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 3.0.0-14-generic x86_64
Distribution: Ubuntu 11.10

-- Information about the crash:
- What I was doing when the application crashed:
it craches  when log out from system. This problem started to occur when I upgraded entirely my OS.

The crash can be reproduced some of the time.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f9df63d17a0 (LWP 2065))]

Thread 4 (Thread 0x7f9dd4ece700 (LWP 2096)):
#0  0x00007f9df5cb2773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f9dea23cf68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f9dea23d429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f9df2ea3f3e in QEventDispatcherGlib::processEvents (this=0x17b0f30, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007f9df2e77cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f9df2e77ef7 in QEventLoop::exec (this=0x7f9dd4ecddb0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007f9df2d8f27f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007f9df2e5acbf in QInotifyFileSystemWatcherEngine::run (this=0x17af7b0) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f9df2d91d05 in QThreadPrivate::start (arg=0x17af7b0) at thread/qthread_unix.cpp:331
#9  0x00007f9dead49efc in start_thread (arg=0x7f9dd4ece700) at pthread_create.c:304
#10 0x00007f9df5cbe89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f9dcc612700 (LWP 2097)):
#0  0x00007f9dead4d1fd in __pthread_mutex_unlock_usercnt (mutex=<optimized out>, decr=<optimized out>) at pthread_mutex_unlock.c:52
#1  __pthread_mutex_unlock (mutex=0x1bc3008) at pthread_mutex_unlock.c:290
#2  0x00007f9dea23cd79 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f9dea23d429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f9df2ea3f3e in QEventDispatcherGlib::processEvents (this=0x1bc2fe0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#5  0x00007f9df2e77cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#6  0x00007f9df2e77ef7 in QEventLoop::exec (this=0x7f9dcc611db0, flags=...) at kernel/qeventloop.cpp:201
#7  0x00007f9df2d8f27f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#8  0x00007f9df2e5acbf in QInotifyFileSystemWatcherEngine::run (this=0x1bc23b0) at io/qfilesystemwatcher_inotify.cpp:248
#9  0x00007f9df2d91d05 in QThreadPrivate::start (arg=0x1bc23b0) at thread/qthread_unix.cpp:331
#10 0x00007f9dead49efc in start_thread (arg=0x7f9dcc612700) at pthread_create.c:304
#11 0x00007f9df5cbe89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f9dc93c3700 (LWP 2103)):
#0  0x00007f9df5cb2773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f9dea23cf68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f9dea23d792 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f9dc9ea1516 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007f9dea2622b6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f9dead49efc in start_thread (arg=0x7f9dc93c3700) at pthread_create.c:304
#6  0x00007f9df5cbe89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f9df63d17a0 (LWP 2065)):
[KCrash Handler]
#6  operator== (value=0, this=0x130000000e) at /usr/include/qt4/QtCore/qbasicatomic.h:70
#7  isNull (this=0x1013070) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:568
#8  operator! (this=0x1013070) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:574
#9  TaskManager::TaskItem::task (this=<optimized out>) at ../../../libs/taskmanager/taskitem.cpp:113
#10 0x00007f9ddbf54112 in WindowTaskItem::publishIconGeometry (this=0x293eef0) at ../../../../../plasma/desktop/applets/tasks/windowtaskitem.cpp:120
#11 0x00007f9ddbf62b7c in AbstractTaskItem::timerEvent (this=0x293eef0, event=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/abstracttaskitem.cpp:439
#12 0x00007f9df2e8f789 in QObject::event (this=0x293eef0, e=<optimized out>) at kernel/qobject.cpp:1181
#13 0x00007f9df284789b in QGraphicsWidget::event (this=0x293eef0, event=0x7fffad47e9f0) at graphicsview/qgraphicswidget.cpp:1455
#14 0x00007f9df2229424 in notify_helper (e=0x7fffad47e9f0, receiver=0x293eef0, this=0xe861f0) at kernel/qapplication.cpp:4486
#15 QApplicationPrivate::notify_helper (this=0xe861f0, receiver=0x293eef0, e=0x7fffad47e9f0) at kernel/qapplication.cpp:4458
#16 0x00007f9df222e291 in QApplication::notify (this=0xe77e00, receiver=0x293eef0, e=0x7fffad47e9f0) at kernel/qapplication.cpp:4365
#17 0x00007f9df3b27126 in KApplication::notify (this=0xe77e00, receiver=0x293eef0, event=0x7fffad47e9f0) at ../../kdeui/kernel/kapplication.cpp:311
#18 0x00007f9df2e78afc in QCoreApplication::notifyInternal (this=0xe77e00, receiver=0x293eef0, event=0x7fffad47e9f0) at kernel/qcoreapplication.cpp:787
#19 0x00007f9df2ea5d62 in sendEvent (event=0x7fffad47e9f0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#20 QTimerInfoList::activateTimers (this=0xe89f00) at kernel/qeventdispatcher_unix.cpp:603
#21 0x00007f9df2ea3514 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#22 0x00007f9dea23ca5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007f9dea23d258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007f9dea23d429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007f9df2ea3ed6 in QEventDispatcherGlib::processEvents (this=0xe16f40, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#26 0x00007f9df22d107e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#27 0x00007f9df2e77cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#28 0x00007f9df2e77ef7 in QEventLoop::exec (this=0x7fffad47ec80, flags=...) at kernel/qeventloop.cpp:201
#29 0x00007f9df2e7c789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#30 0x00007f9df5fbd1a3 in kdemain (argc=1, argv=0x7fffad47f068) at ../../../../plasma/desktop/shell/main.cpp:120
#31 0x00007f9df5bfe30d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fffad47f068, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffad47f058) at libc-start.c:226
#32 0x0000000000400671 in _start ()

Possible duplicates by query: bug 291893, bug 291785, bug 291689, bug 291619, bug 291569.

Reported using DrKonqi