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:
I have saved one image.jpg from the Internetwith Mozilla-firefox Nightly 12.0a1

The crash can be reproduced some of the time.

-- Backtrace:
Application: Plasma-Desktop-Umgebung (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7fee2f1d27c0 (LWP 2496))]

Thread 3 (Thread 0x7fee01493700 (LWP 2498)):
#0  0x00007fee2305000b in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fee23050dfd in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fee23051429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fee2bcb7f3e in QEventDispatcherGlib::processEvents (this=0x29e09c0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007fee2bc8bcf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007fee2bc8bef7 in QEventLoop::exec (this=0x7fee01492cd0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007fee2bba327f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007fee2bc6ecbf in QInotifyFileSystemWatcherEngine::run (this=0x2a44740) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007fee2bba5d05 in QThreadPrivate::start (arg=0x2a44740) at thread/qthread_unix.cpp:331
#9  0x00007fee203692da in ?? () from /usr/lib/nvidia-current/libGL.so.1
#10 0x00007fee23b5defc in start_thread (arg=0x7fee01493700) at pthread_create.c:304
#11 0x00007fee2ead289d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fee00866700 (LWP 2499)):
#0  __pthread_mutex_unlock_usercnt (mutex=<optimized out>, decr=<optimized out>) at pthread_mutex_unlock.c:37
#1  __pthread_mutex_unlock (mutex=0x7fee23300828) at pthread_mutex_unlock.c:290
#2  0x00007fee23050f5c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fee23051429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fee2bcb7f3e in QEventDispatcherGlib::processEvents (this=0x2bb37e0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#5  0x00007fee2bc8bcf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#6  0x00007fee2bc8bef7 in QEventLoop::exec (this=0x7fee00865cd0, flags=...) at kernel/qeventloop.cpp:201
#7  0x00007fee2bba327f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#8  0x00007fee2bc6ecbf in QInotifyFileSystemWatcherEngine::run (this=0x2bbb730) at io/qfilesystemwatcher_inotify.cpp:248
#9  0x00007fee2bba5d05 in QThreadPrivate::start (arg=0x2bbb730) at thread/qthread_unix.cpp:331
#10 0x00007fee203692da in ?? () from /usr/lib/nvidia-current/libGL.so.1
#11 0x00007fee23b5defc in start_thread (arg=0x7fee00866700) at pthread_create.c:304
#12 0x00007fee2ead289d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#13 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fee2f1d27c0 (LWP 2496)):
[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=0x5cde870) at ../../../libs/taskmanager/taskitem.cpp:113
#9  0x00007fee13c94068 in WindowTaskItem::publishIconGeometry (this=0x466d1b0, rect=...) at ../../../../../plasma/desktop/applets/tasks/windowtaskitem.cpp:130
#10 0x00007fee13ca3d24 in TaskGroupItem::publishIconGeometry (this=<optimized out>, rect=...) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:1432
#11 0x00007fee13ca3aa5 in publishIconGeometry (this=0x38e2f60) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:1424
#12 TaskGroupItem::publishIconGeometry (this=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:1416
#13 0x00007fee13ca2b7c in AbstractTaskItem::timerEvent (this=0x38e2f60, event=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/abstracttaskitem.cpp:439
#14 0x00007fee2bca3789 in QObject::event (this=0x38e2f60, e=<optimized out>) at kernel/qobject.cpp:1181
#15 0x00007fee2b65b89b in QGraphicsWidget::event (this=0x38e2f60, event=0x7fff4232a850) at graphicsview/qgraphicswidget.cpp:1455
#16 0x00007fee2b03d424 in notify_helper (e=0x7fff4232a850, receiver=0x38e2f60, this=0x17d24a0) at kernel/qapplication.cpp:4486
#17 QApplicationPrivate::notify_helper (this=0x17d24a0, receiver=0x38e2f60, e=0x7fff4232a850) at kernel/qapplication.cpp:4458
#18 0x00007fee2b042291 in QApplication::notify (this=0x17d22e0, receiver=0x38e2f60, e=0x7fff4232a850) at kernel/qapplication.cpp:4365
#19 0x00007fee2c93b126 in KApplication::notify (this=0x17d22e0, receiver=0x38e2f60, event=0x7fff4232a850) at ../../kdeui/kernel/kapplication.cpp:311
#20 0x00007fee2bc8cafc in QCoreApplication::notifyInternal (this=0x17d22e0, receiver=0x38e2f60, event=0x7fff4232a850) at kernel/qcoreapplication.cpp:787
#21 0x00007fee2bcb9d62 in sendEvent (event=0x7fff4232a850, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#22 QTimerInfoList::activateTimers (this=0x17f18d0) at kernel/qeventdispatcher_unix.cpp:603
#23 0x00007fee2bcb7538 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#24 idleTimerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:231
#25 0x00007fee23050a5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007fee23051258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007fee23051429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007fee2bcb7ed6 in QEventDispatcherGlib::processEvents (this=0x1716f40, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#29 0x00007fee2b0e507e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#30 0x00007fee2bc8bcf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#31 0x00007fee2bc8bef7 in QEventLoop::exec (this=0x7fff4232aae0, flags=...) at kernel/qeventloop.cpp:201
#32 0x00007fee2bc90789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#33 0x00007fee2edd11a3 in kdemain (argc=1, argv=0x7fff4232aec8) at ../../../../plasma/desktop/shell/main.cpp:120
#34 0x00007fee2ea1230d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fff4232aec8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff4232aeb8) at libc-start.c:226
#35 0x0000000000400671 in _start ()

Possible duplicates by query: bug 292177, bug 292153, bug 292112, bug 292104, bug 292102.

Reported using DrKonqi