Application: plasma-desktop (0.3)
KDE Platform Version: 4.4.2 (KDE 4.4.2)
Qt Version: 4.6.2
Operating System: Linux 2.6.31-20-generic x86_64
Distribution: Ubuntu 9.10

-- Information about the crash:
I wanted to increase the space of the task manager in the panel, so I decided to create a second panel dedicated to the task manager at the bottom and all the rest in a panel on top.
(moved original panel to top, new panel to bottom with new task manager)

After doing this, I already noticed some problems after my first reboot: Part of  the top panel was black. The date/time applet was unreadable (black on black).

So I decided to undo the changes.
Removed new bottom panel and moved original panel back to bottom.

I created a new panel on top to see if it would also become partially black. It didn't.
Then to gain back screen space, I tried to remove it.
That's when the crash occured.

Note:
Graphic card: Zotac GeForce GTX 260
Desktop effects were disabled.

When using desktop effects, my screen sometimes gets garbled or freezes completely after a while.
The logs contain messages similar to the following in such cases:
/var/log/kern.log.1:Apr 16 13:45:48 my-desktop kernel: [14491.078902] NVRM: Xid (0001:00): 13, 0001 00000000 00008397 0000194c 00000000 00000100

I also noticed parts of the bottom panel being black too sometimes. This changes as soon as I pass the mouse over it.
This wasn't the case this time with the black top panel.

I suppose the black parts are most likely an NVidia driver issue and unrelated to the crash, but I'm mentioning all this anyway, just in case.


 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
The current source language is "auto; currently c".
[KCrash Handler]
#5  0x00007f6dfae1d564 in QGraphicsItem::isPanel (this=0x2754c10) at graphicsview/qgraphicsitem.cpp:1661
#6  0x00007f6dfae6945c in QGraphicsScene::event (this=0x1c20670, event=0x7fffe0803140) at graphicsview/qgraphicsscene.cpp:3435
#7  0x00007f6dfa84412c in QApplicationPrivate::notify_helper (this=0x1b47820, receiver=0x1c20670, e=0x7fffe0803140) at kernel/qapplication.cpp:4300
#8  0x00007f6dfa84a71b in QApplication::notify (this=0x1b31250, receiver=0x1c20670, e=0x7fffe0803140) at kernel/qapplication.cpp:4183
#9  0x00007f6dfbbee076 in KApplication::notify (this=0x1b31250, receiver=0x1c20670, event=0x7fffe0803140) at ../../kdeui/kernel/kapplication.cpp:302
#10 0x00007f6dfb6a5e0c in QCoreApplication::notifyInternal (this=0x1b31250, receiver=0x1c20670, event=0x7fffe0803140) at kernel/qcoreapplication.cpp:704
#11 0x00007f6dfae806c8 in QGraphicsView::viewportEvent (this=0x23e3d40, event=0x7fffe0803140) at graphicsview/qgraphicsview.cpp:2718
#12 0x00007f6dfb6a5227 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=<value optimized out>, receiver=0x2407b60, event=0x7fffe0803140) at kernel/qcoreapplication.cpp:819
#13 0x00007f6dfa8440fc in QApplicationPrivate::notify_helper (this=0x1b47820, receiver=0x2407b60, e=0x7fffe0803140) at kernel/qapplication.cpp:4296
#14 0x00007f6dfa84a71b in QApplication::notify (this=0x1b31250, receiver=0x2407b60, e=0x7fffe0803140) at kernel/qapplication.cpp:4183
#15 0x00007f6dfbbee076 in KApplication::notify (this=0x1b31250, receiver=0x2407b60, event=0x7fffe0803140) at ../../kdeui/kernel/kapplication.cpp:302
#16 0x00007f6dfb6a5e0c in QCoreApplication::notifyInternal (this=0x1b31250, receiver=0x2407b60, event=0x7fffe0803140) at kernel/qcoreapplication.cpp:704
#17 0x00007f6dfa89a5fb in QCoreApplication::sendEvent (this=<value optimized out>, event=0x7fffe0803140) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#18 QWidget::event (this=<value optimized out>, event=0x7fffe0803140) at kernel/qwidget.cpp:8254
#19 0x00007f6dfac408b6 in QFrame::event (this=0x23e3d40, e=0x7fffe0803140) at widgets/qframe.cpp:557
#20 0x00007f6dfaccbd0b in QAbstractScrollArea::event (this=0x23e3d40, e=0x7fffe0803140) at widgets/qabstractscrollarea.cpp:989
#21 0x00007f6dfa84412c in QApplicationPrivate::notify_helper (this=0x1b47820, receiver=0x23e3d40, e=0x7fffe0803140) at kernel/qapplication.cpp:4300
#22 0x00007f6dfa84a71b in QApplication::notify (this=0x1b31250, receiver=0x23e3d40, e=0x7fffe0803140) at kernel/qapplication.cpp:4183
#23 0x00007f6dfbbee076 in KApplication::notify (this=0x1b31250, receiver=0x23e3d40, event=0x7fffe0803140) at ../../kdeui/kernel/kapplication.cpp:302
#24 0x00007f6dfb6a5e0c in QCoreApplication::notifyInternal (this=0x1b31250, receiver=0x23e3d40, event=0x7fffe0803140) at kernel/qcoreapplication.cpp:704
#25 0x00007f6dfa84dc7b in QCoreApplication::sendSpontaneousEvent (act=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#26 QApplication::setActiveWindow (act=<value optimized out>) at kernel/qapplication.cpp:2450
#27 0x00007f6dfa8c8d1e in QApplication::x11ProcessEvent (this=<value optimized out>, event=0x7fffe0803810) at kernel/qapplication_x11.cpp:3420
#28 0x00007f6dfa8f4322 in x11EventSourceDispatch (s=0x1b4ae70, callback=<value optimized out>, user_data=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:146
#29 0x00007f6df6abbbce in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#30 0x00007f6df6abf598 in ?? () from /lib/libglib-2.0.so.0
#31 0x00007f6df6abf6c0 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#32 0x00007f6dfb6cf333 in QEventDispatcherGlib::processEvents (this=0x1ac4770, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:412
#33 0x00007f6dfa8f3f0e in QGuiEventDispatcherGlib::processEvents (this=0x2754c10, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#34 0x00007f6dfb6a4732 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#35 0x00007f6dfb6a4b0c in QEventLoop::exec (this=0x7fffe0803b40, flags=) at kernel/qeventloop.cpp:201
#36 0x00007f6dfb6a884b in QCoreApplication::exec () at kernel/qcoreapplication.cpp:981
#37 0x00007f6defbe6fb2 in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#38 0x0000000000406fb8 in launch (argc=1, _name=<value optimized out>, args=<value optimized out>, cwd=<value optimized out>, envc=0, envs=<value optimized out>, reset_env=false, tty=0x0, 
    avoid_loops=false, startup_id_str=0x40a499 "0") at ../../kinit/kinit.cpp:717
#39 0x0000000000407c70 in handle_launcher_request (sock=9, who=<value optimized out>) at ../../kinit/kinit.cpp:1209
#40 0x0000000000408121 in handle_requests (waitForPid=0) at ../../kinit/kinit.cpp:1402
#41 0x0000000000408e02 in main (argc=4, argv=<value optimized out>, envp=<value optimized out>) at ../../kinit/kinit.cpp:1845

Possible duplicates by query: bug 232964, bug 231370, bug 231181, bug 230540, bug 230299.

Reported using DrKonqi