Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.5 (KDE 4.3.5)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-20-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
This crash happens about once an hour. I am usually using Thunderbird, Firefox, Konsole, Amarok and Kate, and the crashes seem to occur at random. The problem manifests itself first with the taskbar disappearing, then reappearing with a crash report and a superflous offer to restart the already-restrarted plasma desktop. Sorry I cannot offer more clues.
- Nicolas

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb785d700 (LWP 2804))]

Thread 2 (Thread 0xab73bb70 (LWP 2805)):
#0  0x00751422 in __kernel_vsyscall ()
#1  0x002d8e15 in pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/pthread_cond_wait.S:122
#2  0x0082b87d in __pthread_cond_wait (cond=0x8a7ddd0, mutex=0x8a7ddb8) at forward.c:139
#3  0x0091ae67 in QWaitConditionPrivate::wait (this=0x8a210b0, mutex=0x8a210ac, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  QWaitCondition::wait (this=0x8a210b0, mutex=0x8a210ac, time=4294967295) at thread/qwaitcondition_unix.cpp:159
#5  0x02662922 in QHostInfoAgent::run (this=0x8a210a0) at kernel/qhostinfo.cpp:260
#6  0x00919e32 in QThreadPrivate::start (arg=0x8a210a0) at thread/qthread_unix.cpp:188
#7  0x002d480e in start_thread (arg=0xab73bb70) at pthread_create.c:300
#8  0x0081e8de in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 1 (Thread 0xb785d700 (LWP 2804)):
[KCrash Handler]
#6  0x00bd5d57 in XVisualIDFromVisual () from /usr/lib/libX11.so.6
#7  0x0120f70e in qt_x11_getX11InfoForWindow (xinfo=0x8d14f7c, a=...) at kernel/qwidget_x11.cpp:400
#8  0x01216b4e in QWidgetPrivate::create_sys (this=0x8d14e88, window=29470802, initializeWindow=true, destroyOldWindow=true) at kernel/qwidget_x11.cpp:545
#9  0x011d7b1c in QWidget::create (this=0x8d14e68, window=29470802, initializeWindow=true, destroyOldWindow=<value optimized out>) at kernel/qwidget.cpp:1253
#10 0x07954c5e in ?? () from /usr/lib/kde4/plasma_applet_systemtray.so
#11 0x07950440 in ?? () from /usr/lib/kde4/plasma_applet_systemtray.so
#12 0x0795051b in ?? () from /usr/lib/kde4/plasma_applet_systemtray.so
#13 0x00a20263 in QMetaObject::activate (sender=0x8df83f8, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3113
#14 0x00a20ec2 in QMetaObject::activate (sender=0x8df83f8, m=0xafa908, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3187
#15 0x00a25387 in QSingleShotTimer::timeout (this=0x8df83f8) at .moc/release-shared/qtimer.moc:76
#16 0x00a2549c in QSingleShotTimer::timerEvent (this=0x8df83f8) at kernel/qtimer.cpp:298
#17 0x00a1a3bf in QObject::event (this=0x8df83f8, e=0xbfaf1780) at kernel/qobject.cpp:1075
#18 0x01180f54 in QApplicationPrivate::notify_helper (this=0x839a708, receiver=0x8df83f8, e=0xbfaf1780) at kernel/qapplication.cpp:4056
#19 0x0118867c in QApplication::notify (this=0x8373850, receiver=0x8df83f8, e=0xbfaf1780) at kernel/qapplication.cpp:3603
#20 0x01ed925a in KApplication::notify (this=0x8373850, receiver=0x8df83f8, event=0xbfaf1780) at ../../kdeui/kernel/kapplication.cpp:302
#21 0x00a0a6cb in QCoreApplication::notifyInternal (this=0x8373850, receiver=0x8df83f8, event=0xbfaf1780) at kernel/qcoreapplication.cpp:610
#22 0x00a377ce in QCoreApplication::sendEvent (this=0x839ce9c) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#23 QTimerInfoList::activateTimers (this=0x839ce9c) at kernel/qeventdispatcher_unix.cpp:572
#24 0x00a350e0 in timerSourceDispatch (source=0x839ce68) at kernel/qeventdispatcher_glib.cpp:165
#25 0x00250e88 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#26 0x00254730 in ?? () from /lib/libglib-2.0.so.0
#27 0x00254863 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#28 0x00a3502c in QEventDispatcherGlib::processEvents (this=0x839a4c8, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#29 0x01221be5 in QGuiEventDispatcherGlib::processEvents (this=0x839a4c8, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#30 0x00a08c79 in QEventLoop::processEvents (this=0xbfaf1a44, flags=) at kernel/qeventloop.cpp:149
#31 0x00a090ca in QEventLoop::exec (this=0xbfaf1a44, flags=...) at kernel/qeventloop.cpp:201
#32 0x00a0b53f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#33 0x01180dd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#34 0x069768ad in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#35 0x0804dde1 in launch (argc=<value optimized out>, _name=<value optimized out>, args=<value optimized out>, cwd=0x0, envc=0, envs=0x832cbc8 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x80511a5 "0") at ../../kinit/kinit.cpp:677
#36 0x0804ea35 in handle_launcher_request (sock=<value optimized out>, who=<value optimized out>) at ../../kinit/kinit.cpp:1169
#37 0x0804eeac in handle_requests (waitForPid=<value optimized out>) at ../../kinit/kinit.cpp:1362
#38 0x0804fbaf in main (argc=2, argv=0xbfaf22a4, envp=0xbfaf22b0) at ../../kinit/kinit.cpp:1793

This bug may be a duplicate of or related to bug 228369

Reported using DrKonqi