Application: plasma-desktop (0.4)
KDE Platform Version: 4.7.2 (4.7.2)
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:
Right click on panel
select add widgets...
scroll to and select "System Tray"
drag "system Tray" widget to the panel
Panel Crash every time 100%

There is a check on "System Tray" widget as if it is already on a panel yet it does not visibly appear anywhere.

I am trying to add it because i removed it by accident.
I also get a crash when trying to open a default panel.

The crash can be reproduced every time.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f03d4c0e7c0 (LWP 1695))]

Thread 4 (Thread 0x7f03ae4d4700 (LWP 1698)):
#0  0x00007f03c9588088 in __pthread_getspecific (key=0) at pthread_getspecific.c:33
#1  0x00007f03d15ca08c in get_thread_data () at thread/qthread_unix.cpp:172
#2  QThreadData::current () at thread/qthread_unix.cpp:210
#3  0x00007f03d16dc6a9 in postEventSourcePrepare (s=0x1015f00, timeout=0x7f03ae4d3b3c) at kernel/qeventdispatcher_glib.cpp:254
#4  0x00007f03c8a74ff2 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f03c8a75dfd in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f03c8a76429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#7  0x00007f03d16dcf3e in QEventDispatcherGlib::processEvents (this=0x1015ee0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#8  0x00007f03d16b0cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#9  0x00007f03d16b0ef7 in QEventLoop::exec (this=0x7f03ae4d3cd0, flags=...) at kernel/qeventloop.cpp:201
#10 0x00007f03d15c827f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#11 0x00007f03d1693cbf in QInotifyFileSystemWatcherEngine::run (this=0x10151b0) at io/qfilesystemwatcher_inotify.cpp:248
#12 0x00007f03d15cad05 in QThreadPrivate::start (arg=0x10151b0) at thread/qthread_unix.cpp:331
#13 0x00007f03c5d8f56c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#14 0x00007f03c9582efc in start_thread (arg=0x7f03ae4d4700) at pthread_create.c:304
#15 0x00007f03d44f689d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#16 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f03ad8a7700 (LWP 1699)):
#0  0x00007f03d44ea773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f03c8a75f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f03c8a76429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f03d16dcf3e in QEventDispatcherGlib::processEvents (this=0x1471d60, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007f03d16b0cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f03d16b0ef7 in QEventLoop::exec (this=0x7f03ad8a6cd0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007f03d15c827f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007f03d1693cbf in QInotifyFileSystemWatcherEngine::run (this=0x1470070) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f03d15cad05 in QThreadPrivate::start (arg=0x1470070) at thread/qthread_unix.cpp:331
#9  0x00007f03c5d8f56c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#10 0x00007f03c9582efc in start_thread (arg=0x7f03ad8a7700) at pthread_create.c:304
#11 0x00007f03d44f689d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f03a683c700 (LWP 1705)):
#0  0x00007f03d44ea773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f03c8a75f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f03c8a76792 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f03a731a516 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007f03c8a9b2b6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f03c5d8f56c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#6  0x00007f03c9582efc in start_thread (arg=0x7f03a683c700) at pthread_create.c:304
#7  0x00007f03d44f689d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#8  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f03d4c0e7c0 (LWP 1695)):
[KCrash Handler]
#6  0x00007f03d1043734 in QGraphicsLayoutItem::isLayout (this=0x285be10) at graphicsview/qgraphicslayoutitem.cpp:868
#7  0x00007f03d10426e2 in QGraphicsLayoutPrivate::activateRecursive (this=0x2bc2d90, item=0x285be10) at graphicsview/qgraphicslayout_p.cpp:181
#8  0x00007f03d1042724 in QGraphicsLayoutPrivate::activateRecursive (this=0x2bc2d90, item=0x2df7420) at graphicsview/qgraphicslayout_p.cpp:194
#9  0x00007f03d10420db in QGraphicsLayout::activate (this=0x2df7420) at graphicsview/qgraphicslayout.cpp:261
#10 0x00007f03d1042199 in QGraphicsLayout::widgetEvent (this=0x2df7420, e=<optimized out>) at graphicsview/qgraphicslayout.cpp:389
#11 0x00007f03d108085a in QGraphicsWidget::event (this=<optimized out>, event=0x2b76300) at graphicsview/qgraphicswidget.cpp:1379
#12 0x00007f03d0a62424 in notify_helper (e=0x2b76300, receiver=0x29da6d0, this=0x811820) at kernel/qapplication.cpp:4486
#13 QApplicationPrivate::notify_helper (this=0x811820, receiver=0x29da6d0, e=0x2b76300) at kernel/qapplication.cpp:4458
#14 0x00007f03d0a67291 in QApplication::notify (this=0x801c50, receiver=0x29da6d0, e=0x2b76300) at kernel/qapplication.cpp:4365
#15 0x00007f03d2360126 in KApplication::notify (this=0x801c50, receiver=0x29da6d0, event=0x2b76300) at ../../kdeui/kernel/kapplication.cpp:311
#16 0x00007f03d16b1afc in QCoreApplication::notifyInternal (this=0x801c50, receiver=0x29da6d0, event=0x2b76300) at kernel/qcoreapplication.cpp:787
#17 0x00007f03d16b551f in sendEvent (event=0x2b76300, receiver=0x29da6d0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#18 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x75e430) at kernel/qcoreapplication.cpp:1428
#19 0x00007f03d16dca73 in sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:220
#20 postEventSourceDispatch (s=<optimized out>) at kernel/qeventdispatcher_glib.cpp:277
#21 0x00007f03c8a75a5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#22 0x00007f03c8a76258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007f03c8a76429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007f03d16dced6 in QEventDispatcherGlib::processEvents (this=0x75ff40, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#25 0x00007f03d0b0a07e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#26 0x00007f03d16b0cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#27 0x00007f03d16b0ef7 in QEventLoop::exec (this=0x7fff37a52130, flags=...) at kernel/qeventloop.cpp:201
#28 0x00007f03d16b5789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#29 0x00007f03d47f51a3 in kdemain (argc=1, argv=0x7fff37a52518) at ../../../../plasma/desktop/shell/main.cpp:120
#30 0x00007f03d443630d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fff37a52518, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff37a52508) at libc-start.c:226
#31 0x0000000000400671 in _start ()

Possible duplicates by query: bug 285193, bug 284550, bug 284392, bug 282758, bug 281595.

Reported using DrKonqi