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 wrote in the mail after sending Thunderbidre and restart the dektop palsma.

- Unusual behavior I noticed:
Often this happens when the option is off computer.

The crash can be reproduced some of the time.

-- Backtrace:
Application: Shell plochy Plasma (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f9bfff007c0 (LWP 1834))]

Thread 4 (Thread 0x7f9bd9cf3700 (LWP 1835)):
#0  0x00007f9bff7de773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f9bf3d68f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f9bf3d69429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f9bfc9cff3e in QEventDispatcherGlib::processEvents (this=0x2a22560, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007f9bfc9a3cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f9bfc9a3ef7 in QEventLoop::exec (this=0x7f9bd9cf2cd0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007f9bfc8bb27f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007f9bfc986cbf in QInotifyFileSystemWatcherEngine::run (this=0x2a0dc20) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f9bfc8bdd05 in QThreadPrivate::start (arg=0x2a0dc20) at thread/qthread_unix.cpp:331
#9  0x00007f9bf108256c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#10 0x00007f9bf4875efc in start_thread (arg=0x7f9bd9cf3700) at pthread_create.c:304
#11 0x00007f9bff7ea89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f9bd2fa0700 (LWP 1838)):
#0  0xffffffffff60017b in ?? ()
#1  0x00007f9bd2f9f9f0 in ?? ()
#2  0x00007fffdefff7e7 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

Thread 2 (Thread 0x7f9bcf71e700 (LWP 1844)):
#0  0x00007f9bf4878034 in __pthread_mutex_lock (mutex=0x3307508) at pthread_mutex_lock.c:61
#1  0x00007f9bf3d68361 in g_main_context_query () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f9bf3d68e6a in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f9bf3d69792 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f9bd01fc516 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#5  0x00007f9bf3d8e2b6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f9bf108256c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#7  0x00007f9bf4875efc in start_thread (arg=0x7f9bcf71e700) at pthread_create.c:304
#8  0x00007f9bff7ea89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#9  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f9bfff007c0 (LWP 1834)):
[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=0x4136a90) at ../../../libs/taskmanager/taskitem.cpp:113
#9  0x00007f9be4694112 in WindowTaskItem::publishIconGeometry (this=0x458ea30) at ../../../../../plasma/desktop/applets/tasks/windowtaskitem.cpp:120
#10 0x00007f9be46a2b7c in AbstractTaskItem::timerEvent (this=0x458ea30, event=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/abstracttaskitem.cpp:439
#11 0x00007f9bfc9bb789 in QObject::event (this=0x458ea30, e=<optimized out>) at kernel/qobject.cpp:1181
#12 0x00007f9bfc37389b in QGraphicsWidget::event (this=0x458ea30, event=0x7fffdeeee280) at graphicsview/qgraphicswidget.cpp:1455
#13 0x00007f9bfbd55424 in notify_helper (e=0x7fffdeeee280, receiver=0x458ea30, this=0x1f89860) at kernel/qapplication.cpp:4486
#14 QApplicationPrivate::notify_helper (this=0x1f89860, receiver=0x458ea30, e=0x7fffdeeee280) at kernel/qapplication.cpp:4458
#15 0x00007f9bfbd5a291 in QApplication::notify (this=0x1f7bfe0, receiver=0x458ea30, e=0x7fffdeeee280) at kernel/qapplication.cpp:4365
#16 0x00007f9bfd653126 in KApplication::notify (this=0x1f7bfe0, receiver=0x458ea30, event=0x7fffdeeee280) at ../../kdeui/kernel/kapplication.cpp:311
#17 0x00007f9bfc9a4afc in QCoreApplication::notifyInternal (this=0x1f7bfe0, receiver=0x458ea30, event=0x7fffdeeee280) at kernel/qcoreapplication.cpp:787
#18 0x00007f9bfc9d1d62 in sendEvent (event=0x7fffdeeee280, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#19 QTimerInfoList::activateTimers (this=0x1f8de40) at kernel/qeventdispatcher_unix.cpp:603
#20 0x00007f9bfc9cf538 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#21 idleTimerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:231
#22 0x00007f9bf3d68a5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007f9bf3d69258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007f9bf3d69429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007f9bfc9cfed6 in QEventDispatcherGlib::processEvents (this=0x1ecff40, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#26 0x00007f9bfbdfd07e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#27 0x00007f9bfc9a3cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#28 0x00007f9bfc9a3ef7 in QEventLoop::exec (this=0x7fffdeeee510, flags=...) at kernel/qeventloop.cpp:201
#29 0x00007f9bfc9a8789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#30 0x00007f9bffae91a3 in kdemain (argc=1, argv=0x7fffdeeee8f8) at ../../../../plasma/desktop/shell/main.cpp:120
#31 0x00007f9bff72a30d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fffdeeee8f8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffdeeee8e8) at libc-start.c:226
#32 0x0000000000400671 in _start ()

Possible duplicates by query: bug 291000, bug 290995, bug 290994, bug 290993, bug 290969.

Reported using DrKonqi