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 open Muse then the system bar crashed. The muse's window was alone on my screen. After a clic on the desktop, all is back..

The crash can be reproduced every time.

-- Backtrace:
Application: Outil de gestion de fenêtres Plasma (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7fa82cf067a0 (LWP 1783))]

Thread 4 (Thread 0x7fa804b8c700 (LWP 1785)):
#0  0x00007fa82c7ed773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007fa820d77f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fa820d78429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fa8299def3e in QEventDispatcherGlib::processEvents (this=0x2b92c60, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007fa8299b2cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007fa8299b2ef7 in QEventLoop::exec (this=0x7fa804b8bdb0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007fa8298ca27f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007fa829995cbf in QInotifyFileSystemWatcherEngine::run (this=0x2b91e80) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007fa8298ccd05 in QThreadPrivate::start (arg=0x2b91e80) at thread/qthread_unix.cpp:331
#9  0x00007fa821884efc in start_thread (arg=0x7fa804b8c700) at pthread_create.c:304
#10 0x00007fa82c7f989d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7fa7fd7fa700 (LWP 1812)):
#0  0x00007fa8218881fd in __pthread_mutex_unlock_usercnt (mutex=<optimized out>, decr=<optimized out>) at pthread_mutex_unlock.c:52
#1  __pthread_mutex_unlock (mutex=0x7fa7e8000bb8) at pthread_mutex_unlock.c:290
#2  0x00007fa820d76fe4 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fa820d77dfd in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fa820d78429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fa8299def3e in QEventDispatcherGlib::processEvents (this=0x7fa7e8000ac0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#6  0x00007fa8299b2cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#7  0x00007fa8299b2ef7 in QEventLoop::exec (this=0x7fa7fd7f9db0, flags=...) at kernel/qeventloop.cpp:201
#8  0x00007fa8298ca27f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#9  0x00007fa829995cbf in QInotifyFileSystemWatcherEngine::run (this=0x32d7c90) at io/qfilesystemwatcher_inotify.cpp:248
#10 0x00007fa8298ccd05 in QThreadPrivate::start (arg=0x32d7c90) at thread/qthread_unix.cpp:331
#11 0x00007fa821884efc in start_thread (arg=0x7fa7fd7fa700) at pthread_create.c:304
#12 0x00007fa82c7f989d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#13 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fa7ed4d0700 (LWP 1819)):
#0  0x00007fa82c7ed773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007fa820d77f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fa820d78792 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fa7edfae516 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007fa820d9d2b6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fa821884efc in start_thread (arg=0x7fa7ed4d0700) at pthread_create.c:304
#6  0x00007fa82c7f989d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fa82cf067a0 (LWP 1783)):
[KCrash Handler]
#6  isNull (this=0xc043800000000000) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:568
#7  operator! (this=0xc043800000000000) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:574
#8  TaskManager::TaskItem::task (this=0xc40c20) at ../../../libs/taskmanager/taskitem.cpp:113
#9  0x00007fa810839068 in WindowTaskItem::publishIconGeometry (this=0x4ec6200, rect=...) at ../../../../../plasma/desktop/applets/tasks/windowtaskitem.cpp:130
#10 0x00007fa810848d24 in TaskGroupItem::publishIconGeometry (this=<optimized out>, rect=...) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:1432
#11 0x00007fa810848aa5 in publishIconGeometry (this=0x4ec5660) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:1424
#12 TaskGroupItem::publishIconGeometry (this=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:1416
#13 0x00007fa810847b7c in AbstractTaskItem::timerEvent (this=0x4ec5660, event=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/abstracttaskitem.cpp:439
#14 0x00007fa8299ca789 in QObject::event (this=0x4ec5660, e=<optimized out>) at kernel/qobject.cpp:1181
#15 0x00007fa82938289b in QGraphicsWidget::event (this=0x4ec5660, event=0x7fffbed3d6d0) at graphicsview/qgraphicswidget.cpp:1455
#16 0x00007fa828d64424 in notify_helper (e=0x7fffbed3d6d0, receiver=0x4ec5660, this=0x98f9a0) at kernel/qapplication.cpp:4486
#17 QApplicationPrivate::notify_helper (this=0x98f9a0, receiver=0x4ec5660, e=0x7fffbed3d6d0) at kernel/qapplication.cpp:4458
#18 0x00007fa828d69291 in QApplication::notify (this=0x971ef0, receiver=0x4ec5660, e=0x7fffbed3d6d0) at kernel/qapplication.cpp:4365
#19 0x00007fa82a662126 in KApplication::notify (this=0x971ef0, receiver=0x4ec5660, event=0x7fffbed3d6d0) at ../../kdeui/kernel/kapplication.cpp:311
#20 0x00007fa8299b3afc in QCoreApplication::notifyInternal (this=0x971ef0, receiver=0x4ec5660, event=0x7fffbed3d6d0) at kernel/qcoreapplication.cpp:787
#21 0x00007fa8299e0d62 in sendEvent (event=0x7fffbed3d6d0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#22 QTimerInfoList::activateTimers (this=0x993480) at kernel/qeventdispatcher_unix.cpp:603
#23 0x00007fa8299de538 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#24 idleTimerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:231
#25 0x00007fa820d77a5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007fa820d78258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007fa820d78429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007fa8299deed6 in QEventDispatcherGlib::processEvents (this=0x90df40, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#29 0x00007fa828e0c07e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#30 0x00007fa8299b2cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#31 0x00007fa8299b2ef7 in QEventLoop::exec (this=0x7fffbed3d960, flags=...) at kernel/qeventloop.cpp:201
#32 0x00007fa8299b7789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#33 0x00007fa82caf81a3 in kdemain (argc=1, argv=0x7fffbed3dd48) at ../../../../plasma/desktop/shell/main.cpp:120
#34 0x00007fa82c73930d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fffbed3dd48, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffbed3dd38) at libc-start.c:226
#35 0x0000000000400671 in _start ()

Possible duplicates by query: bug 291187, bug 291180, bug 291127, bug 291125, bug 291121.

Reported using DrKonqi