Application: plasma-desktop (0.4)
KDE Platform Version: 4.7.3 (4.7.3) (Compiled from sources)
Qt Version: 4.7.4
Operating System: Linux 3.0.0-13-generic x86_64
Distribution: Ubuntu 11.10

-- Information about the crash:
- Using the browser chrome:

- Sometimes the failure is sometimes not:

- Has not been done neiuma custom configuration has been activated only the transparency:

-- Backtrace:
Application: Shell da área de trabalho do Plasma (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f83e427b7a0 (LWP 1693))]

Thread 3 (Thread 0x7f83c308b700 (LWP 1694)):
#0  0xffffffffff60017b in ?? ()
#1  0x00007f83c308aad0 in ?? ()
#2  0x00007fff903ff7e7 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

Thread 2 (Thread 0x7f83b9277700 (LWP 1700)):
#0  0x00007f83e3b4e773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f83d80d8f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f83d80d9792 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f83b9d55516 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007f83d80fe2b6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f83d8be5efc in start_thread (arg=0x7f83b9277700) at pthread_create.c:304
#6  0x00007f83e3b5a89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f83e427b7a0 (LWP 1693)):
[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=0x1e0cd60) at ../../../libs/taskmanager/taskitem.cpp:113
#9  0x00007f83ca423112 in WindowTaskItem::publishIconGeometry (this=0x2c014f0) at ../../../../../plasma/desktop/applets/tasks/windowtaskitem.cpp:120
#10 0x00007f83ca431b7c in AbstractTaskItem::timerEvent (this=0x2c014f0, event=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/abstracttaskitem.cpp:439
#11 0x00007f83e0d2b789 in QObject::event (this=0x2c014f0, e=<optimized out>) at kernel/qobject.cpp:1181
#12 0x00007f83e06e389b in QGraphicsWidget::event (this=0x2c014f0, event=0x7fff90309060) at graphicsview/qgraphicswidget.cpp:1455
#13 0x00007f83e00c5424 in notify_helper (e=0x7fff90309060, receiver=0x2c014f0, this=0x15dda80) at kernel/qapplication.cpp:4486
#14 QApplicationPrivate::notify_helper (this=0x15dda80, receiver=0x2c014f0, e=0x7fff90309060) at kernel/qapplication.cpp:4458
#15 0x00007f83e00ca291 in QApplication::notify (this=0x15da150, receiver=0x2c014f0, e=0x7fff90309060) at kernel/qapplication.cpp:4365
#16 0x00007f83e19c3126 in KApplication::notify (this=0x15da150, receiver=0x2c014f0, event=0x7fff90309060) at ../../kdeui/kernel/kapplication.cpp:311
#17 0x00007f83e0d14afc in QCoreApplication::notifyInternal (this=0x15da150, receiver=0x2c014f0, event=0x7fff90309060) at kernel/qcoreapplication.cpp:787
#18 0x00007f83e0d41d62 in sendEvent (event=0x7fff90309060, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#19 QTimerInfoList::activateTimers (this=0x15e0520) at kernel/qeventdispatcher_unix.cpp:603
#20 0x00007f83e0d3f538 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#21 idleTimerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:231
#22 0x00007f83d80d8a5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007f83d80d9258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007f83d80d9429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007f83e0d3fed6 in QEventDispatcherGlib::processEvents (this=0x154df40, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#26 0x00007f83e016d07e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#27 0x00007f83e0d13cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#28 0x00007f83e0d13ef7 in QEventLoop::exec (this=0x7fff903092f0, flags=...) at kernel/qeventloop.cpp:201
#29 0x00007f83e0d18789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#30 0x00007f83e3e591a3 in kdemain (argc=1, argv=0x7fff903096d8) at ../../../../plasma/desktop/shell/main.cpp:120
#31 0x00007f83e3a9a30d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fff903096d8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff903096c8) at libc-start.c:226
#32 0x0000000000400671 in _start ()

Possible duplicates by query: bug 287637, bug 287611, bug 287588, bug 287545, bug 287512.

Reported using DrKonqi