdbe2d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 3 (Thread 0x7f6602b39700 (LWP 1772)):
#0  0x00007f66a807d538 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f66a803d6b8 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f66b18a3a76 in QEventDispatcherGlib::processEvents (this=0x7f65fc0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#3  0x00007f66b18755ef in QEventLoop::processEvents (this=this@entry=0x7f6602b38d70, flags=...) at kernel/qeventloop.cpp:149
#4  0x00007f66b18758e5 in QEventLoop::exec (this=this@entry=0x7f6602b38d70, flags=...) at kernel/qeventloop.cpp:204
#5  0x00007f66b177488f in QThread::exec (this=this@entry=0x169b310) at thread/qthread.cpp:542
#6  0x00007f66b1856d13 in QInotifyFileSystemWatcherEngine::run (this=0x169b310) at io/qfilesystemwatcher_inotify.cpp:265
#7  0x00007f66b1776f2f in QThreadPrivate::start (arg=0x169b310) at thread/qthread_unix.cpp:338
#8  0x00007f66a8747f6e in start_thread (arg=0x7f6602b39700) at pthread_create.c:311
#9  0x00007f66b4cdbe2d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 2 (Thread 0x7f65fb7d0700 (LWP 1774)):
#0  0x00007f66b4ccf3dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f66a803d5c4 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f66a803d6cc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f66b18a3a76 in QEventDispatcherGlib::processEvents (this=0x7f65f40008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#4  0x00007f66b18755ef in QEventLoop::processEvents (this=this@entry=0x7f65fb7cfd70, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f66b18758e5 in QEventLoop::exec (this=this@entry=0x7f65fb7cfd70, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007f66b177488f in QThread::exec (this=this@entry=0x1bc8250) at thread/qthread.cpp:542
#7  0x00007f66b1856d13 in QInotifyFileSystemWatcherEngine::run (this=0x1bc8250) at io/qfilesystemwatcher_inotify.cpp:265
#8  0x00007f66b1776f2f in QThreadPrivate::start (arg=0x1bc8250) at thread/qthread_unix.cpp:338
#9  0x00007f66a8747f6e in start_thread (arg=0x7f65fb7d0700) at pthread_create.c:311
#10 0x00007f66b4cdbe2d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 1 (Thread 0x7f66b53f47c0 (LWP 1761)):
[KCrash Handler]
#6  QGraphicsScenePrivate::filterDescendantEvent (this=this@entry=0xbeb360, item=item@entry=0x37fda50, event=event@entry=0x7fff844e4520) at graphicsview/qgraphicsscene.cpp:1161
#7  0x00007f66b11e363e in QGraphicsScenePrivate::sendEvent (this=0xbeb360, item=0x37fda50, event=0x7fff844e4520) at graphicsview/qgraphicsscene.cpp:1211
#8  0x00007f66b11e3b3f in QGraphicsScenePrivate::sendMouseEvent (this=0xbeb360, mouseEvent=0x7fff844e4520) at graphicsview/qgraphicsscene.cpp:1295
#9  0x00007f66b11ec6f6 in QGraphicsScene::mouseMoveEvent (this=<optimized out>, mouseEvent=0x7fff844e4520) at graphicsview/qgraphicsscene.cpp:4102
#10 0x00007f66b11f862c in QGraphicsScene::event (this=0xb25f80, event=0x7fff844e4520) at graphicsview/qgraphicsscene.cpp:3451
#11 0x00007f66b0c13dfc in QApplicationPrivate::notify_helper (this=this@entry=0x94ff10, receiver=receiver@entry=0xb25f80, e=e@entry=0x7fff844e4520) at kernel/qapplication.cpp:4567
#12 0x00007f66b0c1a470 in QApplication::notify (this=this@entry=0x94b410, receiver=receiver@entry=0xb25f80, e=e@entry=0x7fff844e4520) at kernel/qapplication.cpp:4353
#13 0x00007f66b253a9aa in KApplication::notify (this=0x94b410, receiver=0xb25f80, event=0x7fff844e4520) at ../../kdeui/kernel/kapplication.cpp:311
#14 0x00007f66b18768bd in QCoreApplication::notifyInternal (this=0x94b410, receiver=0xb25f80, event=event@entry=0x7fff844e4520) at kernel/qcoreapplication.cpp:946
#15 0x00007f66b0c12526 in sendSpontaneousEvent (event=event@entry=0x7fff844e4520, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:234
#16 qt_sendSpontaneousEvent (receiver=<optimized out>, event=event@entry=0x7fff844e4520) at kernel/qapplication.cpp:5565
#17 0x00007f66b120d8ac in QGraphicsViewPrivate::mouseMoveEventHandler (this=this@entry=0x23bd820, event=event@entry=0x7fff844e4b70) at graphicsview/qgraphicsview.cpp:646
#18 0x00007f66b120e7ba in QGraphicsView::mouseMoveEvent (this=0x23bd740, event=0x7fff844e4b70) at graphicsview/qgraphicsview.cpp:3276
#19 0x00007f66b0c63445 in QWidget::event (this=this@entry=0x23bd740, event=event@entry=0x7fff844e4b70) at kernel/qwidget.cpp:8360
#20 0x00007f66b10045ce in QFrame::event (this=0x23bd740, e=0x7fff844e4b70) at widgets/qframe.cpp:557
#21 0x00007f66b120fe09 in QGraphicsView::viewportEvent (this=0x23bd740, event=0x7fff844e4b70) at graphicsview/qgraphicsview.cpp:2866
#22 0x00007f66b1876a26 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=this@entry=0x94ff10, receiver=receiver@entry=0x23c12d0, event=event@entry=0x7fff844e4b70) at kernel/qcoreapplication.cpp:1056
#23 0x00007f66b0c13ddc in QApplicationPrivate::notify_helper (this=this@entry=0x94ff10, receiver=receiver@entry=0x23c12d0, e=e@entry=0x7fff844e4b70) at kernel/qapplication.cpp:4563
#24 0x00007f66b0c1a5ad in QApplication::notify (this=this@entry=0x94b410, receiver=receiver@entry=0x23c12d0, e=e@entry=0x7fff844e4b70) at kernel/qapplication.cpp:4110
#25 0x00007f66b253a9aa in KApplication::notify (this=0x94b410, receiver=0x23c12d0, event=0x7fff844e4b70) at ../../kdeui/kernel/kapplication.cpp:311
#26 0x00007f66b18768bd in QCoreApplication::notifyInternal (this=0x94b410, receiver=receiver@entry=0x23c12d0, event=event@entry=0x7fff844e4b70) at kernel/qcoreapplication.cpp:946
#27 0x00007f66b0c19d63 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#28 QApplicationPrivate::sendMouseEvent (receiver=receiver@entry=0x23c12d0, event=event@entry=0x7fff844e4b70, alienWidget=alienWidget@entry=0x23c12d0, nativeWidget=nativeWidget@entry=0x23bd740, buttonDown=buttonDown@entry=0x7f66b16f82f8 <qt_button_down>, lastMouseReceiver=..., spontaneous=spontaneous@entry=true) at kernel/qapplication.cpp:3178
#29 0x00007f66b0c8e7db in QETWidget::translateMouseEvent (this=this@entry=0x23bd740, event=event@entry=0x7fff844e4ef0) at kernel/qapplication_x11.cpp:4631
#30 0x00007f66b0c8e079 in QApplication::x11ProcessEvent (this=0x94b410, event=event@entry=0x7fff844e4ef0) at kernel/qapplication_x11.cpp:3624
#31 0x00007f66b0cb5922 in x11EventSourceDispatch (s=0x950550, callback=0x0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#32 0x00007f66a803d2d6 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#33 0x00007f66a803d628 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#34 0x00007f66a803d6cc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#35 0x00007f66b18a3a55 in QEventDispatcherGlib::processEvents (this=0x881ad0, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#36 0x00007f66b0cb59d6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#37 0x00007f66b18755ef in QEventLoop::processEvents (this=this@entry=0x7fff844e52d0, flags=...) at kernel/qeventloop.cpp:149
#38 0x00007f66b18758e5 in QEventLoop::exec (this=this@entry=0x7fff844e52d0, flags=...) at kernel/qeventloop.cpp:204
#39 0x00007f66b187ae5b in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1218
#40 0x00007f66b0c1234c in QApplication::exec () at kernel/qapplication.cpp:3828
#41 0x00007f66b4fe527c in kdemain (argc=1, argv=0x7fff844e5528) at ../../../../plasma/desktop/shell/main.cpp:126
#42 0x00007f66b4c03de5 in __libc_start_main (main=0x4006e0 <main(int, char**)>, argc=1, ubp_av=0x7fff844e5528, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff844e5518) at libc-start.c:260
#43 0x000000000040070e in _start ()

Possible duplicates by query: bug 324601, bug 324600, bug 324370, bug 324238, bug 324102.

Reported using DrKonqi