Application: plasma-desktop (0.4)
KDE Platform Version: 4.7.3 (4.7.3)
Qt Version: 4.7.4
Operating System: Linux 3.0.0-13-generic x86_64
Distribution: Ubuntu 11.10

-- Information about the crash:
- What I was doing when the application crashed: I was switching between Digikam and GIMP for editing a photo and switching to editing an ePub in Sigil.

The crash can be reproduced some of the time.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f28bbdaa7c0 (LWP 1672))]

Thread 4 (Thread 0x7f2898cdf700 (LWP 1673)):
#0  0x00007f28bb788773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f28afd12f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f28afd13429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f28b8979f3e in QEventDispatcherGlib::processEvents (this=0x2760a90, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007f28b894dcf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f28b894def7 in QEventLoop::exec (this=0x7f2898cded90, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007f28b886527f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007f28b8930cbf in QInotifyFileSystemWatcherEngine::run (this=0x275bd60) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f28b8867d05 in QThreadPrivate::start (arg=0x275bd60) at thread/qthread_unix.cpp:331
#9  0x00007f28b081fefc in start_thread (arg=0x7f2898cdf700) at pthread_create.c:304
#10 0x00007f28bb79489d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f28961ab700 (LWP 1674)):
#0  0x00007f28b0822034 in __pthread_mutex_lock (mutex=0x28958b8) at pthread_mutex_lock.c:61
#1  0x00007f28afd12023 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f28afd12dfd in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f28afd13429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f28b8979f3e in QEventDispatcherGlib::processEvents (this=0x288cf80, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#5  0x00007f28b894dcf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#6  0x00007f28b894def7 in QEventLoop::exec (this=0x7f28961aad90, flags=...) at kernel/qeventloop.cpp:201
#7  0x00007f28b886527f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#8  0x00007f28b8930cbf in QInotifyFileSystemWatcherEngine::run (this=0x2894d80) at io/qfilesystemwatcher_inotify.cpp:248
#9  0x00007f28b8867d05 in QThreadPrivate::start (arg=0x2894d80) at thread/qthread_unix.cpp:331
#10 0x00007f28b081fefc in start_thread (arg=0x7f28961ab700) at pthread_create.c:304
#11 0x00007f28bb79489d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f288ee76700 (LWP 1680)):
#0  0x00007f28bb788773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f28afd12f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f28afd13792 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f288f954516 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007f28afd382b6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f28b081fefc in start_thread (arg=0x7f288ee76700) at pthread_create.c:304
#6  0x00007f28bb79489d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f28bbdaa7c0 (LWP 1672)):
[KCrash Handler]
#6  isNull (this=0x0) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:568
#7  operator! (this=0x0) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:574
#8  TaskManager::TaskItem::task (this=0x25d8a90) at ../../../libs/taskmanager/taskitem.cpp:113
#9  0x00007f28a1892068 in WindowTaskItem::publishIconGeometry (this=0x447f3a0, rect=...) at ../../../../../plasma/desktop/applets/tasks/windowtaskitem.cpp:130
#10 0x00007f28a18a1d24 in TaskGroupItem::publishIconGeometry (this=<optimized out>, rect=...) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:1432
#11 0x00007f28a18a1aa5 in publishIconGeometry (this=0x4621fa0) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:1424
#12 TaskGroupItem::publishIconGeometry (this=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:1416
#13 0x00007f28a18a0b7c in AbstractTaskItem::timerEvent (this=0x4621fa0, event=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/abstracttaskitem.cpp:439
#14 0x00007f28b8965789 in QObject::event (this=0x4621fa0, e=<optimized out>) at kernel/qobject.cpp:1181
#15 0x00007f28b831d89b in QGraphicsWidget::event (this=0x4621fa0, event=0x7fff5a595b50) at graphicsview/qgraphicswidget.cpp:1455
#16 0x00007f28b7cff424 in notify_helper (e=0x7fff5a595b50, receiver=0x4621fa0, this=0x1e2e220) at kernel/qapplication.cpp:4486
#17 QApplicationPrivate::notify_helper (this=0x1e2e220, receiver=0x4621fa0, e=0x7fff5a595b50) at kernel/qapplication.cpp:4458
#18 0x00007f28b7d04291 in QApplication::notify (this=0x1e234f0, receiver=0x4621fa0, e=0x7fff5a595b50) at kernel/qapplication.cpp:4365
#19 0x00007f28b95fd126 in KApplication::notify (this=0x1e234f0, receiver=0x4621fa0, event=0x7fff5a595b50) at ../../kdeui/kernel/kapplication.cpp:311
#20 0x00007f28b894eafc in QCoreApplication::notifyInternal (this=0x1e234f0, receiver=0x4621fa0, event=0x7fff5a595b50) at kernel/qcoreapplication.cpp:787
#21 0x00007f28b897bd62 in sendEvent (event=0x7fff5a595b50, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#22 QTimerInfoList::activateTimers (this=0x1e2c980) at kernel/qeventdispatcher_unix.cpp:603
#23 0x00007f28b8979538 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#24 idleTimerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:231
#25 0x00007f28afd12a5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007f28afd13258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007f28afd13429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007f28b8979ed6 in QEventDispatcherGlib::processEvents (this=0x1daaf40, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#29 0x00007f28b7da707e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#30 0x00007f28b894dcf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#31 0x00007f28b894def7 in QEventLoop::exec (this=0x7fff5a595de0, flags=...) at kernel/qeventloop.cpp:201
#32 0x00007f28b8952789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#33 0x00007f28bba931a3 in kdemain (argc=1, argv=0x7fff5a5961c8) at ../../../../plasma/desktop/shell/main.cpp:120
#34 0x00007f28bb6d430d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fff5a5961c8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff5a5961b8) at libc-start.c:226
#35 0x0000000000400671 in _start ()

This bug may be a duplicate of or related to bug 286920.

Possible duplicates by query: bug 287611, bug 287588, bug 287545, bug 287512, bug 287489.

Reported using DrKonqi