Bug 293817

Application: plasma-desktop (0.4)
KDE Platform Version: 4.8.00 (4.8.0
Qt Version: 4.7.4
Operating System: Linux 3.0.0-16-generic x86_64
Distribution: Ubuntu 11.10

-- Information about the crash:
- What I was doing when the application crashed:
moved widget from one screen to another
- Unusual behavior I noticed:
Flickering in background image.

The crash can be reproduced every time.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f2cde3597a0 (LWP 2201))]

Thread 4 (Thread 0x7f2cb975e700 (LWP 2202)):
#0  0x00007f2cd1f7d431 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f2cdae58f3e in QEventDispatcherGlib::processEvents (this=0x21251e0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#2  0x00007f2cdae2ccf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#3  0x00007f2cdae2cef7 in QEventLoop::exec (this=0x7f2cb975ddb0, flags=...) at kernel/qeventloop.cpp:201
#4  0x00007f2cdad4427f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#5  0x00007f2cdae0fcbf in QInotifyFileSystemWatcherEngine::run (this=0x218d2b0) at io/qfilesystemwatcher_inotify.cpp:248
#6  0x00007f2cdad46d05 in QThreadPrivate::start (arg=0x218d2b0) at thread/qthread_unix.cpp:331
#7  0x00007f2cd2a89efc in start_thread (arg=0x7f2cb975e700) at pthread_create.c:304
#8  0x00007f2cddc4789d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#9  0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f2cb241c700 (LWP 2208)):
#0  __pthread_mutex_unlock_usercnt (mutex=<optimized out>, decr=<optimized out>) at pthread_mutex_unlock.c:41
#1  __pthread_mutex_unlock (mutex=0x2695fe8) at pthread_mutex_unlock.c:290
#2  0x00007f2cd1f7bfe4 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f2cd1f7cdfd in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f2cd1f7d429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f2cdae58f3e in QEventDispatcherGlib::processEvents (this=0x268ba70, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#6  0x00007f2cdae2ccf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#7  0x00007f2cdae2cef7 in QEventLoop::exec (this=0x7f2cb241bdb0, flags=...) at kernel/qeventloop.cpp:201
#8  0x00007f2cdad4427f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#9  0x00007f2cdae0fcbf in QInotifyFileSystemWatcherEngine::run (this=0x2694220) at io/qfilesystemwatcher_inotify.cpp:248
#10 0x00007f2cdad46d05 in QThreadPrivate::start (arg=0x2694220) at thread/qthread_unix.cpp:331
#11 0x00007f2cd2a89efc in start_thread (arg=0x7f2cb241c700) at pthread_create.c:304
#12 0x00007f2cddc4789d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#13 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f2cb1938700 (LWP 2209)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f2cd7e5cfe2 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#2  0x00007f2cd7e5d019 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#3  0x00007f2cd2a89efc in start_thread (arg=0x7f2cb1938700) at pthread_create.c:304
#4  0x00007f2cddc4789d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f2cde3597a0 (LWP 2201)):
[KCrash Handler]
#6  0x00007f2cdacbcbc0 in QRegion::shared_empty () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#7  0x00007f2cc2340ba9 in sceneEventFilter (event=0x7ffff8abec80, watched=<optimized out>, this=0x1e33b10) at ../../../../containments/groupingdesktop/lib/groupingcontainment.cpp:708
#8  GroupingContainment::sceneEventFilter (this=0x1e33b10, watched=<optimized out>, event=0x7ffff8abec80) at ../../../../containments/groupingdesktop/lib/groupingcontainment.cpp:686
#9  0x00007f2cda7cbfba in QGraphicsScenePrivate::filterEvent (this=0x15e53d0, item=0x1ccf180, event=0x7ffff8abec80) at graphicsview/qgraphicsscene.cpp:1177
#10 0x00007f2cda7cc065 in QGraphicsScenePrivate::sendEvent (this=0x15e53d0, item=0x1ccf180, event=0x7ffff8abec80) at graphicsview/qgraphicsscene.cpp:1205
#11 0x00007f2cda7cceec in QGraphicsScenePrivate::sendHoverEvent (this=0x15e53d0, type=<optimized out>, item=0x1ccf180, hoverEvent=0x7ffff8abee10) at graphicsview/qgraphicsscene.cpp:1264
#12 0x00007f2cda7cd49d in QGraphicsScenePrivate::dispatchHoverEvent (this=0x15e53d0, hoverEvent=0x7ffff8abee10) at graphicsview/qgraphicsscene.cpp:3931
#13 0x00007f2cda7cd822 in QGraphicsScene::mouseMoveEvent (this=<optimized out>, mouseEvent=0x7ffff8abf2f0) at graphicsview/qgraphicsscene.cpp:4090
#14 0x00007f2cda7db98b in QGraphicsScene::event (this=0x13ed060, event=0x7ffff8abf2f0) at graphicsview/qgraphicsscene.cpp:3446
#15 0x00007f2cda1dd474 in notify_helper (e=0x7ffff8abf2f0, receiver=0x13ed060, this=0x13f3bf0) at kernel/qapplication.cpp:4486
#16 QApplicationPrivate::notify_helper (this=0x13f3bf0, receiver=0x13ed060, e=0x7ffff8abf2f0) at kernel/qapplication.cpp:4458
#17 0x00007f2cda1e22e1 in QApplication::notify (this=0x13dcee0, receiver=0x13ed060, e=0x7ffff8abf2f0) at kernel/qapplication.cpp:4365
#18 0x00007f2cdbaddae6 in KApplication::notify (this=0x13dcee0, receiver=0x13ed060, event=0x7ffff8abf2f0) at ../../kdeui/kernel/kapplication.cpp:311
#19 0x00007f2cdae2dafc in QCoreApplication::notifyInternal (this=0x13dcee0, receiver=0x13ed060, event=0x7ffff8abf2f0) at kernel/qcoreapplication.cpp:787
#20 0x00007f2cda7f5999 in QGraphicsViewPrivate::mouseMoveEventHandler (this=0x2264b20, event=0x7ffff8abfc20) at graphicsview/qgraphicsview.cpp:647
#21 0x00007f2cda7f5bbe in QGraphicsView::mouseMoveEvent (this=0x2617b60, event=0x7ffff8abfc20) at graphicsview/qgraphicsview.cpp:3274
#22 0x00007f2cda22dd1e in QWidget::event (this=0x2617b60, event=0x7ffff8abfc20) at kernel/qwidget.cpp:8280
#23 0x00007f2cda5d65b6 in QFrame::event (this=0x2617b60, e=0x7ffff8abfc20) at widgets/qframe.cpp:557
#24 0x00007f2cda7f9dfb in QGraphicsView::viewportEvent (this=0x2617b60, event=0x7ffff8abfc20) at graphicsview/qgraphicsview.cpp:2864
#25 0x00007f2cdae2dc88 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=<optimized out>, receiver=0x2278160, event=0x7ffff8abfc20) at kernel/qcoreapplication.cpp:902
#26 0x00007f2cda1dd43f in notify_helper (e=0x7ffff8abfc20, receiver=0x2278160, this=0x13f3bf0) at kernel/qapplication.cpp:4482
#27 QApplicationPrivate::notify_helper (this=0x13f3bf0, receiver=0x2278160, e=0x7ffff8abfc20) at kernel/qapplication.cpp:4458
#28 0x00007f2cda1e2cbb in QApplication::notify (this=<optimized out>, receiver=0x2278160, e=0x7ffff8abfc20) at kernel/qapplication.cpp:4047
#29 0x00007f2cdbaddae6 in KApplication::notify (this=0x13dcee0, receiver=0x2278160, event=0x7ffff8abfc20) at ../../kdeui/kernel/kapplication.cpp:311
#30 0x00007f2cdae2dafc in QCoreApplication::notifyInternal (this=0x13dcee0, receiver=0x2278160, event=0x7ffff8abfc20) at kernel/qcoreapplication.cpp:787
#31 0x00007f2cda1de442 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#32 QApplicationPrivate::sendMouseEvent (receiver=0x2278160, event=0x7ffff8abfc20, alienWidget=0x2278160, nativeWidget=0x2617b60, buttonDown=0x0, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:3146
#33 0x00007f2cda25d9d5 in QETWidget::translateMouseEvent (this=0x2617b60, event=<optimized out>) at kernel/qapplication_x11.cpp:4571
#34 0x00007f2cda25c94e in QApplication::x11ProcessEvent (this=0x13dcee0, event=0x7ffff8ac0440) at kernel/qapplication_x11.cpp:3693
#35 0x00007f2cda2854a2 in x11EventSourceDispatch (s=0x13f09b0, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#36 0x00007f2cd1f7ca5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#37 0x00007f2cd1f7d258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#38 0x00007f2cd1f7d429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#39 0x00007f2cdae58ed6 in QEventDispatcherGlib::processEvents (this=0x1377f40, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#40 0x00007f2cda28510e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#41 0x00007f2cdae2ccf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#42 0x00007f2cdae2cef7 in QEventLoop::exec (this=0x7ffff8ac0810, flags=...) at kernel/qeventloop.cpp:201
#43 0x00007f2cdae31789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#44 0x00007f2cddf467e3 in kdemain (argc=1, argv=0x7ffff8ac0bf8) at ../../../../plasma/desktop/shell/main.cpp:120
#45 0x00007f2cddb8730d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7ffff8ac0bf8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffff8ac0be8) at libc-start.c:226
#46 0x0000000000400671 in _start ()

Reported using DrKonqi