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 right-clicked a picture in Firefox to save it.When the download window momentarily appeared Plasma crashed. There is not always a crash but say 1 in 20 times.
Strange is that many windows/programs initially open full screen, this includes said download window.
The problem has started the first week of December.

-- Backtrace:
Application: Plasma bureaublad-shell (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7ffd520217c0 (LWP 4623))]

Thread 4 (Thread 0x7ffd24d24700 (LWP 4626)):
#0  0x00007ffd4699b034 in __pthread_mutex_lock (mutex=0x24ac638) at pthread_mutex_lock.c:61
#1  0x00007ffd45e8a649 in g_main_context_acquire () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ffd45e8bd81 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ffd45e8c429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007ffd4eaf2f3e in QEventDispatcherGlib::processEvents (this=0x24ac130, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#5  0x00007ffd4eac6cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#6  0x00007ffd4eac6ef7 in QEventLoop::exec (this=0x7ffd24d23cd0, flags=...) at kernel/qeventloop.cpp:201
#7  0x00007ffd4e9de27f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#8  0x00007ffd4eaa9cbf in QInotifyFileSystemWatcherEngine::run (this=0x24ab340) at io/qfilesystemwatcher_inotify.cpp:248
#9  0x00007ffd4e9e0d05 in QThreadPrivate::start (arg=0x24ab340) at thread/qthread_unix.cpp:331
#10 0x00007ffd431a556c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#11 0x00007ffd46998efc in start_thread (arg=0x7ffd24d24700) at pthread_create.c:304
#12 0x00007ffd5190d89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#13 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7ffd23a9b700 (LWP 4630)):
#0  0xffffffffff60017b in ?? ()
#1  0x00007ffd23a9a9f0 in ?? ()
#2  0x00007fff4f54f7e7 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

Thread 2 (Thread 0x7ffd20694700 (LWP 4661)):
#0  0x00007ffd4699b034 in __pthread_mutex_lock (mutex=0x27eadd8) at pthread_mutex_lock.c:61
#1  0x00007ffd45e8b361 in g_main_context_query () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ffd45e8be6a in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ffd45e8c792 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007ffd21172516 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#5  0x00007ffd45eb12b6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007ffd431a556c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#7  0x00007ffd46998efc in start_thread (arg=0x7ffd20694700) at pthread_create.c:304
#8  0x00007ffd5190d89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#9  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7ffd520217c0 (LWP 4623)):
[KCrash Handler]
#6  isNull (this=0x4038000000000000) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:568
#7  operator! (this=0x4038000000000000) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:574
#8  TaskManager::TaskItem::task (this=0x527ba80) at ../../../libs/taskmanager/taskitem.cpp:113
#9  0x00007ffd34d74068 in WindowTaskItem::publishIconGeometry (this=0x3ef2c70, rect=...) at ../../../../../plasma/desktop/applets/tasks/windowtaskitem.cpp:130
#10 0x00007ffd34d83d24 in TaskGroupItem::publishIconGeometry (this=<optimized out>, rect=...) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:1432
#11 0x00007ffd34d83aa5 in publishIconGeometry (this=0x2dff140) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:1424
#12 TaskGroupItem::publishIconGeometry (this=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:1416
#13 0x00007ffd34d82b7c in AbstractTaskItem::timerEvent (this=0x2dff140, event=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/abstracttaskitem.cpp:439
#14 0x00007ffd4eade789 in QObject::event (this=0x2dff140, e=<optimized out>) at kernel/qobject.cpp:1181
#15 0x00007ffd4e49689b in QGraphicsWidget::event (this=0x2dff140, event=0x7fff4f4a22f0) at graphicsview/qgraphicswidget.cpp:1455
#16 0x00007ffd4de78424 in notify_helper (e=0x7fff4f4a22f0, receiver=0x2dff140, this=0x11d2b60) at kernel/qapplication.cpp:4486
#17 QApplicationPrivate::notify_helper (this=0x11d2b60, receiver=0x2dff140, e=0x7fff4f4a22f0) at kernel/qapplication.cpp:4458
#18 0x00007ffd4de7d291 in QApplication::notify (this=0x11c4420, receiver=0x2dff140, e=0x7fff4f4a22f0) at kernel/qapplication.cpp:4365
#19 0x00007ffd4f776126 in KApplication::notify (this=0x11c4420, receiver=0x2dff140, event=0x7fff4f4a22f0) at ../../kdeui/kernel/kapplication.cpp:311
#20 0x00007ffd4eac7afc in QCoreApplication::notifyInternal (this=0x11c4420, receiver=0x2dff140, event=0x7fff4f4a22f0) at kernel/qcoreapplication.cpp:787
#21 0x00007ffd4eaf4d62 in sendEvent (event=0x7fff4f4a22f0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#22 QTimerInfoList::activateTimers (this=0x11dd670) at kernel/qeventdispatcher_unix.cpp:603
#23 0x00007ffd4eaf2538 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#24 idleTimerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:231
#25 0x00007ffd45e8ba5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007ffd45e8c258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007ffd45e8c429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007ffd4eaf2ed6 in QEventDispatcherGlib::processEvents (this=0x110bf40, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#29 0x00007ffd4df2007e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#30 0x00007ffd4eac6cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#31 0x00007ffd4eac6ef7 in QEventLoop::exec (this=0x7fff4f4a2580, flags=...) at kernel/qeventloop.cpp:201
#32 0x00007ffd4eacb789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#33 0x00007ffd51c0c1a3 in kdemain (argc=1, argv=0x7fff4f4a2968) at ../../../../plasma/desktop/shell/main.cpp:120
#34 0x00007ffd5184d30d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fff4f4a2968, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff4f4a2958) at libc-start.c:226
#35 0x0000000000400671 in _start ()

Possible duplicates by query: bug 288874, bug 288866, bug 288818, bug 288811, bug 288759.

Reported using DrKonqi