Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-19-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
Computer was idle at the time of the crash.

Had just been using Firefox and Calibre a lot before.

Recently ugraded to Karmic Koala to be able to support Calibre latest version.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb783e700 (LWP 1493))]

Thread 2 (Thread 0xac72ab70 (LWP 1494)):
#0  0x00a39422 in __kernel_vsyscall ()
#1  0x00735e15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x0066a87d in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0x00c39e67 in QWaitConditionPrivate::wait (this=0x8a9c440, mutex=0x8a9c43c, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  QWaitCondition::wait (this=0x8a9c440, mutex=0x8a9c43c, time=4294967295) at thread/qwaitcondition_unix.cpp:159
#5  0x080ed922 in QHostInfoAgent::run (this=0x8a9c430) at kernel/qhostinfo.cpp:260
#6  0x00c38e32 in QThreadPrivate::start (arg=0x8a9c430) at thread/qthread_unix.cpp:188
#7  0x0073180e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#8  0x0065d8de in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb783e700 (LWP 1493)):
[KCrash Handler]
#6  0x00137d57 in XVisualIDFromVisual () from /usr/lib/libX11.so.6
#7  0x057f670e in qt_x11_getX11InfoForWindow (xinfo=0x94c7474, a=...) at kernel/qwidget_x11.cpp:400
#8  0x057fdb4e in QWidgetPrivate::create_sys (this=0x94c7380, window=29443486, initializeWindow=true, destroyOldWindow=true) at kernel/qwidget_x11.cpp:545
#9  0x057beb1c in QWidget::create (this=0x9523d10, window=29443486, initializeWindow=true, destroyOldWindow=<value optimized out>) at kernel/qwidget.cpp:1253
#10 0x01fcbc1e in ?? () from /usr/lib/kde4/plasma_applet_systemtray.so
#11 0x01fc73f0 in ?? () from /usr/lib/kde4/plasma_applet_systemtray.so
#12 0x01fc74cb in ?? () from /usr/lib/kde4/plasma_applet_systemtray.so
#13 0x00d3f263 in QMetaObject::activate (sender=0x8f82dd8, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3113
#14 0x00d3fec2 in QMetaObject::activate (sender=0x8f82dd8, m=0xe19908, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3187
#15 0x00d44387 in QSingleShotTimer::timeout (this=0x8f82dd8) at .moc/release-shared/qtimer.moc:76
#16 0x00d4449c in QSingleShotTimer::timerEvent (this=0x8f82dd8) at kernel/qtimer.cpp:298
#17 0x00d393bf in QObject::event (this=0x8f82dd8, e=0xbfdce080) at kernel/qobject.cpp:1075
#18 0x05767f54 in QApplicationPrivate::notify_helper (this=0x86fe9b8, receiver=0x8f82dd8, e=0xbfdce080) at kernel/qapplication.cpp:4056
#19 0x0576f67c in QApplication::notify (this=0x86d7b28, receiver=0x8f82dd8, e=0xbfdce080) at kernel/qapplication.cpp:3603
#20 0x00fefbfa in KApplication::notify (this=0x86d7b28, receiver=0x8f82dd8, event=0xbfdce080) at ../../kdeui/kernel/kapplication.cpp:302
#21 0x00d296cb in QCoreApplication::notifyInternal (this=0x86d7b28, receiver=0x8f82dd8, event=0xbfdce080) at kernel/qcoreapplication.cpp:610
#22 0x00d567ce in QCoreApplication::sendEvent (this=0x8701384) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#23 QTimerInfoList::activateTimers (this=0x8701384) at kernel/qeventdispatcher_unix.cpp:572
#24 0x00d540e0 in timerSourceDispatch (source=0x8701350) at kernel/qeventdispatcher_glib.cpp:165
#25 0x00a72e88 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#26 0x00a76730 in ?? () from /lib/libglib-2.0.so.0
#27 0x00a76863 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#28 0x00d5402c in QEventDispatcherGlib::processEvents (this=0x86fe7a8, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#29 0x05808be5 in QGuiEventDispatcherGlib::processEvents (this=0x86fe7a8, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#30 0x00d27c79 in QEventLoop::processEvents (this=0xbfdce344, flags=) at kernel/qeventloop.cpp:149
#31 0x00d280ca in QEventLoop::exec (this=0xbfdce344, flags=...) at kernel/qeventloop.cpp:201
#32 0x00d2a53f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#33 0x05767dd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#34 0x0188080d 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=0x869d3b8 "", 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=0xbfdceba4, envp=0xbfdcebb0) at ../../kinit/kinit.cpp:1793

This bug may be a duplicate of or related to bug 226755

Reported using DrKonqi