Application: plasma-desktop (0.4)
KDE Platform Version: 4.7.3 (4.7.3)
Qt Version: 4.7.4
Operating System: Linux 3.0.0-14-generic x86_64
Distribution: Ubuntu 11.10

-- Information about the crash:
- What I was doing when the application crashed: I was switching windows between krdc and Firefox (aurora). This is a regular crash (at least daily)

The crash can be reproduced some of the time.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7ffda59e77a0 (LWP 2108))]

Thread 4 (Thread 0x7ffd83004700 (LWP 2109)):
#0  0x00007ffda52c9773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007ffd99853f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ffd99854429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ffda24baf3e in QEventDispatcherGlib::processEvents (this=0x263e3a0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007ffda248ecf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007ffda248eef7 in QEventLoop::exec (this=0x7ffd83003db0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007ffda23a627f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007ffda2471cbf in QInotifyFileSystemWatcherEngine::run (this=0x263db10) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007ffda23a8d05 in QThreadPrivate::start (arg=0x263db10) at thread/qthread_unix.cpp:331
#9  0x00007ffd9a360efc in start_thread (arg=0x7ffd83004700) at pthread_create.c:304
#10 0x00007ffda52d589d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7ffd7bfff700 (LWP 2110)):
#0  0x00007ffda52c9773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007ffd99853f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ffd99854429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ffda24baf3e in QEventDispatcherGlib::processEvents (this=0x27f4b60, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007ffda248ecf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007ffda248eef7 in QEventLoop::exec (this=0x7ffd7bffedb0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007ffda23a627f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007ffda2471cbf in QInotifyFileSystemWatcherEngine::run (this=0x27f1a90) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007ffda23a8d05 in QThreadPrivate::start (arg=0x27f1a90) at thread/qthread_unix.cpp:331
#9  0x00007ffd9a360efc in start_thread (arg=0x7ffd7bfff700) at pthread_create.c:304
#10 0x00007ffda52d589d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7ffd7690d700 (LWP 2147)):
#0  pthread_mutex_lock (mutex=0x7ffd7c00c618) at forward.c:182
#1  0x00007ffd99853023 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ffd99853dfd in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ffd99854792 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007ffd773eb516 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#5  0x00007ffd998792b6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007ffd9a360efc in start_thread (arg=0x7ffd7690d700) at pthread_create.c:304
#7  0x00007ffda52d589d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#8  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7ffda59e77a0 (LWP 2108)):
[KCrash Handler]
#6  isNull (this=0x0) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:568
#7  operator! (this=0x0) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:574
#8  TaskManager::TaskItem::task (this=0x30ebad0) at ../../../libs/taskmanager/taskitem.cpp:113
#9  0x00007ffd8b767112 in WindowTaskItem::publishIconGeometry (this=0x2011160) at ../../../../../plasma/desktop/applets/tasks/windowtaskitem.cpp:120
#10 0x00007ffd8b775b7c in AbstractTaskItem::timerEvent (this=0x2011160, event=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/abstracttaskitem.cpp:439
#11 0x00007ffda24a6789 in QObject::event (this=0x2011160, e=<optimized out>) at kernel/qobject.cpp:1181
#12 0x00007ffda1e5e89b in QGraphicsWidget::event (this=0x2011160, event=0x7fffd8c68c00) at graphicsview/qgraphicswidget.cpp:1455
#13 0x00007ffda1840424 in notify_helper (e=0x7fffd8c68c00, receiver=0x2011160, this=0x1e77d70) at kernel/qapplication.cpp:4486
#14 QApplicationPrivate::notify_helper (this=0x1e77d70, receiver=0x2011160, e=0x7fffd8c68c00) at kernel/qapplication.cpp:4458
#15 0x00007ffda1845291 in QApplication::notify (this=0x1e67610, receiver=0x2011160, e=0x7fffd8c68c00) at kernel/qapplication.cpp:4365
#16 0x00007ffda313e126 in KApplication::notify (this=0x1e67610, receiver=0x2011160, event=0x7fffd8c68c00) at ../../kdeui/kernel/kapplication.cpp:311
#17 0x00007ffda248fafc in QCoreApplication::notifyInternal (this=0x1e67610, receiver=0x2011160, event=0x7fffd8c68c00) at kernel/qcoreapplication.cpp:787
#18 0x00007ffda24bcd62 in sendEvent (event=0x7fffd8c68c00, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#19 QTimerInfoList::activateTimers (this=0x1e759d0) at kernel/qeventdispatcher_unix.cpp:603
#20 0x00007ffda24ba538 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#21 idleTimerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:231
#22 0x00007ffd99853a5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007ffd99854258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007ffd99854429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007ffda24baed6 in QEventDispatcherGlib::processEvents (this=0x1e00f40, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#26 0x00007ffda18e807e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#27 0x00007ffda248ecf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#28 0x00007ffda248eef7 in QEventLoop::exec (this=0x7fffd8c68e90, flags=...) at kernel/qeventloop.cpp:201
#29 0x00007ffda2493789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#30 0x00007ffda55d41a3 in kdemain (argc=1, argv=0x7fffd8c69278) at ../../../../plasma/desktop/shell/main.cpp:120
#31 0x00007ffda521530d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fffd8c69278, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffd8c69268) at libc-start.c:226
#32 0x0000000000400671 in _start ()

Possible duplicates by query: bug 287670, bug 287637, bug 287611, bug 287588, bug 287545.

Reported using DrKonqi