Application: plasma-desktop (0.4)
KDE Platform Version: 4.7.3 (4.7.3)
Qt Version: 4.7.4
Operating System: Linux 3.0.0-12-generic x86_64
Distribution: Ubuntu 11.10

-- Information about the crash:
- What I was doing when the application crashed:
I was using Chromium and clicked on the taskbar to switch applications

The crash can be reproduced some of the time.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7fc6222dd7c0 (LWP 1632))]

Thread 4 (Thread 0x7fc6033c3700 (LWP 1633)):
#0  __pthread_mutex_lock (mutex=0x1a5c948) at pthread_mutex_lock.c:127
#1  0x00007fc61614e044 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc61614e429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc61edb4f3e in QEventDispatcherGlib::processEvents (this=0x1a3a3a0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007fc61ed88cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007fc61ed88ef7 in QEventLoop::exec (this=0x7fc6033c2cd0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007fc61eca027f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007fc61ed6bcbf in QInotifyFileSystemWatcherEngine::run (this=0x1a4eb30) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007fc61eca2d05 in QThreadPrivate::start (arg=0x1a4eb30) at thread/qthread_unix.cpp:331
#9  0x00007fc61346756c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#10 0x00007fc616c5aefc in start_thread (arg=0x7fc6033c3700) at pthread_create.c:304
#11 0x00007fc621bcf89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7fc6011b0700 (LWP 1634)):
#0  0x00007fc621bc3773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007fc61614df68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc61614e429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc61edb4f3e in QEventDispatcherGlib::processEvents (this=0x1acd980, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007fc61ed88cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007fc61ed88ef7 in QEventLoop::exec (this=0x7fc6011afcd0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007fc61eca027f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007fc61ed6bcbf in QInotifyFileSystemWatcherEngine::run (this=0x1accc40) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007fc61eca2d05 in QThreadPrivate::start (arg=0x1accc40) at thread/qthread_unix.cpp:331
#9  0x00007fc61346756c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#10 0x00007fc616c5aefc in start_thread (arg=0x7fc6011b0700) at pthread_create.c:304
#11 0x00007fc621bcf89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fc5f2371700 (LWP 1642)):
#0  0x00007fc621bc3773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007fc61614df68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc61614e792 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc5f2e4f516 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007fc6161732b6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fc61346756c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#6  0x00007fc616c5aefc in start_thread (arg=0x7fc5f2371700) at pthread_create.c:304
#7  0x00007fc621bcf89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#8  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fc6222dd7c0 (LWP 1632)):
[KCrash Handler]
#6  isNull (this=0x4d0000) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:568
#7  operator! (this=0x4d0000) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:574
#8  TaskManager::TaskItem::task (this=0x286a760) at ../../../libs/taskmanager/taskitem.cpp:113
#9  0x00007fc606aa8112 in WindowTaskItem::publishIconGeometry (this=0x4535960) at ../../../../../plasma/desktop/applets/tasks/windowtaskitem.cpp:120
#10 0x00007fc606ab6b7c in AbstractTaskItem::timerEvent (this=0x4535960, event=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/abstracttaskitem.cpp:439
#11 0x00007fc61eda0789 in QObject::event (this=0x4535960, e=<optimized out>) at kernel/qobject.cpp:1181
#12 0x00007fc61e75889b in QGraphicsWidget::event (this=0x4535960, event=0x7fff61868100) at graphicsview/qgraphicswidget.cpp:1455
#13 0x00007fc61e13a424 in notify_helper (e=0x7fff61868100, receiver=0x4535960, this=0xe7e9c0) at kernel/qapplication.cpp:4486
#14 QApplicationPrivate::notify_helper (this=0xe7e9c0, receiver=0x4535960, e=0x7fff61868100) at kernel/qapplication.cpp:4458
#15 0x00007fc61e13f291 in QApplication::notify (this=0xe5d6d0, receiver=0x4535960, e=0x7fff61868100) at kernel/qapplication.cpp:4365
#16 0x00007fc61fa38126 in KApplication::notify (this=0xe5d6d0, receiver=0x4535960, event=0x7fff61868100) at ../../kdeui/kernel/kapplication.cpp:311
#17 0x00007fc61ed89afc in QCoreApplication::notifyInternal (this=0xe5d6d0, receiver=0x4535960, event=0x7fff61868100) at kernel/qcoreapplication.cpp:787
#18 0x00007fc61edb6d62 in sendEvent (event=0x7fff61868100, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#19 QTimerInfoList::activateTimers (this=0xe819b0) at kernel/qeventdispatcher_unix.cpp:603
#20 0x00007fc61edb4538 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#21 idleTimerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:231
#22 0x00007fc61614da5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007fc61614e258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007fc61614e429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007fc61edb4ed6 in QEventDispatcherGlib::processEvents (this=0xdc0f40, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#26 0x00007fc61e1e207e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#27 0x00007fc61ed88cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#28 0x00007fc61ed88ef7 in QEventLoop::exec (this=0x7fff61868390, flags=...) at kernel/qeventloop.cpp:201
#29 0x00007fc61ed8d789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#30 0x00007fc621ece1a3 in kdemain (argc=1, argv=0x7fff61868778) at ../../../../plasma/desktop/shell/main.cpp:120
#31 0x00007fc621b0f30d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fff61868778, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff61868768) at libc-start.c:226
#32 0x0000000000400671 in _start ()

Possible duplicates by query: bug 286616, bug 286582, bug 286514, bug 286474, bug 286446.

Reported using DrKonqi