Application: plasma-desktop (0.4)
KDE Platform Version: 4.7.3 (4.7.3)
Qt Version: 4.7.4
Operating System: Linux 3.0.0-15-generic x86_64
Distribution: Ubuntu 11.10

-- Information about the crash:
sometimes plasma crashes when taskbar make changes

The crash can be reproduced some of the time.

-- Backtrace:
Application: Оболочка Plasma (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f379806f7c0 (LWP 1948))]

Thread 2 (Thread 0x7f3778481700 (LWP 1949)):
#0  0x00007f379795c773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f378bee6f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f378bee7429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f3794b4df3e in QEventDispatcherGlib::processEvents (this=0x1c186c0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007f3794b21cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f3794b21ef7 in QEventLoop::exec (this=0x7f3778480cd0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007f3794a3927f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007f3794b04cbf in QInotifyFileSystemWatcherEngine::run (this=0x1c15090) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f3794a3bd05 in QThreadPrivate::start (arg=0x1c15090) at thread/qthread_unix.cpp:331
#9  0x00007f378920025a in ?? () from /usr/lib/nvidia-current-updates/libGL.so.1
#10 0x00007f378c9f3efc in start_thread (arg=0x7f3778481700) at pthread_create.c:304
#11 0x00007f379796889d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f379806f7c0 (LWP 1948)):
[KCrash Handler]
#6  isNull (this=0x2200000515) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:568
#7  operator! (this=0x2200000515) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:574
#8  TaskManager::TaskItem::task (this=0x276a550) at ../../../libs/taskmanager/taskitem.cpp:113
#9  0x00007f377b96d112 in WindowTaskItem::publishIconGeometry (this=0x26109b0) at ../../../../../plasma/desktop/applets/tasks/windowtaskitem.cpp:120
#10 0x00007f377b97bb7c in AbstractTaskItem::timerEvent (this=0x26109b0, event=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/abstracttaskitem.cpp:439
#11 0x00007f3794b39789 in QObject::event (this=0x26109b0, e=<optimized out>) at kernel/qobject.cpp:1181
#12 0x00007f37944f189b in QGraphicsWidget::event (this=0x26109b0, event=0x7fff565aedc0) at graphicsview/qgraphicswidget.cpp:1455
#13 0x00007f3793ed3424 in notify_helper (e=0x7fff565aedc0, receiver=0x26109b0, this=0xf8f8f0) at kernel/qapplication.cpp:4486
#14 QApplicationPrivate::notify_helper (this=0xf8f8f0, receiver=0x26109b0, e=0x7fff565aedc0) at kernel/qapplication.cpp:4458
#15 0x00007f3793ed8291 in QApplication::notify (this=0xf6e050, receiver=0x26109b0, e=0x7fff565aedc0) at kernel/qapplication.cpp:4365
#16 0x00007f37957d1126 in KApplication::notify (this=0xf6e050, receiver=0x26109b0, event=0x7fff565aedc0) at ../../kdeui/kernel/kapplication.cpp:311
#17 0x00007f3794b22afc in QCoreApplication::notifyInternal (this=0xf6e050, receiver=0x26109b0, event=0x7fff565aedc0) at kernel/qcoreapplication.cpp:787
#18 0x00007f3794b4fd62 in sendEvent (event=0x7fff565aedc0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#19 QTimerInfoList::activateTimers (this=0xf94140) at kernel/qeventdispatcher_unix.cpp:603
#20 0x00007f3794b4d538 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#21 idleTimerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:231
#22 0x00007f378bee6a5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007f378bee7258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007f378bee7429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007f3794b4ded6 in QEventDispatcherGlib::processEvents (this=0xecff40, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#26 0x00007f3793f7b07e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#27 0x00007f3794b21cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#28 0x00007f3794b21ef7 in QEventLoop::exec (this=0x7fff565af050, flags=...) at kernel/qeventloop.cpp:201
#29 0x00007f3794b26789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#30 0x00007f3797c671a3 in kdemain (argc=1, argv=0x7fff565af438) at ../../../../plasma/desktop/shell/main.cpp:120
#31 0x00007f37978a830d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fff565af438, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff565af428) at libc-start.c:226
#32 0x0000000000400671 in _start ()

This bug may be a duplicate of or related to bug 272495.

Possible duplicates by query: bug 290030, bug 290004, bug 289985, bug 289957, bug 289952.

Reported using DrKonqi