Application: plasma-desktop (0.4)
KDE Platform Version: 4.7.2 (4.7.2) "release 5"
Qt Version: 4.7.4
Operating System: Linux 3.1.9-1.4-desktop x86_64
Distribution: "openSUSE 12.1 (x86_64)"

-- Information about the crash:
- What I was doing when the application crashed: Upon logging into KDE, the screen was empty, other than an Activities tab for adding widgets, which appeared at the upper right of the screen. Since it was the only thing present on the screen, I clicked the tab. It opened up a banner full of many different widgets that could be added.  scrolled from left to right in the banner, seeing what widgets it contained. I clicked the red X at the top right corner of the banner to close it. It did not close. Instead, the button with the red X remained in a pressed position, and the entire banner became unresponsive, but still remained on the screen. I right clicked the desktop to see what other options were present. A menu appeared, and I clicked Add Panel > Default Panel on the menu. Upon clicking Default Panel, the crash reporting software popped up, and the Default Panel never did appear.  The crash reporting application disappeared from view after about 5 seconds, so I right-clicked the desktop again, and selected Add Panel > Default Panel again. The Default Panel still did not ever appear, but the crash reporting software came back into view, exactly as it had previously been before disappearing from view. It again disappeared from view after approximately 10 seconds or so. Upon realizing that I could continue to make it come back into view by clicking Add Panel > Default Panel, I slowly and tediously completed the crash report in that manner. This is on an x86_64 openSUSE Linux 12.1 machine with an NVidia GeForce 550 TI card, using the NVidia driver provided by NVidia through NVidia's openSUSE 12.1 area of their repository. This exact same scenario also happened with my old video chip before upgrading; it was an Intel 715gl chip. With both setups, the exact same situation happened, and is very predictable over and over again. Nothing in my KDE seems to work right.

- Unusual behavior I noticed: Nothing present on the desktop other than an add activities tab upon login; I'm normally a GNOME user, so I don't know, maybe this is normal for KDE. The activiteis banner froze and would not close and was unresponsive. Windows continued to consistently disappear from view, but still be present, just not visible.

The crash can be reproduced every time.

-- Backtrace:
Application: Plasma Desktop Shell (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f51e9b33760 (LWP 2115))]

Thread 3 (Thread 0x7f51c562a700 (LWP 2123)):
#0  0x00007f51e841f11f in __pthread_mutex_unlock_usercnt () from /lib64/libpthread.so.0
#1  0x00007f51e3f9fb14 in g_main_context_prepare () from /usr/lib64/libglib-2.0.so.0
#2  0x00007f51e3fa092d in ?? () from /usr/lib64/libglib-2.0.so.0
#3  0x00007f51e3fa0f59 in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#4  0x00007f51e87bd586 in QEventDispatcherGlib::processEvents (this=0x7f51c00008e0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#5  0x00007f51e8791a32 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#6  0x00007f51e8791c2f in QEventLoop::exec (this=0x7f51c5629d30, flags=...) at kernel/qeventloop.cpp:201
#7  0x00007f51e86a95df in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#8  0x00007f51e8774aff in QInotifyFileSystemWatcherEngine::run (this=0x1087ef0) at io/qfilesystemwatcher_inotify.cpp:248
#9  0x00007f51e86ac025 in QThreadPrivate::start (arg=0x1087ef0) at thread/qthread_unix.cpp:331
#10 0x00007f51d97bf2da in ?? () from /usr/X11R6/lib64/libGL.so.1
#11 0x00007f51e841bf05 in start_thread () from /lib64/libpthread.so.0
#12 0x00007f51e71b510d in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7f51bcf28700 (LWP 2394)):
#0  0x00007f51e841fe6c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f51dd266852 in QTWTF::TCMalloc_PageHeap::scavengerThread (this=0x7f51dd55ee80) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#2  0x00007f51dd266889 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=<optimized out>) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#3  0x00007f51d97bf2da in ?? () from /usr/X11R6/lib64/libGL.so.1
#4  0x00007f51e841bf05 in start_thread () from /lib64/libpthread.so.0
#5  0x00007f51e71b510d in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7f51e9b33760 (LWP 2115)):
[KCrash Handler]
#6  0x00007f51e7f213c4 in QGraphicsLayoutItem::setParentLayoutItem (this=0x25081d0, parent=0x0) at graphicsview/qgraphicslayoutitem.cpp:856
#7  0x00007f51e7ef5984 in QGraphicsGridLayout::removeAt (this=0x24bf0d0, index=<optimized out>) at graphicsview/qgraphicsgridlayout.cpp:583
#8  0x00007f51cdaaa0f3 in ?? () from /usr/lib64/kde4/plasma_applet_systemtray.so
#9  0x00007f51cdaaa60c in ?? () from /usr/lib64/kde4/plasma_applet_systemtray.so
#10 0x00007f51e87a55aa in QMetaObject::activate (sender=0x2405710, m=<optimized out>, local_signal_index=<optimized out>, argv=0x0) at kernel/qobject.cpp:3287
#11 0x00007f51e87a8e89 in QObject::event (this=0x2405710, e=<optimized out>) at kernel/qobject.cpp:1190
#12 0x00007f51e7944c34 in notify_helper (e=0x7fff61487560, receiver=0x2405710, this=0x705710) at kernel/qapplication.cpp:4481
#13 QApplicationPrivate::notify_helper (this=0x705710, receiver=0x2405710, e=0x7fff61487560) at kernel/qapplication.cpp:4453
#14 0x00007f51e7949ac1 in QApplication::notify (this=0x6f8140, receiver=0x2405710, e=0x7fff61487560) at kernel/qapplication.cpp:4360
#15 0x00007f51e9524e36 in KApplication::notify(QObject*, QEvent*) () from /usr/lib64/libkdeui.so.5
#16 0x00007f51e879282c in QCoreApplication::notifyInternal (this=0x6f8140, receiver=0x2405710, event=0x7fff61487560) at kernel/qcoreapplication.cpp:787
#17 0x00007f51e87bf3a8 in sendEvent (event=0x7fff61487560, receiver=<optimized out>) at kernel/qcoreapplication.h:215
#18 QTimerInfoList::activateTimers (this=0x70a3b0) at kernel/qeventdispatcher_unix.cpp:618
#19 0x00007f51e87bcb94 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#20 0x00007f51e3fa058d in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#21 0x00007f51e3fa0d88 in ?? () from /usr/lib64/libglib-2.0.so.0
#22 0x00007f51e3fa0f59 in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#23 0x00007f51e87bd51f in QEventDispatcherGlib::processEvents (this=0x704e20, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#24 0x00007f51e79e7f9e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#25 0x00007f51e8791a32 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#26 0x00007f51e8791c2f in QEventLoop::exec (this=0x7fff61487860, flags=...) at kernel/qeventloop.cpp:201
#27 0x00007f51e8795df7 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#28 0x00007f51d52fe773 in kdemain () from /usr/lib64/libkdeinit4_plasma-desktop.so
#29 0x0000000000408897 in _start ()

Possible duplicates by query: bug 291336, bug 290465, bug 289385, bug 288804, bug 288096.

Reported using DrKonqi