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 3.0.0-12-generic x86_64
Distribution: Ubuntu 11.10

-- Information about the crash:
- What I was doing when the application crashed:
I use Firefox and
Sometimes I turn off my computer
- Unusual behavior I noticed:
I'm a beginer Linux user

The crash can be reproduced some of the time.

-- Backtrace:
Application: Plazma asztali héj (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f12350537c0 (LWP 1924))]

Thread 4 (Thread 0x7f120fe86700 (LWP 1925)):
#0  0x00007f1229172045 in __GI_clock_gettime (clock_id=1, tp=0x7f120fe85a40) at ../sysdeps/unix/clock_gettime.c:94
#1  0x00007f1231a62074 in do_gettime (frac=0x7f120fe85a58, sec=0x7f120fe85a50) at tools/qelapsedtimer_unix.cpp:123
#2  qt_gettime () at tools/qelapsedtimer_unix.cpp:140
#3  0x00007f1231b246ed in QTimerInfoList::updateCurrentTime (this=0x21b2170) at kernel/qeventdispatcher_unix.cpp:339
#4  0x00007f1231b24a33 in QTimerInfoList::timerWait (this=0x21b2170, tm=...) at kernel/qeventdispatcher_unix.cpp:442
#5  0x00007f1231b2344c in timerSourcePrepareHelper (src=<optimized out>, timeout=0x7f120fe85b3c) at kernel/qeventdispatcher_glib.cpp:136
#6  0x00007f1231b234f5 in timerSourcePrepare (source=<optimized out>, timeout=<optimized out>) at kernel/qeventdispatcher_glib.cpp:169
#7  0x00007f1228ebbff2 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#8  0x00007f1228ebcdfd in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#9  0x00007f1228ebd429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#10 0x00007f1231b23f3e in QEventDispatcherGlib::processEvents (this=0x21b0d20, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#11 0x00007f1231af7cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#12 0x00007f1231af7ef7 in QEventLoop::exec (this=0x7f120fe85cd0, flags=...) at kernel/qeventloop.cpp:201
#13 0x00007f1231a0f27f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#14 0x00007f1231adacbf in QInotifyFileSystemWatcherEngine::run (this=0x21af5d0) at io/qfilesystemwatcher_inotify.cpp:248
#15 0x00007f1231a11d05 in QThreadPrivate::start (arg=0x21af5d0) at thread/qthread_unix.cpp:331
#16 0x00007f12261d656c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#17 0x00007f12299c9efc in start_thread (arg=0x7f120fe86700) at pthread_create.c:304
#18 0x00007f123493e89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#19 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f120d5dd700 (LWP 1926)):
#0  0x00007f12299cc034 in __pthread_mutex_lock (mutex=0x23cd448) at pthread_mutex_lock.c:61
#1  0x00007f1228ebc4ca in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f1228ebcf82 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f1228ebd429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f1231b23f3e in QEventDispatcherGlib::processEvents (this=0x23cd0a0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#5  0x00007f1231af7cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#6  0x00007f1231af7ef7 in QEventLoop::exec (this=0x7f120d5dccd0, flags=...) at kernel/qeventloop.cpp:201
#7  0x00007f1231a0f27f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#8  0x00007f1231adacbf in QInotifyFileSystemWatcherEngine::run (this=0x23cc5f0) at io/qfilesystemwatcher_inotify.cpp:248
#9  0x00007f1231a11d05 in QThreadPrivate::start (arg=0x23cc5f0) at thread/qthread_unix.cpp:331
#10 0x00007f12261d656c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#11 0x00007f12299c9efc in start_thread (arg=0x7f120d5dd700) at pthread_create.c:304
#12 0x00007f123493e89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#13 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f1206248700 (LWP 1932)):
#0  0x00007f1234932773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f1228ebcf68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f1228ebd792 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f1206d26516 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007f1228ee22b6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f12261d656c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#6  0x00007f12299c9efc in start_thread (arg=0x7f1206248700) at pthread_create.c:304
#7  0x00007f123493e89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#8  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f12350537c0 (LWP 1924)):
[KCrash Handler]
#6  isNull (this=0x4000400000018) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:568
#7  operator! (this=0x4000400000018) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:574
#8  TaskManager::TaskItem::task (this=0x3cb8430) at ../../../libs/taskmanager/taskitem.cpp:113
#9  0x00007f1219844112 in WindowTaskItem::publishIconGeometry (this=0x4076bd0) at ../../../../../plasma/desktop/applets/tasks/windowtaskitem.cpp:120
#10 0x00007f1219852b7c in AbstractTaskItem::timerEvent (this=0x4076bd0, event=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/abstracttaskitem.cpp:439
#11 0x00007f1231b0f789 in QObject::event (this=0x4076bd0, e=<optimized out>) at kernel/qobject.cpp:1181
#12 0x00007f12314c789b in QGraphicsWidget::event (this=0x4076bd0, event=0x7fff2bbc8c20) at graphicsview/qgraphicswidget.cpp:1455
#13 0x00007f1230ea9424 in notify_helper (e=0x7fff2bbc8c20, receiver=0x4076bd0, this=0x168f160) at kernel/qapplication.cpp:4486
#14 QApplicationPrivate::notify_helper (this=0x168f160, receiver=0x4076bd0, e=0x7fff2bbc8c20) at kernel/qapplication.cpp:4458
#15 0x00007f1230eae291 in QApplication::notify (this=0x16896c0, receiver=0x4076bd0, e=0x7fff2bbc8c20) at kernel/qapplication.cpp:4365
#16 0x00007f12327a7126 in KApplication::notify (this=0x16896c0, receiver=0x4076bd0, event=0x7fff2bbc8c20) at ../../kdeui/kernel/kapplication.cpp:311
#17 0x00007f1231af8afc in QCoreApplication::notifyInternal (this=0x16896c0, receiver=0x4076bd0, event=0x7fff2bbc8c20) at kernel/qcoreapplication.cpp:787
#18 0x00007f1231b25d62 in sendEvent (event=0x7fff2bbc8c20, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#19 QTimerInfoList::activateTimers (this=0x169d290) at kernel/qeventdispatcher_unix.cpp:603
#20 0x00007f1231b23538 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#21 idleTimerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:231
#22 0x00007f1228ebca5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007f1228ebd258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007f1228ebd429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007f1231b23ed6 in QEventDispatcherGlib::processEvents (this=0x15d1f40, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#26 0x00007f1230f5107e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#27 0x00007f1231af7cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#28 0x00007f1231af7ef7 in QEventLoop::exec (this=0x7fff2bbc8eb0, flags=...) at kernel/qeventloop.cpp:201
#29 0x00007f1231afc789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#30 0x00007f1234c3d1a3 in kdemain (argc=1, argv=0x7fff2bbc9298) at ../../../../plasma/desktop/shell/main.cpp:120
#31 0x00007f123487e30d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fff2bbc9298, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff2bbc9288) at libc-start.c:226
#32 0x0000000000400671 in _start ()

Possible duplicates by query: bug 291212, bug 291187, bug 291180, bug 291127, bug 291125.

Reported using DrKonqi